linux-toradex.git/drivers/base, branch v5.14-rc2 Linux kernel for Apalis and Colibri modules Merge tag 'pm-5.14-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm 2021-07-07T20:22:59+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-07-07T20:22:59+00:00 aef4226f914016cc00affa8476ba5164dcca56fd Pull more power management updates from Rafael Wysocki: "These include cpufreq core simplifications and fixes, cpufreq driver updates, cpuidle driver update, a generic power domains (genpd) locking fix and a debug-related simplification of the PM core. Specifics: - Drop the ->stop_cpu() (not really useful) and ->resolve_freq() (unused) cpufreq driver callbacks and modify the users of the former accordingly (Viresh Kumar, Rafael Wysocki). - Add frequency invariance support to the ACPI CPPC cpufreq driver again along with the related fixes and cleanups (Viresh Kumar). - Update the Meditak, qcom and SCMI ARM cpufreq drivers (Fabien Parent, Seiya Wang, Sibi Sankar, Christophe JAILLET). - Rename black/white-lists in the DT cpufreq driver (Viresh Kumar). - Add generic performance domains support to the dvfs DT bindings (Sudeep Holla). - Refine locking in the generic power domains (genpd) support code to avoid lock dependency issues (Stephen Boyd). - Update the MSM and qcom ARM cpuidle drivers (Bartosz Dudziak). - Simplify the PM core debug code by using ktime_us_delta() to compute time interval lengths (Mark-PK Tsai)" * tag 'pm-5.14-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (21 commits) PM: domains: Shrink locking area of the gpd_list_lock PM: sleep: Use ktime_us_delta() in initcall_debug_report() cpufreq: CPPC: Add support for frequency invariance arch_topology: Avoid use-after-free for scale_freq_data cpufreq: CPPC: Pass structure instance by reference cpufreq: CPPC: Fix potential memleak in cppc_cpufreq_cpu_init cpufreq: Remove ->resolve_freq() cpufreq: Reuse cpufreq_driver_resolve_freq() in __cpufreq_driver_target() cpufreq: Remove the ->stop_cpu() driver callback cpufreq: powernv: Migrate to ->exit() callback instead of ->stop_cpu() cpufreq: CPPC: Migrate to ->exit() callback instead of ->stop_cpu() cpufreq: intel_pstate: Combine ->stop_cpu() and ->offline() cpuidle: qcom: Add SPM register data for MSM8226 dt-bindings: arm: msm: Add SAW2 for MSM8226 dt-bindings: cpufreq: update cpu type and clock name for MT8173 SoC clk: mediatek: remove deprecated CLK_INFRA_CA57SEL for MT8173 SoC cpufreq: dt: Rename black/white-lists cpufreq: scmi: Fix an error message cpufreq: mediatek: add support for mt8365 dt-bindings: dvfs: Add support for generic performance domains ... 
Pull more power management updates from Rafael Wysocki:
 "These include cpufreq core simplifications and fixes, cpufreq driver
  updates, cpuidle driver update, a generic power domains (genpd)
  locking fix and a debug-related simplification of the PM core.

  Specifics:

   - Drop the ->stop_cpu() (not really useful) and ->resolve_freq()
     (unused) cpufreq driver callbacks and modify the users of the
     former accordingly (Viresh Kumar, Rafael Wysocki).

   - Add frequency invariance support to the ACPI CPPC cpufreq driver
     again along with the related fixes and cleanups (Viresh Kumar).

   - Update the Meditak, qcom and SCMI ARM cpufreq drivers (Fabien
     Parent, Seiya Wang, Sibi Sankar, Christophe JAILLET).

   - Rename black/white-lists in the DT cpufreq driver (Viresh Kumar).

   - Add generic performance domains support to the dvfs DT bindings
     (Sudeep Holla).

   - Refine locking in the generic power domains (genpd) support code to
     avoid lock dependency issues (Stephen Boyd).

   - Update the MSM and qcom ARM cpuidle drivers (Bartosz Dudziak).

   - Simplify the PM core debug code by using ktime_us_delta() to
     compute time interval lengths (Mark-PK Tsai)"

* tag 'pm-5.14-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (21 commits)
  PM: domains: Shrink locking area of the gpd_list_lock
  PM: sleep: Use ktime_us_delta() in initcall_debug_report()
  cpufreq: CPPC: Add support for frequency invariance
  arch_topology: Avoid use-after-free for scale_freq_data
  cpufreq: CPPC: Pass structure instance by reference
  cpufreq: CPPC: Fix potential memleak in cppc_cpufreq_cpu_init
  cpufreq: Remove ->resolve_freq()
  cpufreq: Reuse cpufreq_driver_resolve_freq() in __cpufreq_driver_target()
  cpufreq: Remove the ->stop_cpu() driver callback
  cpufreq: powernv: Migrate to ->exit() callback instead of ->stop_cpu()
  cpufreq: CPPC: Migrate to ->exit() callback instead of ->stop_cpu()
  cpufreq: intel_pstate: Combine ->stop_cpu() and ->offline()
  cpuidle: qcom: Add SPM register data for MSM8226
  dt-bindings: arm: msm: Add SAW2 for MSM8226
  dt-bindings: cpufreq: update cpu type and clock name for MT8173 SoC
  clk: mediatek: remove deprecated CLK_INFRA_CA57SEL for MT8173 SoC
  cpufreq: dt: Rename black/white-lists
  cpufreq: scmi: Fix an error message
  cpufreq: mediatek: add support for mt8365
  dt-bindings: dvfs: Add support for generic performance domains
  ...
Merge branches 'pm-cpuidle', 'pm-sleep' and 'pm-domains' 2021-07-07T18:17:43+00:00 Rafael J. Wysocki rafael.j.wysocki@intel.com 2021-07-07T18:17:43+00:00 843372db2e3bf9694e98a1ff9d0da6dc3d53aab8 * pm-cpuidle: cpuidle: qcom: Add SPM register data for MSM8226 dt-bindings: arm: msm: Add SAW2 for MSM8226 * pm-sleep: PM: sleep: Use ktime_us_delta() in initcall_debug_report() * pm-domains: PM: domains: Shrink locking area of the gpd_list_lock 
* pm-cpuidle:
  cpuidle: qcom: Add SPM register data for MSM8226
  dt-bindings: arm: msm: Add SAW2 for MSM8226

* pm-sleep:
  PM: sleep: Use ktime_us_delta() in initcall_debug_report()

* pm-domains:
  PM: domains: Shrink locking area of the gpd_list_lock
Merge tag 'usb-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb 2021-07-05T21:16:22+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-07-05T21:16:22+00:00 79160a603bdb51916226caf4a6616cc4e1c58a58 Pull USB / Thunderbolt updates from Greg KH: "Here is the big set of USB and Thunderbolt patches for 5.14-rc1. Nothing major here just lots of little changes for new hardware and features. Highlights are: - more USB 4 support added to the thunderbolt core - build warning fixes all over the place - usb-serial driver updates and new device support - mtu3 driver updates - gadget driver updates - dwc3 driver updates - dwc2 driver updates - isp1760 host driver updates - musb driver updates - lots of other tiny things. Full details are in the shortlog. All of these have been in linux-next for a while now with no reported issues" * tag 'usb-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (223 commits) phy: qcom-qusb2: Add configuration for SM4250 and SM6115 dt-bindings: phy: qcom,qusb2: document sm4250/6115 compatible dt-bindings: usb: qcom,dwc3: Add bindings for sm6115/4250 USB: cdc-acm: blacklist Heimann USB Appset device usb: xhci-mtk: allow multiple Start-Split in a microframe usb: ftdi-elan: remove redundant continue statement in a while-loop usb: class: cdc-wdm: return the correct errno code xhci: remove redundant continue statement usb: dwc3: Fix debugfs creation flow usb: gadget: hid: fix error return code in hid_bind() usb: gadget: eem: fix echo command packet response issue usb: gadget: f_hid: fix endianness issue with descriptors Revert "USB: misc: Add onboard_usb_hub driver" Revert "of/platform: Add stubs for of_platform_device_create/destroy()" Revert "usb: host: xhci-plat: Create platform device for onboard hubs in probe()" Revert "arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub" xhci: solve a double free problem while doing s4 xhci: handle failed buffer copy to URB sg list and fix a W=1 copiler warning xhci: Add adaptive interrupt rate for isoch TRBs with XHCI_AVOID_BEI quirk xhci: Remove unused defines for ERST_SIZE and ERST_ENTRIES ... 
Pull USB / Thunderbolt updates from Greg KH:
 "Here is the big set of USB and Thunderbolt patches for 5.14-rc1.

  Nothing major here just lots of little changes for new hardware and
  features. Highlights are:

   - more USB 4 support added to the thunderbolt core

   - build warning fixes all over the place

   - usb-serial driver updates and new device support

   - mtu3 driver updates

   - gadget driver updates

   - dwc3 driver updates

   - dwc2 driver updates

   - isp1760 host driver updates

   - musb driver updates

   - lots of other tiny things.

  Full details are in the shortlog.

  All of these have been in linux-next for a while now with no reported
  issues"

* tag 'usb-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (223 commits)
  phy: qcom-qusb2: Add configuration for SM4250 and SM6115
  dt-bindings: phy: qcom,qusb2: document sm4250/6115 compatible
  dt-bindings: usb: qcom,dwc3: Add bindings for sm6115/4250
  USB: cdc-acm: blacklist Heimann USB Appset device
  usb: xhci-mtk: allow multiple Start-Split in a microframe
  usb: ftdi-elan: remove redundant continue statement in a while-loop
  usb: class: cdc-wdm: return the correct errno code
  xhci: remove redundant continue statement
  usb: dwc3: Fix debugfs creation flow
  usb: gadget: hid: fix error return code in hid_bind()
  usb: gadget: eem: fix echo command packet response issue
  usb: gadget: f_hid: fix endianness issue with descriptors
  Revert "USB: misc: Add onboard_usb_hub driver"
  Revert "of/platform: Add stubs for of_platform_device_create/destroy()"
  Revert "usb: host: xhci-plat: Create platform device for onboard hubs in probe()"
  Revert "arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub"
  xhci: solve a double free problem while doing s4
  xhci: handle failed buffer copy to URB sg list and fix a W=1 copiler warning
  xhci: Add adaptive interrupt rate for isoch TRBs with XHCI_AVOID_BEI quirk
  xhci: Remove unused defines for ERST_SIZE and ERST_ENTRIES
  ...
Merge tag 'driver-core-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core 2021-07-05T20:51:41+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-07-05T20:51:41+00:00 f5c13f1fdef9fed65b95c3c5f343d22c425ac1d7 Pull driver core changes from Greg KH: "Here is the small set of driver core and debugfs updates for 5.14-rc1. Included in here are: - debugfs api cleanups (touched some drivers) - devres updates - tiny driver core updates and tweaks Nothing major in here at all, and all have been in linux-next for a while with no reported issues" * tag 'driver-core-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (27 commits) docs: ABI: testing: sysfs-firmware-memmap: add some memmap types. devres: Enable trace events devres: No need to call remove_nodes() when there none present devres: Use list_for_each_safe_from() in remove_nodes() devres: Make locking straight forward in release_nodes() kernfs: move revalidate to be near lookup drivers/base: Constify static attribute_group structs firmware_loader: remove unneeded 'comma' macro devcoredump: remove contact information driver core: Drop helper devm_platform_ioremap_resource_wc() component: Rename 'dev' to 'parent' component: Drop 'dev' argument to component_match_realloc() device property: Don't check for NULL twice in the loops driver core: auxiliary bus: Fix typo in the docs drivers/base/node.c: make CACHE_ATTR define static DEVICE_ATTR_RO debugfs: remove return value of debugfs_create_ulong() debugfs: remove return value of debugfs_create_bool() scsi: snic: debugfs: remove local storage of debugfs files b43: don't save dentries for debugfs b43legacy: don't save dentries for debugfs ... 
Pull driver core changes from Greg KH:
 "Here is the small set of driver core and debugfs updates for 5.14-rc1.

  Included in here are:

   - debugfs api cleanups (touched some drivers)

   - devres updates

   - tiny driver core updates and tweaks

  Nothing major in here at all, and all have been in linux-next for a
  while with no reported issues"

* tag 'driver-core-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (27 commits)
  docs: ABI: testing: sysfs-firmware-memmap: add some memmap types.
  devres: Enable trace events
  devres: No need to call remove_nodes() when there none present
  devres: Use list_for_each_safe_from() in remove_nodes()
  devres: Make locking straight forward in release_nodes()
  kernfs: move revalidate to be near lookup
  drivers/base: Constify static attribute_group structs
  firmware_loader: remove unneeded 'comma' macro
  devcoredump: remove contact information
  driver core: Drop helper devm_platform_ioremap_resource_wc()
  component: Rename 'dev' to 'parent'
  component: Drop 'dev' argument to component_match_realloc()
  device property: Don't check for NULL twice in the loops
  driver core: auxiliary bus: Fix typo in the docs
  drivers/base/node.c: make CACHE_ATTR define static DEVICE_ATTR_RO
  debugfs: remove return value of debugfs_create_ulong()
  debugfs: remove return value of debugfs_create_bool()
  scsi: snic: debugfs: remove local storage of debugfs files
  b43: don't save dentries for debugfs
  b43legacy: don't save dentries for debugfs
  ...
PM: domains: Shrink locking area of the gpd_list_lock 2021-07-05T16:27:18+00:00 Stephen Boyd swboyd@chromium.org 2021-06-24T20:18:02+00:00 40ba55e40d0bd740fb1cb2b77c1630013536e440 On trogdor devices I see the following lockdep splat when stopping youtube with lockdep enabled in the kernel. ====================================================== WARNING: possible circular locking dependency detected 5.13.0-rc2 #71 Not tainted ------------------------------------------------------ ThreadPoolSingl/3969 is trying to acquire lock: ffffff80d4d5c080 (&inst->lock#3){+.+.}-{3:3}, at: vdec_buf_cleanup+0x3c/0x17c [venus_dec] but task is already holding lock: ffffff80d3c3c4f8 (&q->mmap_lock){+.+.}-{3:3}, at: vb2_core_reqbufs+0xe4/0x390 [videobuf2_common] which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&q->mmap_lock){+.+.}-{3:3}: __mutex_lock_common+0xcc/0xb88 mutex_lock_nested+0x5c/0x68 vb2_mmap+0xf4/0x290 [videobuf2_common] v4l2_m2m_fop_mmap+0x44/0x50 [v4l2_mem2mem] v4l2_mmap+0x5c/0xa4 mmap_region+0x310/0x5a4 do_mmap+0x348/0x43c vm_mmap_pgoff+0xfc/0x178 ksys_mmap_pgoff+0x84/0xfc __arm64_compat_sys_aarch32_mmap2+0x2c/0x38 invoke_syscall+0x54/0x110 el0_svc_common+0x88/0xf0 do_el0_svc_compat+0x28/0x34 el0_svc_compat+0x24/0x34 el0_sync_compat_handler+0xc0/0xf0 el0_sync_compat+0x19c/0x1c0 -> #4 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0x60/0x88 filldir64+0x124/0x3a0 dcache_readdir+0x7c/0x1ec iterate_dir+0xc4/0x184 __arm64_sys_getdents64+0x78/0x170 invoke_syscall+0x54/0x110 el0_svc_common+0xa8/0xf0 do_el0_svc_compat+0x28/0x34 el0_svc_compat+0x24/0x34 el0_sync_compat_handler+0xc0/0xf0 el0_sync_compat+0x19c/0x1c0 -> #3 (&sb->s_type->i_mutex_key#3){++++}-{3:3}: down_write+0x94/0x1f4 start_creating+0xb0/0x174 debugfs_create_dir+0x28/0x138 opp_debug_register+0x88/0xc0 _add_opp_dev+0x84/0x9c _add_opp_table_indexed+0x16c/0x310 _of_add_table_indexed+0x70/0xb5c dev_pm_opp_of_add_table_indexed+0x20/0x2c of_genpd_add_provider_onecell+0xc4/0x1c8 rpmhpd_probe+0x21c/0x278 platform_probe+0xb4/0xd4 really_probe+0x140/0x35c driver_probe_device+0x90/0xcc __device_attach_driver+0xa4/0xc0 bus_for_each_drv+0x8c/0xd8 __device_attach+0xc4/0x150 device_initial_probe+0x20/0x2c bus_probe_device+0x40/0xa4 device_add+0x22c/0x3fc of_device_add+0x44/0x54 of_platform_device_create_pdata+0xb0/0xf4 of_platform_bus_create+0x1d0/0x350 of_platform_populate+0x80/0xd4 devm_of_platform_populate+0x64/0xb0 rpmh_rsc_probe+0x378/0x3dc platform_probe+0xb4/0xd4 really_probe+0x140/0x35c driver_probe_device+0x90/0xcc __device_attach_driver+0xa4/0xc0 bus_for_each_drv+0x8c/0xd8 __device_attach+0xc4/0x150 device_initial_probe+0x20/0x2c bus_probe_device+0x40/0xa4 device_add+0x22c/0x3fc of_device_add+0x44/0x54 of_platform_device_create_pdata+0xb0/0xf4 of_platform_bus_create+0x1d0/0x350 of_platform_bus_create+0x21c/0x350 of_platform_populate+0x80/0xd4 of_platform_default_populate_init+0xb8/0xd4 do_one_initcall+0x1b4/0x400 do_initcall_level+0xa8/0xc8 do_initcalls+0x5c/0x9c do_basic_setup+0x2c/0x38 kernel_init_freeable+0x1a4/0x1ec kernel_init+0x20/0x118 ret_from_fork+0x10/0x30 -> #2 (gpd_list_lock){+.+.}-{3:3}: __mutex_lock_common+0xcc/0xb88 mutex_lock_nested+0x5c/0x68 __genpd_dev_pm_attach+0x70/0x18c genpd_dev_pm_attach_by_id+0xe4/0x158 genpd_dev_pm_attach_by_name+0x48/0x60 dev_pm_domain_attach_by_name+0x2c/0x38 dev_pm_opp_attach_genpd+0xac/0x160 vcodec_domains_get+0x94/0x14c [venus_core] core_get_v4+0x150/0x188 [venus_core] venus_probe+0x138/0x444 [venus_core] platform_probe+0xb4/0xd4 really_probe+0x140/0x35c driver_probe_device+0x90/0xcc device_driver_attach+0x58/0x7c __driver_attach+0xc8/0xe0 bus_for_each_dev+0x88/0xd4 driver_attach+0x30/0x3c bus_add_driver+0x10c/0x1e0 driver_register+0x70/0x108 __platform_driver_register+0x30/0x3c 0xffffffde113e1044 do_one_initcall+0x1b4/0x400 do_init_module+0x64/0x1fc load_module+0x17f4/0x1958 __arm64_sys_finit_module+0xb4/0xf0 invoke_syscall+0x54/0x110 el0_svc_common+0x88/0xf0 do_el0_svc_compat+0x28/0x34 el0_svc_compat+0x24/0x34 el0_sync_compat_handler+0xc0/0xf0 el0_sync_compat+0x19c/0x1c0 -> #1 (&opp_table->genpd_virt_dev_lock){+.+.}-{3:3}: __mutex_lock_common+0xcc/0xb88 mutex_lock_nested+0x5c/0x68 _set_required_opps+0x74/0x120 _set_opp+0x94/0x37c dev_pm_opp_set_rate+0xa0/0x194 core_clks_set_rate+0x28/0x58 [venus_core] load_scale_v4+0x228/0x2b4 [venus_core] session_process_buf+0x160/0x198 [venus_core] venus_helper_vb2_buf_queue+0xcc/0x130 [venus_core] vdec_vb2_buf_queue+0xc4/0x140 [venus_dec] __enqueue_in_driver+0x164/0x188 [videobuf2_common] vb2_core_qbuf+0x13c/0x47c [videobuf2_common] vb2_qbuf+0x88/0xec [videobuf2_v4l2] v4l2_m2m_qbuf+0x84/0x15c [v4l2_mem2mem] v4l2_m2m_ioctl_qbuf+0x24/0x30 [v4l2_mem2mem] v4l_qbuf+0x54/0x68 __video_do_ioctl+0x2bc/0x3bc video_usercopy+0x558/0xb04 video_ioctl2+0x24/0x30 v4l2_ioctl+0x58/0x68 v4l2_compat_ioctl32+0x84/0xa0 __arm64_compat_sys_ioctl+0x12c/0x140 invoke_syscall+0x54/0x110 el0_svc_common+0x88/0xf0 do_el0_svc_compat+0x28/0x34 el0_svc_compat+0x24/0x34 el0_sync_compat_handler+0xc0/0xf0 el0_sync_compat+0x19c/0x1c0 -> #0 (&inst->lock#3){+.+.}-{3:3}: __lock_acquire+0x248c/0x2d6c lock_acquire+0x240/0x314 __mutex_lock_common+0xcc/0xb88 mutex_lock_nested+0x5c/0x68 vdec_buf_cleanup+0x3c/0x17c [venus_dec] __vb2_queue_free+0x98/0x204 [videobuf2_common] vb2_core_reqbufs+0x14c/0x390 [videobuf2_common] vb2_reqbufs+0x58/0x74 [videobuf2_v4l2] v4l2_m2m_reqbufs+0x58/0x90 [v4l2_mem2mem] v4l2_m2m_ioctl_reqbufs+0x24/0x30 [v4l2_mem2mem] v4l_reqbufs+0x58/0x6c __video_do_ioctl+0x2bc/0x3bc video_usercopy+0x558/0xb04 video_ioctl2+0x24/0x30 v4l2_ioctl+0x58/0x68 v4l2_compat_ioctl32+0x84/0xa0 __arm64_compat_sys_ioctl+0x12c/0x140 invoke_syscall+0x54/0x110 el0_svc_common+0x88/0xf0 do_el0_svc_compat+0x28/0x34 el0_svc_compat+0x24/0x34 el0_sync_compat_handler+0xc0/0xf0 el0_sync_compat+0x19c/0x1c0 other info that might help us debug this: Chain exists of: &inst->lock#3 --> &mm->mmap_lock --> &q->mmap_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&q->mmap_lock); lock(&mm->mmap_lock); lock(&q->mmap_lock); lock(&inst->lock#3); *** DEADLOCK *** 1 lock held by ThreadPoolSingl/3969: #0: ffffff80d3c3c4f8 (&q->mmap_lock){+.+.}-{3:3}, at: vb2_core_reqbufs+0xe4/0x390 [videobuf2_common] stack backtrace: CPU: 2 PID: 3969 Comm: ThreadPoolSingl Not tainted 5.13.0-rc2 #71 Hardware name: Google Lazor (rev3+) with KB Backlight (DT) Call trace: dump_backtrace+0x0/0x1b4 show_stack+0x24/0x30 dump_stack+0xe0/0x15c print_circular_bug+0x32c/0x388 check_noncircular+0x138/0x140 __lock_acquire+0x248c/0x2d6c lock_acquire+0x240/0x314 __mutex_lock_common+0xcc/0xb88 mutex_lock_nested+0x5c/0x68 vdec_buf_cleanup+0x3c/0x17c [venus_dec] __vb2_queue_free+0x98/0x204 [videobuf2_common] vb2_core_reqbufs+0x14c/0x390 [videobuf2_common] vb2_reqbufs+0x58/0x74 [videobuf2_v4l2] v4l2_m2m_reqbufs+0x58/0x90 [v4l2_mem2mem] v4l2_m2m_ioctl_reqbufs+0x24/0x30 [v4l2_mem2mem] v4l_reqbufs+0x58/0x6c __video_do_ioctl+0x2bc/0x3bc video_usercopy+0x558/0xb04 video_ioctl2+0x24/0x30 v4l2_ioctl+0x58/0x68 v4l2_compat_ioctl32+0x84/0xa0 __arm64_compat_sys_ioctl+0x12c/0x140 invoke_syscall+0x54/0x110 el0_svc_common+0x88/0xf0 do_el0_svc_compat+0x28/0x34 el0_svc_compat+0x24/0x34 el0_sync_compat_handler+0xc0/0xf0 el0_sync_compat+0x19c/0x1c0 The 'gpd_list_lock' is nominally named as such to protect the 'gpd_list' from concurrent access and mutation. Unfortunately, holding that mutex around various OPP framework calls leads to lockdep splats because now we're doing various operations in OPP core such as registering with debugfs while holding the list lock. We don't need to hold any list mutex while we're calling into OPP, so let's shrink the locking area of the 'gpd_list_lock' so that lockdep isn't triggered. This also helps reduce contention on this lock, which probably doesn't matter much but at least is nice to have. Cc: Len Brown <len.brown@intel.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: <linux-pm@vger.kernel.org> Cc: Viresh Kumar <vireshk@kernel.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 
On trogdor devices I see the following lockdep splat when stopping
youtube with lockdep enabled in the kernel.

 ======================================================
 WARNING: possible circular locking dependency detected
 5.13.0-rc2 #71 Not tainted
 ------------------------------------------------------
 ThreadPoolSingl/3969 is trying to acquire lock:
 ffffff80d4d5c080 (&inst->lock#3){+.+.}-{3:3}, at: vdec_buf_cleanup+0x3c/0x17c [venus_dec]

 but task is already holding lock:
 ffffff80d3c3c4f8 (&q->mmap_lock){+.+.}-{3:3}, at: vb2_core_reqbufs+0xe4/0x390 [videobuf2_common]

 which lock already depends on the new lock.

 the existing dependency chain (in reverse order) is:

 -> #5 (&q->mmap_lock){+.+.}-{3:3}:
        __mutex_lock_common+0xcc/0xb88
        mutex_lock_nested+0x5c/0x68
        vb2_mmap+0xf4/0x290 [videobuf2_common]
        v4l2_m2m_fop_mmap+0x44/0x50 [v4l2_mem2mem]
        v4l2_mmap+0x5c/0xa4
        mmap_region+0x310/0x5a4
        do_mmap+0x348/0x43c
        vm_mmap_pgoff+0xfc/0x178
        ksys_mmap_pgoff+0x84/0xfc
        __arm64_compat_sys_aarch32_mmap2+0x2c/0x38
        invoke_syscall+0x54/0x110
        el0_svc_common+0x88/0xf0
        do_el0_svc_compat+0x28/0x34
        el0_svc_compat+0x24/0x34
        el0_sync_compat_handler+0xc0/0xf0
        el0_sync_compat+0x19c/0x1c0

 -> #4 (&mm->mmap_lock){++++}-{3:3}:
        __might_fault+0x60/0x88
        filldir64+0x124/0x3a0
        dcache_readdir+0x7c/0x1ec
        iterate_dir+0xc4/0x184
        __arm64_sys_getdents64+0x78/0x170
        invoke_syscall+0x54/0x110
        el0_svc_common+0xa8/0xf0
        do_el0_svc_compat+0x28/0x34
        el0_svc_compat+0x24/0x34
        el0_sync_compat_handler+0xc0/0xf0
        el0_sync_compat+0x19c/0x1c0

 -> #3 (&sb->s_type->i_mutex_key#3){++++}-{3:3}:
        down_write+0x94/0x1f4
        start_creating+0xb0/0x174
        debugfs_create_dir+0x28/0x138
        opp_debug_register+0x88/0xc0
        _add_opp_dev+0x84/0x9c
        _add_opp_table_indexed+0x16c/0x310
        _of_add_table_indexed+0x70/0xb5c
        dev_pm_opp_of_add_table_indexed+0x20/0x2c
        of_genpd_add_provider_onecell+0xc4/0x1c8
        rpmhpd_probe+0x21c/0x278
        platform_probe+0xb4/0xd4
        really_probe+0x140/0x35c
        driver_probe_device+0x90/0xcc
        __device_attach_driver+0xa4/0xc0
        bus_for_each_drv+0x8c/0xd8
        __device_attach+0xc4/0x150
        device_initial_probe+0x20/0x2c
        bus_probe_device+0x40/0xa4
        device_add+0x22c/0x3fc
        of_device_add+0x44/0x54
        of_platform_device_create_pdata+0xb0/0xf4
        of_platform_bus_create+0x1d0/0x350
        of_platform_populate+0x80/0xd4
        devm_of_platform_populate+0x64/0xb0
        rpmh_rsc_probe+0x378/0x3dc
        platform_probe+0xb4/0xd4
        really_probe+0x140/0x35c
        driver_probe_device+0x90/0xcc
        __device_attach_driver+0xa4/0xc0
        bus_for_each_drv+0x8c/0xd8
        __device_attach+0xc4/0x150
        device_initial_probe+0x20/0x2c
        bus_probe_device+0x40/0xa4
        device_add+0x22c/0x3fc
        of_device_add+0x44/0x54
        of_platform_device_create_pdata+0xb0/0xf4
        of_platform_bus_create+0x1d0/0x350
        of_platform_bus_create+0x21c/0x350
        of_platform_populate+0x80/0xd4
        of_platform_default_populate_init+0xb8/0xd4
        do_one_initcall+0x1b4/0x400
        do_initcall_level+0xa8/0xc8
        do_initcalls+0x5c/0x9c
        do_basic_setup+0x2c/0x38
        kernel_init_freeable+0x1a4/0x1ec
        kernel_init+0x20/0x118
        ret_from_fork+0x10/0x30

 -> #2 (gpd_list_lock){+.+.}-{3:3}:
        __mutex_lock_common+0xcc/0xb88
        mutex_lock_nested+0x5c/0x68
        __genpd_dev_pm_attach+0x70/0x18c
        genpd_dev_pm_attach_by_id+0xe4/0x158
        genpd_dev_pm_attach_by_name+0x48/0x60
        dev_pm_domain_attach_by_name+0x2c/0x38
        dev_pm_opp_attach_genpd+0xac/0x160
        vcodec_domains_get+0x94/0x14c [venus_core]
        core_get_v4+0x150/0x188 [venus_core]
        venus_probe+0x138/0x444 [venus_core]
        platform_probe+0xb4/0xd4
        really_probe+0x140/0x35c
        driver_probe_device+0x90/0xcc
        device_driver_attach+0x58/0x7c
        __driver_attach+0xc8/0xe0
        bus_for_each_dev+0x88/0xd4
        driver_attach+0x30/0x3c
        bus_add_driver+0x10c/0x1e0
        driver_register+0x70/0x108
        __platform_driver_register+0x30/0x3c
        0xffffffde113e1044
        do_one_initcall+0x1b4/0x400
        do_init_module+0x64/0x1fc
        load_module+0x17f4/0x1958
        __arm64_sys_finit_module+0xb4/0xf0
        invoke_syscall+0x54/0x110
        el0_svc_common+0x88/0xf0
        do_el0_svc_compat+0x28/0x34
        el0_svc_compat+0x24/0x34
        el0_sync_compat_handler+0xc0/0xf0
        el0_sync_compat+0x19c/0x1c0

 -> #1 (&opp_table->genpd_virt_dev_lock){+.+.}-{3:3}:
        __mutex_lock_common+0xcc/0xb88
        mutex_lock_nested+0x5c/0x68
        _set_required_opps+0x74/0x120
        _set_opp+0x94/0x37c
        dev_pm_opp_set_rate+0xa0/0x194
        core_clks_set_rate+0x28/0x58 [venus_core]
        load_scale_v4+0x228/0x2b4 [venus_core]
        session_process_buf+0x160/0x198 [venus_core]
        venus_helper_vb2_buf_queue+0xcc/0x130 [venus_core]
        vdec_vb2_buf_queue+0xc4/0x140 [venus_dec]
        __enqueue_in_driver+0x164/0x188 [videobuf2_common]
        vb2_core_qbuf+0x13c/0x47c [videobuf2_common]
        vb2_qbuf+0x88/0xec [videobuf2_v4l2]
        v4l2_m2m_qbuf+0x84/0x15c [v4l2_mem2mem]
        v4l2_m2m_ioctl_qbuf+0x24/0x30 [v4l2_mem2mem]
        v4l_qbuf+0x54/0x68
        __video_do_ioctl+0x2bc/0x3bc
        video_usercopy+0x558/0xb04
        video_ioctl2+0x24/0x30
        v4l2_ioctl+0x58/0x68
        v4l2_compat_ioctl32+0x84/0xa0
        __arm64_compat_sys_ioctl+0x12c/0x140
        invoke_syscall+0x54/0x110
        el0_svc_common+0x88/0xf0
        do_el0_svc_compat+0x28/0x34
        el0_svc_compat+0x24/0x34
        el0_sync_compat_handler+0xc0/0xf0
        el0_sync_compat+0x19c/0x1c0

 -> #0 (&inst->lock#3){+.+.}-{3:3}:
        __lock_acquire+0x248c/0x2d6c
        lock_acquire+0x240/0x314
        __mutex_lock_common+0xcc/0xb88
        mutex_lock_nested+0x5c/0x68
        vdec_buf_cleanup+0x3c/0x17c [venus_dec]
        __vb2_queue_free+0x98/0x204 [videobuf2_common]
        vb2_core_reqbufs+0x14c/0x390 [videobuf2_common]
        vb2_reqbufs+0x58/0x74 [videobuf2_v4l2]
        v4l2_m2m_reqbufs+0x58/0x90 [v4l2_mem2mem]
        v4l2_m2m_ioctl_reqbufs+0x24/0x30 [v4l2_mem2mem]
        v4l_reqbufs+0x58/0x6c
        __video_do_ioctl+0x2bc/0x3bc
        video_usercopy+0x558/0xb04
        video_ioctl2+0x24/0x30
        v4l2_ioctl+0x58/0x68
        v4l2_compat_ioctl32+0x84/0xa0
        __arm64_compat_sys_ioctl+0x12c/0x140
        invoke_syscall+0x54/0x110
        el0_svc_common+0x88/0xf0
        do_el0_svc_compat+0x28/0x34
        el0_svc_compat+0x24/0x34
        el0_sync_compat_handler+0xc0/0xf0
        el0_sync_compat+0x19c/0x1c0

 other info that might help us debug this:

 Chain exists of:
   &inst->lock#3 --> &mm->mmap_lock --> &q->mmap_lock

  Possible unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
   lock(&q->mmap_lock);
                                lock(&mm->mmap_lock);
                                lock(&q->mmap_lock);
   lock(&inst->lock#3);

  *** DEADLOCK ***

 1 lock held by ThreadPoolSingl/3969:
  #0: ffffff80d3c3c4f8 (&q->mmap_lock){+.+.}-{3:3}, at: vb2_core_reqbufs+0xe4/0x390 [videobuf2_common]

 stack backtrace:
 CPU: 2 PID: 3969 Comm: ThreadPoolSingl Not tainted 5.13.0-rc2 #71
 Hardware name: Google Lazor (rev3+) with KB Backlight (DT)
 Call trace:
  dump_backtrace+0x0/0x1b4
  show_stack+0x24/0x30
  dump_stack+0xe0/0x15c
  print_circular_bug+0x32c/0x388
  check_noncircular+0x138/0x140
  __lock_acquire+0x248c/0x2d6c
  lock_acquire+0x240/0x314
  __mutex_lock_common+0xcc/0xb88
  mutex_lock_nested+0x5c/0x68
  vdec_buf_cleanup+0x3c/0x17c [venus_dec]
  __vb2_queue_free+0x98/0x204 [videobuf2_common]
  vb2_core_reqbufs+0x14c/0x390 [videobuf2_common]
  vb2_reqbufs+0x58/0x74 [videobuf2_v4l2]
  v4l2_m2m_reqbufs+0x58/0x90 [v4l2_mem2mem]
  v4l2_m2m_ioctl_reqbufs+0x24/0x30 [v4l2_mem2mem]
  v4l_reqbufs+0x58/0x6c
  __video_do_ioctl+0x2bc/0x3bc
  video_usercopy+0x558/0xb04
  video_ioctl2+0x24/0x30
  v4l2_ioctl+0x58/0x68
  v4l2_compat_ioctl32+0x84/0xa0
  __arm64_compat_sys_ioctl+0x12c/0x140
  invoke_syscall+0x54/0x110
  el0_svc_common+0x88/0xf0
  do_el0_svc_compat+0x28/0x34
  el0_svc_compat+0x24/0x34
  el0_sync_compat_handler+0xc0/0xf0
  el0_sync_compat+0x19c/0x1c0

The 'gpd_list_lock' is nominally named as such to protect the 'gpd_list'
from concurrent access and mutation. Unfortunately, holding that mutex
around various OPP framework calls leads to lockdep splats because now
we're doing various operations in OPP core such as registering with
debugfs while holding the list lock. We don't need to hold any list
mutex while we're calling into OPP, so let's shrink the locking area of
the 'gpd_list_lock' so that lockdep isn't triggered. This also helps
reduce contention on this lock, which probably doesn't matter much but
at least is nice to have.

Cc: Len Brown <len.brown@intel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <linux-pm@vger.kernel.org>
Cc: Viresh Kumar <vireshk@kernel.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Merge tag 'vfio-v5.14-rc1' of git://github.com/awilliam/linux-vfio 2021-07-03T18:49:33+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-07-03T18:49:33+00:00 8e8d9442d1139d05d0c3b83efa34c4b7693d2969 Pull VFIO updates from Alex Williamson: - Module reference fixes, structure renaming (Max Gurtovoy) - Export and use common pci_dev_trylock() (Luis Chamberlain) - Enable direct mdev device creation and probing by parent (Christoph Hellwig & Jason Gunthorpe) - Fix mdpy error path leak (Colin Ian King) - Fix mtty list entry leak (Jason Gunthorpe) - Enforce mtty device limit (Alex Williamson) - Resolve concurrent vfio-pci mmap faults (Alex Williamson) * tag 'vfio-v5.14-rc1' of git://github.com/awilliam/linux-vfio: vfio/pci: Handle concurrent vma faults vfio/mtty: Enforce available_instances vfio/mtty: Delete mdev_devices_list vfio: use the new pci_dev_trylock() helper to simplify try lock PCI: Export pci_dev_trylock() and pci_dev_unlock() vfio/mdpy: Fix memory leak of object mdev_state->vconfig vfio/iommu_type1: rename vfio_group struck to vfio_iommu_group vfio/mbochs: Convert to use vfio_register_group_dev() vfio/mdpy: Convert to use vfio_register_group_dev() vfio/mtty: Convert to use vfio_register_group_dev() vfio/mdev: Allow the mdev_parent_ops to specify the device driver to bind vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE driver core: Export device_driver_attach() driver core: Don't return EPROBE_DEFER to userspace during sysfs bind driver core: Flow the return code from ->probe() through to sysfs bind driver core: Better distinguish probe errors in really_probe driver core: Pull required checks into driver_probe_device() vfio/platform: remove unneeded parent_module attribute vfio: centralize module refcount in subsystem layer 
Pull VFIO updates from Alex Williamson:

 - Module reference fixes, structure renaming (Max Gurtovoy)

 - Export and use common pci_dev_trylock() (Luis Chamberlain)

 - Enable direct mdev device creation and probing by parent (Christoph
   Hellwig & Jason Gunthorpe)

 - Fix mdpy error path leak (Colin Ian King)

 - Fix mtty list entry leak (Jason Gunthorpe)

 - Enforce mtty device limit (Alex Williamson)

 - Resolve concurrent vfio-pci mmap faults (Alex Williamson)

* tag 'vfio-v5.14-rc1' of git://github.com/awilliam/linux-vfio:
  vfio/pci: Handle concurrent vma faults
  vfio/mtty: Enforce available_instances
  vfio/mtty: Delete mdev_devices_list
  vfio: use the new pci_dev_trylock() helper to simplify try lock
  PCI: Export pci_dev_trylock() and pci_dev_unlock()
  vfio/mdpy: Fix memory leak of object mdev_state->vconfig
  vfio/iommu_type1: rename vfio_group struck to vfio_iommu_group
  vfio/mbochs: Convert to use vfio_register_group_dev()
  vfio/mdpy: Convert to use vfio_register_group_dev()
  vfio/mtty: Convert to use vfio_register_group_dev()
  vfio/mdev: Allow the mdev_parent_ops to specify the device driver to bind
  vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE
  driver core: Export device_driver_attach()
  driver core: Don't return EPROBE_DEFER to userspace during sysfs bind
  driver core: Flow the return code from ->probe() through to sysfs bind
  driver core: Better distinguish probe errors in really_probe
  driver core: Pull required checks into driver_probe_device()
  vfio/platform: remove unneeded parent_module attribute
  vfio: centralize module refcount in subsystem layer
Merge tag 'linux-kselftest-kunit-fixes-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest 2021-07-02T19:58:26+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-07-02T19:58:26+00:00 a48ad6e7a35dc3f3b521249204daf4c9427628e5 Pull KUnit update from Shuah Khan: "Fixes and features: - add support for skipped tests - introduce kunit_kmalloc_array/kunit_kcalloc() helpers - add gnu_printf specifiers - add kunit_shutdown - add unit test for filtering suites by names - convert lib/test_list_sort.c to use KUnit - code organization moving default config to tools/testing/kunit - refactor of internal parser input handling - cleanups and updates to documentation - code cleanup related to casts" * tag 'linux-kselftest-kunit-fixes-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (29 commits) kunit: add unit test for filtering suites by names kasan: test: make use of kunit_skip() kunit: test: Add example tests which are always skipped kunit: tool: Support skipped tests in kunit_tool kunit: Support skipped tests thunderbolt: test: Reinstate a few casts of bitfields kunit: tool: internal refactor of parser input handling lib/test: convert lib/test_list_sort.c to use KUnit kunit: introduce kunit_kmalloc_array/kunit_kcalloc() helpers kunit: Remove the unused all_tests.config kunit: Move default config from arch/um -> tools/testing/kunit kunit: arch/um/configs: Enable KUNIT_ALL_TESTS by default kunit: Add gnu_printf specifiers lib/cmdline_kunit: Remove a cast which are no-longer required kernel/sysctl-test: Remove some casts which are no-longer required thunderbolt: test: Remove some casts which are no longer required mmc: sdhci-of-aspeed: Remove some unnecessary casts from KUnit tests iio: Remove a cast in iio-test-format which is no longer required device property: Remove some casts in property-entry-test Documentation: kunit: Clean up some string casts in examples ... 
Pull KUnit update from Shuah Khan:
 "Fixes and features:

   - add support for skipped tests

   - introduce kunit_kmalloc_array/kunit_kcalloc() helpers

   - add gnu_printf specifiers

   - add kunit_shutdown

   - add unit test for filtering suites by names

   - convert lib/test_list_sort.c to use KUnit

   - code organization moving default config to tools/testing/kunit

   - refactor of internal parser input handling

   - cleanups and updates to documentation

   - code cleanup related to casts"

* tag 'linux-kselftest-kunit-fixes-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (29 commits)
  kunit: add unit test for filtering suites by names
  kasan: test: make use of kunit_skip()
  kunit: test: Add example tests which are always skipped
  kunit: tool: Support skipped tests in kunit_tool
  kunit: Support skipped tests
  thunderbolt: test: Reinstate a few casts of bitfields
  kunit: tool: internal refactor of parser input handling
  lib/test: convert lib/test_list_sort.c to use KUnit
  kunit: introduce kunit_kmalloc_array/kunit_kcalloc() helpers
  kunit: Remove the unused all_tests.config
  kunit: Move default config from arch/um -> tools/testing/kunit
  kunit: arch/um/configs: Enable KUNIT_ALL_TESTS by default
  kunit: Add gnu_printf specifiers
  lib/cmdline_kunit: Remove a cast which are no-longer required
  kernel/sysctl-test: Remove some casts which are no-longer required
  thunderbolt: test: Remove some casts which are no longer required
  mmc: sdhci-of-aspeed: Remove some unnecessary casts from KUnit tests
  iio: Remove a cast in iio-test-format which is no longer required
  device property: Remove some casts in property-entry-test
  Documentation: kunit: Clean up some string casts in examples
  ...
PM: sleep: Use ktime_us_delta() in initcall_debug_report() 2021-07-01T16:44:02+00:00 Mark-PK Tsai mark-pk.tsai@mediatek.com 2021-07-01T00:45:38+00:00 75674eb06a28816af2a7331dcee4088cc1ab5f6d Use ktime_us_delta() to make the debug log more precise instead of shifting the return value of ktime_to_ns() applied to a ktime_sub() result by 10 bit positions to the right. Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com> [ rjw: Changelog rewrite, subject edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 
Use ktime_us_delta() to make the debug log more precise instead of
shifting the return value of ktime_to_ns() applied to a ktime_sub()
result by 10 bit positions to the right.

Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
[ rjw: Changelog rewrite, subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
arch_topology: Avoid use-after-free for scale_freq_data 2021-07-01T02:02:14+00:00 Viresh Kumar viresh.kumar@linaro.org 2021-06-15T08:57:50+00:00 83150f5d05f065fb5c12c612f119015cabdcc124 Currently topology_scale_freq_tick() (which gets called from scheduler_tick()) may end up using a pointer to "struct scale_freq_data", which was previously cleared by topology_clear_scale_freq_source(), as there is no protection in place here. The users of topology_clear_scale_freq_source() though needs a guarantee that the previously cleared scale_freq_data isn't used anymore, so they can free the related resources. Since topology_scale_freq_tick() is called from scheduler tick, we don't want to add locking in there. Use the RCU update mechanism instead (which is already used by the scheduler's utilization update path) to guarantee race free updates here. synchronize_rcu() makes sure that all RCU critical sections that started before it is called, will finish before it returns. And so the callers of topology_clear_scale_freq_source() don't need to worry about their callback getting called anymore. Cc: Paul E. McKenney <paulmck@kernel.org> Fixes: 01e055c120a4 ("arch_topology: Allow multiple entities to provide sched_freq_tick() callback") Tested-by: Vincent Guittot <vincent.guittot@linaro.org> Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com> Tested-by: Qian Cai <quic_qiancai@quicinc.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> 
Currently topology_scale_freq_tick() (which gets called from
scheduler_tick()) may end up using a pointer to "struct
scale_freq_data", which was previously cleared by
topology_clear_scale_freq_source(), as there is no protection in place
here. The users of topology_clear_scale_freq_source() though needs a
guarantee that the previously cleared scale_freq_data isn't used
anymore, so they can free the related resources.

Since topology_scale_freq_tick() is called from scheduler tick, we don't
want to add locking in there. Use the RCU update mechanism instead
(which is already used by the scheduler's utilization update path) to
guarantee race free updates here.

synchronize_rcu() makes sure that all RCU critical sections that started
before it is called, will finish before it returns. And so the callers
of topology_clear_scale_freq_source() don't need to worry about their
callback getting called anymore.

Cc: Paul E. McKenney <paulmck@kernel.org>
Fixes: 01e055c120a4 ("arch_topology: Allow multiple entities to provide sched_freq_tick() callback")
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Qian Cai <quic_qiancai@quicinc.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Merge tag 'net-next-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2021-06-30T22:51:09+00:00 Linus Torvalds torvalds@linux-foundation.org 2021-06-30T22:51:09+00:00 dbe69e43372212527abf48609aba7fc39a6daa27 Pull networking updates from Jakub Kicinski: "Core: - BPF: - add syscall program type and libbpf support for generating instructions and bindings for in-kernel BPF loaders (BPF loaders for BPF), this is a stepping stone for signed BPF programs - infrastructure to migrate TCP child sockets from one listener to another in the same reuseport group/map to improve flexibility of service hand-off/restart - add broadcast support to XDP redirect - allow bypass of the lockless qdisc to improving performance (for pktgen: +23% with one thread, +44% with 2 threads) - add a simpler version of "DO_ONCE()" which does not require jump labels, intended for slow-path usage - virtio/vsock: introduce SOCK_SEQPACKET support - add getsocketopt to retrieve netns cookie - ip: treat lowest address of a IPv4 subnet as ordinary unicast address allowing reclaiming of precious IPv4 addresses - ipv6: use prandom_u32() for ID generation - ip: add support for more flexible field selection for hashing across multi-path routes (w/ offload to mlxsw) - icmp: add support for extended RFC 8335 PROBE (ping) - seg6: add support for SRv6 End.DT46 behavior - mptcp: - DSS checksum support (RFC 8684) to detect middlebox meddling - support Connection-time 'C' flag - time stamping support - sctp: packetization Layer Path MTU Discovery (RFC 8899) - xfrm: speed up state addition with seq set - WiFi: - hidden AP discovery on 6 GHz and other HE 6 GHz improvements - aggregation handling improvements for some drivers - minstrel improvements for no-ack frames - deferred rate control for TXQs to improve reaction times - switch from round robin to virtual time-based airtime scheduler - add trace points: - tcp checksum errors - openvswitch - action execution, upcalls - socket errors via sk_error_report Device APIs: - devlink: add rate API for hierarchical control of max egress rate of virtual devices (VFs, SFs etc.) - don't require RCU read lock to be held around BPF hooks in NAPI context - page_pool: generic buffer recycling New hardware/drivers: - mobile: - iosm: PCIe Driver for Intel M.2 Modem - support for Qualcomm MSM8998 (ipa) - WiFi: Qualcomm QCN9074 and WCN6855 PCI devices - sparx5: Microchip SparX-5 family of Enterprise Ethernet switches - Mellanox BlueField Gigabit Ethernet (control NIC of the DPU) - NXP SJA1110 Automotive Ethernet 10-port switch - Qualcomm QCA8327 switch support (qca8k) - Mikrotik 10/25G NIC (atl1c) Driver changes: - ACPI support for some MDIO, MAC and PHY devices from Marvell and NXP (our first foray into MAC/PHY description via ACPI) - HW timestamping (PTP) support: bnxt_en, ice, sja1105, hns3, tja11xx - Mellanox/Nvidia NIC (mlx5) - NIC VF offload of L2 bridging - support IRQ distribution to Sub-functions - Marvell (prestera): - add flower and match all - devlink trap - link aggregation - Netronome (nfp): connection tracking offload - Intel 1GE (igc): add AF_XDP support - Marvell DPU (octeontx2): ingress ratelimit offload - Google vNIC (gve): new ring/descriptor format support - Qualcomm mobile (rmnet & ipa): inline checksum offload support - MediaTek WiFi (mt76) - mt7915 MSI support - mt7915 Tx status reporting - mt7915 thermal sensors support - mt7921 decapsulation offload - mt7921 enable runtime pm and deep sleep - Realtek WiFi (rtw88) - beacon filter support - Tx antenna path diversity support - firmware crash information via devcoredump - Qualcomm WiFi (wcn36xx) - Wake-on-WLAN support with magic packets and GTK rekeying - Micrel PHY (ksz886x/ksz8081): add cable test support" * tag 'net-next-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (2168 commits) tcp: change ICSK_CA_PRIV_SIZE definition tcp_yeah: check struct yeah size at compile time gve: DQO: Fix off by one in gve_rx_dqo() stmmac: intel: set PCI_D3hot in suspend stmmac: intel: Enable PHY WOL option in EHL net: stmmac: option to enable PHY WOL with PMT enabled net: say "local" instead of "static" addresses in ndo_dflt_fdb_{add,del} net: use netdev_info in ndo_dflt_fdb_{add,del} ptp: Set lookup cookie when creating a PTP PPS source. net: sock: add trace for socket errors net: sock: introduce sk_error_report net: dsa: replay the local bridge FDB entries pointing to the bridge dev too net: dsa: ensure during dsa_fdb_offload_notify that dev_hold and dev_put are on the same dev net: dsa: include fdb entries pointing to bridge in the host fdb list net: dsa: include bridge addresses which are local in the host fdb list net: dsa: sync static FDB entries on foreign interfaces to hardware net: dsa: install the host MDB and FDB entries in the master's RX filter net: dsa: reference count the FDB addresses at the cross-chip notifier level net: dsa: introduce a separate cross-chip notifier type for host FDBs net: dsa: reference count the MDB entries at the cross-chip notifier level ... 
Pull networking updates from Jakub Kicinski:
 "Core:

   - BPF:
      - add syscall program type and libbpf support for generating
        instructions and bindings for in-kernel BPF loaders (BPF loaders
        for BPF), this is a stepping stone for signed BPF programs
      - infrastructure to migrate TCP child sockets from one listener to
        another in the same reuseport group/map to improve flexibility
        of service hand-off/restart
      - add broadcast support to XDP redirect

   - allow bypass of the lockless qdisc to improving performance (for
     pktgen: +23% with one thread, +44% with 2 threads)

   - add a simpler version of "DO_ONCE()" which does not require jump
     labels, intended for slow-path usage

   - virtio/vsock: introduce SOCK_SEQPACKET support

   - add getsocketopt to retrieve netns cookie

   - ip: treat lowest address of a IPv4 subnet as ordinary unicast
     address allowing reclaiming of precious IPv4 addresses

   - ipv6: use prandom_u32() for ID generation

   - ip: add support for more flexible field selection for hashing
     across multi-path routes (w/ offload to mlxsw)

   - icmp: add support for extended RFC 8335 PROBE (ping)

   - seg6: add support for SRv6 End.DT46 behavior

   - mptcp:
      - DSS checksum support (RFC 8684) to detect middlebox meddling
      - support Connection-time 'C' flag
      - time stamping support

   - sctp: packetization Layer Path MTU Discovery (RFC 8899)

   - xfrm: speed up state addition with seq set

   - WiFi:
      - hidden AP discovery on 6 GHz and other HE 6 GHz improvements
      - aggregation handling improvements for some drivers
      - minstrel improvements for no-ack frames
      - deferred rate control for TXQs to improve reaction times
      - switch from round robin to virtual time-based airtime scheduler

   - add trace points:
      - tcp checksum errors
      - openvswitch - action execution, upcalls
      - socket errors via sk_error_report

  Device APIs:

   - devlink: add rate API for hierarchical control of max egress rate
     of virtual devices (VFs, SFs etc.)

   - don't require RCU read lock to be held around BPF hooks in NAPI
     context

   - page_pool: generic buffer recycling

  New hardware/drivers:

   - mobile:
      - iosm: PCIe Driver for Intel M.2 Modem
      - support for Qualcomm MSM8998 (ipa)

   - WiFi: Qualcomm QCN9074 and WCN6855 PCI devices

   - sparx5: Microchip SparX-5 family of Enterprise Ethernet switches

   - Mellanox BlueField Gigabit Ethernet (control NIC of the DPU)

   - NXP SJA1110 Automotive Ethernet 10-port switch

   - Qualcomm QCA8327 switch support (qca8k)

   - Mikrotik 10/25G NIC (atl1c)

  Driver changes:

   - ACPI support for some MDIO, MAC and PHY devices from Marvell and
     NXP (our first foray into MAC/PHY description via ACPI)

   - HW timestamping (PTP) support: bnxt_en, ice, sja1105, hns3, tja11xx

   - Mellanox/Nvidia NIC (mlx5)
      - NIC VF offload of L2 bridging
      - support IRQ distribution to Sub-functions

   - Marvell (prestera):
      - add flower and match all
      - devlink trap
      - link aggregation

   - Netronome (nfp): connection tracking offload

   - Intel 1GE (igc): add AF_XDP support

   - Marvell DPU (octeontx2): ingress ratelimit offload

   - Google vNIC (gve): new ring/descriptor format support

   - Qualcomm mobile (rmnet & ipa): inline checksum offload support

   - MediaTek WiFi (mt76)
      - mt7915 MSI support
      - mt7915 Tx status reporting
      - mt7915 thermal sensors support
      - mt7921 decapsulation offload
      - mt7921 enable runtime pm and deep sleep

   - Realtek WiFi (rtw88)
      - beacon filter support
      - Tx antenna path diversity support
      - firmware crash information via devcoredump

   - Qualcomm WiFi (wcn36xx)
      - Wake-on-WLAN support with magic packets and GTK rekeying

   - Micrel PHY (ksz886x/ksz8081): add cable test support"

* tag 'net-next-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (2168 commits)
  tcp: change ICSK_CA_PRIV_SIZE definition
  tcp_yeah: check struct yeah size at compile time
  gve: DQO: Fix off by one in gve_rx_dqo()
  stmmac: intel: set PCI_D3hot in suspend
  stmmac: intel: Enable PHY WOL option in EHL
  net: stmmac: option to enable PHY WOL with PMT enabled
  net: say "local" instead of "static" addresses in ndo_dflt_fdb_{add,del}
  net: use netdev_info in ndo_dflt_fdb_{add,del}
  ptp: Set lookup cookie when creating a PTP PPS source.
  net: sock: add trace for socket errors
  net: sock: introduce sk_error_report
  net: dsa: replay the local bridge FDB entries pointing to the bridge dev too
  net: dsa: ensure during dsa_fdb_offload_notify that dev_hold and dev_put are on the same dev
  net: dsa: include fdb entries pointing to bridge in the host fdb list
  net: dsa: include bridge addresses which are local in the host fdb list
  net: dsa: sync static FDB entries on foreign interfaces to hardware
  net: dsa: install the host MDB and FDB entries in the master's RX filter
  net: dsa: reference count the FDB addresses at the cross-chip notifier level
  net: dsa: introduce a separate cross-chip notifier type for host FDBs
  net: dsa: reference count the MDB entries at the cross-chip notifier level
  ...