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

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Date: Mon, 8 Apr 2024 06:33:56 -0700
From: Breno Leitao <leitao@...ian.org>
To: Kalle Valo <kvalo@...nel.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

Hello Kalle,

On Fri, Apr 05, 2024 at 06:15:05PM +0300, Kalle Valo wrote:
> Breno Leitao <leitao@...ian.org> writes:
> 
> > struct net_device shouldn't be embedded into any structure, instead,
> > the owner should use the private space to embed their state into
> > net_device.
> >
> > This patch set fixes the problem above for ath10k and ath11k. This also
> > fixes the conversion of qtnfmac driver to the new helper.
> >
> > This patch set depends on a series that is still under review:
> > https://lore.kernel.org/all/20240404114854.2498663-1-leitao@debian.org/#t
> >
> > If it helps, I've pushed the tree to
> > https://github.com/leitao/linux/tree/wireless-dummy
> >
> > PS: Due to lack of hardware, unfortunately all these patches are
> > compiled tested only.
> >
> > Breno Leitao (3):
> >   wifi: qtnfmac: Use netdev dummy allocator helper
> >   wifi: ath10k: allocate dummy net_device dynamically
> >   wifi: ath11k: allocate dummy net_device dynamically
> 
> Thanks for setting up the branch, that makes the testing very easy. I
> now tested the branch using the commit below with ath11k WCN6855 hw2.0
> on an x86 box:
> 
> 5be9a125d8e7 wifi: ath11k: allocate dummy net_device dynamically
> 
> But unfortunately it crashes, the stack trace below. I can easily test
> your branches, just let me know what to test. A direct 'git pull'
> command is the best.

Thanks for the test.

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

PS: I didn't updated the other drivers (ath10k, qtnfmac, etc).

Thank you!