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SubjectRe: [Bug] mt7921e driver in 5.16 causes kernel panic
From
On 1/11/22 16:31, Ben Greear wrote:
> On 1/11/22 3:17 PM, Khalid Aziz wrote:
>> I am seeing an intermittent bug in mt7921e driver. When the driver
>> module is loaded
>> and is being initialized, almost every other time it seems to write to
>> some wild
>> memory location. This results in driver failing to initialize with
>> message
>> "Timeout for driver own" and at the same time I start to see "Bad page
>> state" messages
>> for random processes. Here is the relevant part of dmesg:
>
> Please see if this helps?
>
> From: Ben Greear <greearb@candelatech.com>
>
> If the nic fails to start, it is possible that the
> reset_work has already been scheduled.  Ensure the
> work item is canceled so we do not have use-after-free
> crash in case cleanup is called before the work item
> is executed.
>
> This fixes crash on my x86_64 apu2 when mt7921k radio
> fails to work.  Radio still fails, but OS does not
> crash.
>
> Signed-off-by: Ben Greear <greearb@candelatech.com>
> ---
>  drivers/net/wireless/mediatek/mt76/mt7921/main.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
> b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
> index 6073bedaa1c08..9b33002dcba4a 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
> @@ -272,6 +272,7 @@ static void mt7921_stop(struct ieee80211_hw *hw)
>
>      cancel_delayed_work_sync(&dev->pm.ps_work);
>      cancel_work_sync(&dev->pm.wake_work);
> +    cancel_work_sync(&dev->reset_work);
>      mt76_connac_free_pending_tx_skbs(&dev->pm, NULL);
>
>      mt7921_mutex_acquire(dev);

Hi Ben,

Unfortunately that did not help. I still saw the same messages and a
kernel panic. I do not see this bug if I power down the laptop before
booting it up, so mt7921_stop() would make sense as the reasonable place
to fix it.

Thanks,
Khalid

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