linux-toradex.git/drivers/net/ethernet/qualcomm, branch v5.9-rc5

net: qcom/emac: add missed clk_disable_unprepare in error path of emac_clks_phase1_init

2020-08-11T17:36:47+00:00

Fix the missing clk_disable_unprepare() before return
from emac_clks_phase1_init() in the error handling case.

Fixes: b9b17debc69d ("net: emac: emac gigabit ethernet controller driver")
Reported-by: Hulk Robot 
Signed-off-by: Wang Hai 
Acked-by: Timur Tabi 
Signed-off-by: David S. Miller

net: rmnet: do not allow to add multiple bridge interfaces

2020-07-05T01:04:55+00:00

rmnet can have only two bridge interface.
One of them is a link interface and another one is added by
the master operation.
rmnet interface shouldn't allow adding additional
bridge interfaces by mater operation.
But, there is no code to deny additional interfaces.
So, interface leak occurs.

Test commands:
    ip link add dummy0 type dummy
    ip link add dummy1 type dummy
    ip link add dummy2 type dummy
    ip link add rmnet0 link dummy0 type rmnet mux_id 1
    ip link set dummy1 master rmnet0
    ip link set dummy2 master rmnet0
    ip link del rmnet0

In the above test command, the dummy0 was attached to rmnet as VND mode.
Then, dummy1 was attached to rmnet0 as BRIDGE mode.
At this point, dummy0 mode is switched from VND to BRIDGE automatically.
Then, dummy2 is attached to rmnet as BRIDGE mode.
At this point, rmnet0 should deny this operation.
But, rmnet0 doesn't deny this.
So that below splat occurs when the rmnet0 interface is deleted.

Splat looks like:
[  186.684787][    C2] WARNING: CPU: 2 PID: 1009 at net/core/dev.c:8992 rollback_registered_many+0x986/0xcf0
[  186.684788][    C2] Modules linked in: rmnet dummy openvswitch nsh nf_conncount nf_nat nf_conntrack nf_defrag_x
[  186.684805][    C2] CPU: 2 PID: 1009 Comm: ip Not tainted 5.8.0-rc1+ #621
[  186.684807][    C2] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[  186.684808][    C2] RIP: 0010:rollback_registered_many+0x986/0xcf0
[  186.684811][    C2] Code: 41 8b 4e cc 45 31 c0 31 d2 4c 89 ee 48 89 df e8 e0 47 ff ff 85 c0 0f 84 cd fc ff ff 5
[  186.684812][    C2] RSP: 0018:ffff8880cd9472e0 EFLAGS: 00010287
[  186.684815][    C2] RAX: ffff8880cc56da58 RBX: ffff8880ab21c000 RCX: ffffffff9329d323
[  186.684816][    C2] RDX: 1ffffffff2be6410 RSI: 0000000000000008 RDI: ffffffff95f32080
[  186.684818][    C2] RBP: dffffc0000000000 R08: fffffbfff2be6411 R09: fffffbfff2be6411
[  186.684819][    C2] R10: ffffffff95f32087 R11: 0000000000000001 R12: ffff8880cd947480
[  186.684820][    C2] R13: ffff8880ab21c0b8 R14: ffff8880cd947400 R15: ffff8880cdf10640
[  186.684822][    C2] FS:  00007f00843890c0(0000) GS:ffff8880d4e00000(0000) knlGS:0000000000000000
[  186.684823][    C2] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  186.684825][    C2] CR2: 000055b8ab1077b8 CR3: 00000000ab612006 CR4: 00000000000606e0
[  186.684826][    C2] Call Trace:
[  186.684827][    C2]  ? lockdep_hardirqs_on_prepare+0x379/0x540
[  186.684829][    C2]  ? netif_set_real_num_tx_queues+0x780/0x780
[  186.684830][    C2]  ? rmnet_unregister_real_device+0x56/0x90 [rmnet]
[  186.684831][    C2]  ? __kasan_slab_free+0x126/0x150
[  186.684832][    C2]  ? kfree+0xdc/0x320
[  186.684834][    C2]  ? rmnet_unregister_real_device+0x56/0x90 [rmnet]
[  186.684835][    C2]  unregister_netdevice_many.part.135+0x13/0x1b0
[  186.684836][    C2]  rtnl_delete_link+0xbc/0x100
[ ... ]
[  238.440071][ T1009] unregister_netdevice: waiting for rmnet0 to become free. Usage count = 1

Fixes: 037f9cdf72fb ("net: rmnet: use upper/lower device infrastructure")
Signed-off-by: Taehee Yoo 
Signed-off-by: David S. Miller

net: rmnet: fix lower interface leak

2020-07-05T01:04:55+00:00

There are two types of the lower interface of rmnet that are VND
and BRIDGE.
Each lower interface can have only one type either VND or BRIDGE.
But, there is a case, which uses both lower interface types.
Due to this unexpected behavior, lower interface leak occurs.

Test commands:
    ip link add dummy0 type dummy
    ip link add dummy1 type dummy
    ip link add rmnet0 link dummy0 type rmnet mux_id 1
    ip link set dummy1 master rmnet0
    ip link add rmnet1 link dummy1 type rmnet mux_id 2
    ip link del rmnet0

The dummy1 was attached as BRIDGE interface of rmnet0.
Then, it also was attached as VND interface of rmnet1.
This is unexpected behavior and there is no code for handling this case.
So that below splat occurs when the rmnet0 interface is deleted.

Splat looks like:
[   53.254112][    C1] WARNING: CPU: 1 PID: 1192 at net/core/dev.c:8992 rollback_registered_many+0x986/0xcf0
[   53.254117][    C1] Modules linked in: rmnet dummy openvswitch nsh nf_conncount nf_nat nf_conntrack nf_defrag_ipv6 nfx
[   53.254182][    C1] CPU: 1 PID: 1192 Comm: ip Not tainted 5.8.0-rc1+ #620
[   53.254188][    C1] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[   53.254192][    C1] RIP: 0010:rollback_registered_many+0x986/0xcf0
[   53.254200][    C1] Code: 41 8b 4e cc 45 31 c0 31 d2 4c 89 ee 48 89 df e8 e0 47 ff ff 85 c0 0f 84 cd fc ff ff 0f 0b e5
[   53.254205][    C1] RSP: 0018:ffff888050a5f2e0 EFLAGS: 00010287
[   53.254214][    C1] RAX: ffff88805756d658 RBX: ffff88804d99c000 RCX: ffffffff8329d323
[   53.254219][    C1] RDX: 1ffffffff0be6410 RSI: 0000000000000008 RDI: ffffffff85f32080
[   53.254223][    C1] RBP: dffffc0000000000 R08: fffffbfff0be6411 R09: fffffbfff0be6411
[   53.254228][    C1] R10: ffffffff85f32087 R11: 0000000000000001 R12: ffff888050a5f480
[   53.254233][    C1] R13: ffff88804d99c0b8 R14: ffff888050a5f400 R15: ffff8880548ebe40
[   53.254238][    C1] FS:  00007f6b86b370c0(0000) GS:ffff88806c200000(0000) knlGS:0000000000000000
[   53.254243][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   53.254248][    C1] CR2: 0000562c62438758 CR3: 000000003f600005 CR4: 00000000000606e0
[   53.254253][    C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   53.254257][    C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   53.254261][    C1] Call Trace:
[   53.254266][    C1]  ? lockdep_hardirqs_on_prepare+0x379/0x540
[   53.254270][    C1]  ? netif_set_real_num_tx_queues+0x780/0x780
[   53.254275][    C1]  ? rmnet_unregister_real_device+0x56/0x90 [rmnet]
[   53.254279][    C1]  ? __kasan_slab_free+0x126/0x150
[   53.254283][    C1]  ? kfree+0xdc/0x320
[   53.254288][    C1]  ? rmnet_unregister_real_device+0x56/0x90 [rmnet]
[   53.254293][    C1]  unregister_netdevice_many.part.135+0x13/0x1b0
[   53.254297][    C1]  rtnl_delete_link+0xbc/0x100
[   53.254301][    C1]  ? rtnl_af_register+0xc0/0xc0
[   53.254305][    C1]  rtnl_dellink+0x2dc/0x840
[   53.254309][    C1]  ? find_held_lock+0x39/0x1d0
[   53.254314][    C1]  ? valid_fdb_dump_strict+0x620/0x620
[   53.254318][    C1]  ? rtnetlink_rcv_msg+0x457/0x890
[   53.254322][    C1]  ? lock_contended+0xd20/0xd20
[   53.254326][    C1]  rtnetlink_rcv_msg+0x4a8/0x890
[ ... ]
[   73.813696][ T1192] unregister_netdevice: waiting for rmnet0 to become free. Usage count = 1

Fixes: 037f9cdf72fb ("net: rmnet: use upper/lower device infrastructure")
Signed-off-by: Taehee Yoo 
Signed-off-by: David S. Miller

treewide: replace '---help---' in Kconfig files with 'help'

2020-06-13T16:57:21+00:00

Since commit 84af7a6194e4 ("checkpatch: kconfig: prefer 'help' over
'---help---'"), the number of '---help---' has been gradually
decreasing, but there are still more than 2400 instances.

This commit finishes the conversion. While I touched the lines,
I also fixed the indentation.

There are a variety of indentation styles found.

  a) 4 spaces + '---help---'
  b) 7 spaces + '---help---'
  c) 8 spaces + '---help---'
  d) 1 space + 1 tab + '---help---'
  e) 1 tab + '---help---'    (correct indentation)
  f) 1 tab + 1 space + '---help---'
  g) 1 tab + 2 spaces + '---help---'

In order to convert all of them to 1 tab + 'help', I ran the
following commend:

  $ find . -name 'Kconfig*' | xargs sed -i 's/^[[:space:]]*---help---/\thelp/'

Signed-off-by: Masahiro Yamada

net: emac: Fix use correct return type for ndo_start_xmit()

2020-05-05T18:20:23+00:00

The method ndo_start_xmit() returns a value of type netdev_tx_t. Fix
the ndo function to use the correct type.

Signed-off-by: Yunjian Wang 
Signed-off-by: David S. Miller

net: qualcomm: rmnet: Allow configuration updates to existing devices

2020-04-02T13:50:04+00:00

This allows the changelink operation to succeed if the mux_id was
specified as an argument. Note that the mux_id must match the
existing mux_id of the rmnet device or should be an unused mux_id.

Fixes: 1dc49e9d164c ("net: rmnet: do not allow to change mux id if mux id is duplicated")
Reported-and-tested-by: Alex Elder 
Signed-off-by: Sean Tranchetti 
Signed-off-by: Subash Abhinov Kasiviswanathan 
Signed-off-by: David S. Miller

net: rmnet: set NETIF_F_LLTX flag

2020-03-09T04:36:37+00:00

The rmnet_vnd_setup(), which is the callback of ->ndo_start_xmit() is
allowed to call concurrently because it uses RCU protected data.
So, it doesn't need tx lock.

Signed-off-by: Taehee Yoo 
Signed-off-by: David S. Miller

net: rmnet: use GFP_KERNEL instead of GFP_ATOMIC

2020-03-05T19:47:10+00:00

In the current code, rmnet_register_real_device() and rmnet_newlink()
are using GFP_ATOMIC.
But, these functions are allowed to sleep.
So, GFP_KERNEL can be used.

Signed-off-by: Taehee Yoo 
Signed-off-by: David S. Miller

net: rmnet: print error message when command fails

2020-03-05T19:47:10+00:00

When rmnet netlink command fails, it doesn't print any error message.
So, users couldn't know the exact reason.
In order to tell the exact reason to the user, the extack error message
is used in this patch.

Signed-off-by: Taehee Yoo 
Signed-off-by: David S. Miller

net: rmnet: add missing module alias

2020-03-05T19:47:10+00:00

In the current rmnet code, there is no module alias.
So, RTNL couldn't load rmnet module automatically.

Test commands:
    ip link add dummy0 type dummy
    modprobe -rv rmnet
    ip link add rmnet0 link dummy0 type rmnet  mux_id 1

Signed-off-by: Taehee Yoo 
Signed-off-by: David S. Miller