Re: [PATCH] wifi: ath12k: Fix WARN_ON during firmware crash in split-phy

[Kalle Valo <kvalo@kernel.org>]

Aaradhana Sahu <quic_aarasahu@quicinc.com> writes:

> On 6/10/2024 10:40 PM, Kalle Valo wrote:
>> Aaradhana Sahu <quic_aarasahu@quicinc.com> writes:
>> 
>>> Whenever firmware is crashed in split-phy below WARN_ON triggered:
>>>
>>> ? __warn+0x7b/0x1a0
>>> ? drv_stop+0x1eb/0x210 [mac80211]
>>> ? report_bug+0x10b/0x200
>>> ? handle_bug+0x3f/0x70
>>> ? exc_invalid_op+0x13/0x60
>>> ? asm_exc_invalid_op+0x16/0x20
>>> ? drv_stop+0x1eb/0x210 [mac80211]
>>> ieee80211_do_stop+0x5ba/0x850 [mac80211]
>>> ieee80211_stop+0x51/0x180 [mac80211]
>>> __dev_close_many+0xb3/0x130
>>> dev_close_many+0xa3/0x180
>>> ? lock_release+0xde/0x420
>>> dev_close.part.147+0x5f/0xa0
>>> cfg80211_shutdown_all_interfaces+0x44/0xe0 [cfg80211]
>>> ieee80211_restart_work+0xf9/0x130 [mac80211]
>>> process_scheduled_works+0x377/0x6f0
>> 
>> This is just the stack trace, not the full warning. If you send me the
>> full warning I can add it to the commit message. Also it would be always
>> good to identify what warning it is exactly as line numbers can change
>> etc.
>> 
>
> Sure, the full warning is given below:
>
> [ 364.713223] WARNING: CPU: 3 PID: 82 at net/mac80211/driver-ops.c:41
> drv_stop+0xac/0xbc
> [  364.716875] Modules linked in: ath12k qmi_helpers
> [ 364.724598] CPU: 3 PID: 82 Comm: kworker/3:2 Tainted: G D W
> 6.9.0-next-20240520-00113-gd981a3784e15 #39
> [  364.729378] Hardware name: Qualcomm Technologies, Inc. IPQ9574/AP-AL02-C9 (DT)
> [  364.739965] Workqueue: events_freezable ieee80211_restart_work
> [  364.747082] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [  364.752897] pc : drv_stop+0xac/0xbc
> [  364.759752] lr : ieee80211_stop_device+0x54/0x64
> [  364.763226] sp : ffff8000848dbb20
> [  364.768085] x29: ffff8000848dbb20 x28: 0000000000000790 x27: ffff000014d78900
> [  364.771301] x26: ffff000014d791f8 x25: ffff000007f0d9b0 x24: 0000000000000018
> [  364.778419] x23: 0000000000000001 x22: 0000000000000000 x21: ffff000014d78e10
> [  364.785537] x20: ffff800081dc0000 x19: ffff000014d78900 x18: ffffffffffffffff
> [  364.792655] x17: ffff7fffbca84000 x16: ffff800083fe0000 x15: ffff800081dc0b48
> [  364.799774] x14: 0000000000000076 x13: 0000000000000076 x12: 0000000000000001
> [  364.806892] x11: 0000000000000000 x10: 0000000000000a60 x9 : ffff8000848db980
> [  364.814009] x8 : ffff000000dddfc0 x7 : 0000000000000400 x6 : ffff800083b012d8
> [  364.821128] x5 : ffff800083b012d8 x4 : 0000000000000000 x3 : ffff000014d78398
> [  364.828246] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000014d78900
> [  364.835364] Call trace:
> [  364.842478]  drv_stop+0xac/0xbc
> [  364.844734]  ieee80211_stop_device+0x54/0x64
> [  364.847860]  ieee80211_do_stop+0x5a0/0x790
> [  364.852375]  ieee80211_stop+0x4c/0x178
> [  364.856280]  __dev_close_many+0xb0/0x150
> [  364.860014]  dev_close_many+0x88/0x130
> [  364.864092]  dev_close.part.171+0x44/0x74
> [  364.867653]  dev_close+0x1c/0x28
> [  364.871732]  cfg80211_shutdown_all_interfaces+0x44/0xfc
> [  364.875031]  ieee80211_restart_work+0xfc/0x14c
> [  364.879979]  process_scheduled_works+0x18c/0x2dc
> [  364.884494]  worker_thread+0x13c/0x314
> [  364.889266]  kthread+0x118/0x124
> [  364.892825]  ret_from_fork+0x10/0x20
> [  364.896211] ---[ end trace 0000000000000000 ]---

Thanks, so I assume it's this check from drv_stop():

	if (WARN_ON(!local->started))
		return;

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