linux-toradex.git/drivers/tty/hvc, branch v3.6-rc1

Merge tag 'stable/for-linus-3.6-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen

2012-07-24T20:14:03+00:00

Pull Xen update from Konrad Rzeszutek Wilk:
"Features:
* Performance improvement to lower the amount of traps the hypervisor
has to do 32-bit guests. Mainly for setting PTE entries and
updating TLS descriptors.
* MCE polling driver to collect hypervisor MCE buffer and present
them to /dev/mcelog.
* Physical CPU online/offline support. When an privileged guest is
booted it is present with virtual CPUs, which might have an 1:1 to
physical CPUs but usually don't. This provides mechanism to
offline/online physical CPUs.
Bug-fixes for:
* Coverity found fixes in the console and ACPI processor driver.
* PVonHVM kexec fixes along with some cleanups.
* Pages that fall within E820 gaps and non-RAM regions (and had been
released to hypervisor) would be populated back, but potentially in
non-RAM regions."

* tag 'stable/for-linus-3.6-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen: populate correct number of pages when across mem boundary (v2)
xen PVonHVM: move shared_info to MMIO before kexec
xen: simplify init_hvm_pv_info
xen: remove cast from HYPERVISOR_shared_info assignment
xen: enable platform-pci only in a Xen guest
xen/pv-on-hvm kexec: shutdown watches from old kernel
xen/x86: avoid updating TLS descriptors if they haven't changed
xen/x86: add desc_equal() to compare GDT descriptors
xen/mm: zero PTEs for non-present MFNs in the initial page table
xen/mm: do direct hypercall in xen_set_pte() if batching is unavailable
xen/hvc: Fix up checks when the info is allocated.
xen/acpi: Fix potential memory leak.
xen/mce: add .poll method for mcelog device driver
xen/mce: schedule a workqueue to avoid sleep in atomic context
xen/pcpu: Xen physical cpus online/offline sys interface
xen/mce: Register native mce handler as vMCE bounce back point
x86, MCE, AMD: Adjust initcall sequence for xen
xen/mce: Add mcelog support for Xen platform

xen/hvc: Fix up checks when the info is allocated.

2012-07-19T19:51:42+00:00

Coverity would complain about this - even thought it looks OK.

CID 401957
Signed-off-by: Konrad Rzeszutek Wilk

tty/hvc_opal: Fix debug function name

2012-07-10T09:16:25+00:00

udbg_init_debug_opal() should be udbg_init_debug_opal_raw() as
the caller in arch/powerpc/kernel/udbg.c expects

Signed-off-by: Benjamin Herrenschmidt

Merge tag 'stable/for-linus-3.5-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen

2012-06-16T00:17:15+00:00

Pull five Xen bug-fixes from Konrad Rzeszutek Wilk:

 - When booting as PVHVM we would try to use PV console - but would not validate
   the parameters causing us to crash during restore b/c we re-use the wrong event
   channel.
 - When booting on machines with SR-IOV PCI bridge we didn't check for the bridge
   and tried to use it.
 - Under AMD machines would advertise the APERFMPERF resulting in needless amount
   of MSRs from the guest.
 - A global value (xen_released_pages) was not subtracted at bootup when pages
   were added back in. This resulted in the balloon worker having the wrong
   account of how many pages were truly released.
 - Fix dead-lock when xen-blkfront is run in the same domain as xen-blkback.

* tag 'stable/for-linus-3.5-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen: mark local pages as FOREIGN in the m2p_override
  xen/setup: filter APERFMPERF cpuid feature out
  xen/balloon: Subtract from xen_released_pages the count that is populated.
  xen/pci: Check for PCI bridge before using it.
  xen/events: Add WARN_ON when quick lookup found invalid type.
  xen/hvc: Check HVM_PARAM_CONSOLE_[EVTCHN|PFN] for correctness.
  xen/hvc: Fix error cases around HVM_PARAM_CONSOLE_PFN
  xen/hvc: Collapse error logic.

xen/hvc: Check HVM_PARAM_CONSOLE_[EVTCHN|PFN] for correctness.

2012-05-24T18:23:01+00:00

We need to make sure that those parameters are setup to be correct.
As such the value of 0 is deemed invalid and we find that we
bail out. The hypervisor sets by default all of them to be zero
and when the hypercall is done does a simple:

 a.value = d->arch.hvm_domain.params[a.index];

Which means that if the Xen toolstack forgot to setup the proper
HVM_PARAM_CONSOLE_EVTCHN (or the PFN one), we would get the
default value of 0 and use that.

CC: stable@kernel.org
Fixes-Oracle-Bug: 14091238
Signed-off-by: Konrad Rzeszutek Wilk

xen/hvc: Fix error cases around HVM_PARAM_CONSOLE_PFN

2012-05-24T18:15:35+00:00

We weren't resetting the parameter to be passed in to a
known default. Nor were we checking the return value of
hvm_get_parameter.

CC: stable@kernel.org
Signed-off-by: Konrad Rzeszutek Wilk

xen/hvc: Collapse error logic.

2012-05-24T18:15:29+00:00

All of the error paths are doing the same logic. In which
case we might as well collapse them in one path.

CC: stable@kernel.org
Acked-by: Stefano Stabellini 
Signed-off-by: Konrad Rzeszutek Wilk

hvc_xen: NULL dereference on allocation failure

2012-05-21T15:03:29+00:00

If kzalloc() returns a NULL here, we pass a NULL to
xencons_disconnect_backend() which will cause an Oops.

Also I removed the __GFP_ZERO while I was at it since kzalloc() implies
__GFP_ZERO.

CC: stable@kernel.org
Acked-by: Stefano Stabellini 
Signed-off-by: Dan Carpenter 
Signed-off-by: Konrad Rzeszutek Wilk

tty: hvc_xen: NULL dereference on allocation failure

2012-05-15T15:48:45+00:00

If kzalloc() returns a NULL here, we pass a NULL to
xencons_disconnect_backend() which will cause an Oops.

Also I removed the __GFP_ZERO while I was at it since kzalloc() implies
__GFP_ZERO.

Signed-off-by: Dan Carpenter 
Acked-by: Stefano Stabellini 
Signed-off-by: Greg Kroah-Hartman

TTY: hvc, fix TTY refcounting

2012-04-13T17:54:43+00:00

A -next commit "TTY: HVC, use tty from tty_port" switched the driver
to use tty_port helper for tty refcounting. But it omitted to remove
manual tty refcounting from open, close and hangup. So now we are
getting random crashes caused by use-after-free:
Unable to handle kernel paging request for data at address 0xc0000003f9d550
Faulting instruction address: 0xc0000000001b7f40
Oops: Kernel access of bad area, sig: 11 [#1]
...
NIP: c0000000001b7f40 LR: c0000000001b7f14 CTR: c0000000000e04f0
...
NIP [c0000000001b7f40] .__kmalloc+0x70/0x230
LR [c0000000001b7f14] .__kmalloc+0x44/0x230
Call Trace:
[c0000003f68bf930] [c0000003f68bf9b0] 0xc0000003f68bf9b0 (unreliable)
[c0000003f68bf9e0] [c0000000001e5424] .alloc_fdmem+0x24/0x70
[c0000003f68bfa60] [c0000000001e54f8] .alloc_fdtable+0x88/0x130
[c0000003f68bfaf0] [c0000000001e5924] .dup_fd+0x384/0x450
[c0000003f68bfbd0] [c00000000009a310] .copy_process+0x880/0x11d0
[c0000003f68bfcd0] [c00000000009aee0] .do_fork+0x70/0x400
[c0000003f68bfdc0] [c0000000000141c4] .sys_clone+0x54/0x70
[c0000003f68bfe30] [c000000000009aa0] .ppc_clone+0x8/0xc

Fix that by complete removal of tty_kref_get/put in open/close/hangup
paths.

Signed-off-by: Jiri Slaby 
Reported-and-tested-by: Michael Neuling 
Cc: Stephen Rothwell 
Cc: ppc-dev 
Signed-off-by: Greg Kroah-Hartman