netdev - Re: [PATCH 0/3] wifi: Un-embed ath10k and ath11k dummy netdev

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Message-ID: <87edbe26qe.fsf@kernel.org>
Date: Tue, 09 Apr 2024 13:03:21 +0300
From: Kalle Valo <kvalo@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: kuba@...nel.org,  ath11k@...ts.infradead.org,
  ath10k@...ts.infradead.org,  linux-wireless@...r.kernel.org,
  imitsyanko@...ntenna.com,  geomatsi@...il.com,
  linux-kernel@...r.kernel.org,  netdev@...r.kernel.org
Subject: Re: [PATCH 0/3] wifi: Un-embed ath10k and ath11k dummy netdev

Breno Leitao <leitao@...ian.org> writes:

>> > Reading the issue, I am afraid that freeing netdev explicitly
>> > (free_netdev()) might not be the best approach at the exit path.
>> >
>> > I would like to try to leverage the ->needs_free_netdev netdev
>> > mechanism to do the clean-up, if that makes sense. I've updated the
>> > ath11k patch, and I am curious if that is what we want.
>> >
>> > Would you mind testing a net patch I have, please?
>> >
>> >   https://github.com/leitao/linux/tree/wireless-dummy_v2
>> 
>> I tested this again with my WCN6855 hw2.0 x86 test box on this commit:
>> 
>> a87674ac820e wifi: ath11k: allocate dummy net_device dynamically
>> 
>> It passes my tests and doesn't crash, but I see this kmemleak warning a
>> lot:
>
> Thanks Kalle, that was helpful. The device is not being clean-up
> automatically.
>
> Chatting with Jakub, he suggested coming back to the original approach,
> but, adding a additional patch, at the free_netdev().
>
> Would you mind running another test, please?
>
> 	https://github.com/leitao/linux/tree/wireless-dummy_v3
>
> The branch above is basically the original branch (as in this patch
> series), with this additional patch:
>
> 	Author: Breno Leitao <leitao@...ian.org>
> 	Date:   Mon Apr 8 11:37:32 2024 -0700
>
> 	    net: free_netdev: exit earlier if dummy

I tested with the same ath11k hardware and this one passes all my
(simple) ath11k tests, no issues found. I used this commit:

1c10aebaa8ce net: free_netdev: exit earlier if dummy

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