[PATCH] ath11k: acquire ab->base_lock in unassign when finding the peer by addr

[Niels Dossche]

On 3/16/22 07:13, Kalle Valo wrote:
> Niels Dossche <dossche.niels at gmail.com> writes:
> 
>> ath11k_peer_find_by_addr states via lockdep that ab->base_lock must be
>> held when calling that function in order to protect the list. All
>> callers except ath11k_mac_op_unassign_vif_chanctx have that lock
>> acquired when calling ath11k_peer_find_by_addr. That lock is also not
>> transitively held by a path towards ath11k_mac_op_unassign_vif_chanctx.
>> The solution is to acquire the lock when calling
>> ath11k_peer_find_by_addr inside ath11k_mac_op_unassign_vif_chanctx.
>>
>> Fixes: 701e48a43e15 ("ath11k: add packet log support for QCA6390")
>> Signed-off-by: Niels Dossche <dossche.niels at gmail.com>
> 
> On what hardware and firmware version did you test this?
> 

Hi Kalle

Thanks for your reply.
I am currently working on a static analyser to detect missing locks.
This was a reported case. I manually verified the report by looking
at the code, so that I do not send wrong information or patches.
After concluding that this seems to be a true positive, I created this patch.
However, as I do not in fact have this particular hardware, I was unable to test it.

Thanks