[PATCH RFC v2 1/4] wifi: ath12k: switch to using wiphy_lock() and remove ar->conf_mutex

[Kalle Valo]

Kalle Valo <kvalo at kernel.org> writes:

> Baochen Qiang <quic_bqiang at quicinc.com> writes:
>
>> On 9/19/2024 2:10 AM, Kalle Valo wrote:
>>> @@ -4310,7 +4301,7 @@ static void ath12k_sta_rc_update_wk(struct work_struct *wk)
>>>  
>>>  	spin_unlock_bh(&ar->data_lock);
>>>  
>>> -	mutex_lock(&ar->conf_mutex);
>>> +	wiphy_lock(ath12k_ar_to_hw(ar)->wiphy);
>>
>> note in patch 4/4 ath12k_sta::update_wk is converted to use
>> wiphy_work. While a wiphy work item is running wiphy lock is held
>> already. So here try to acquire wiphy lock once again will lead to a
>> deadlock.
>
> Ouch again, thanks for catching this! This time I actually tested
> changing bitrates and it shouldn't deadlock in v3. But I did notice
> sleeping while atomic warnings (even without this patchset) and decided
> to fix those in the same patchset as well.
>
> Oh, and WCN6855 firmware was also crashing whenever I tried to change
> the bitrates. But let's handle that separately.

Bah, I of course mean WCN7850. Too many chipsets...

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