linux-kernel - Re: [REGRESSION] wifi: brcmfmac: add firmware vendor info in driver info

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Date:   Wed, 10 May 2023 14:53:34 +0200
From:   Felix <nimrod4garoa@...il.com>
To:     Kalle Valo <kvalo@...nel.org>, Hans de Goede <hdegoede@...hat.com>
Cc:     Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        regressions@...ts.linux.dev,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com
Subject: Re: [REGRESSION] wifi: brcmfmac: add firmware vendor info in driver
 info

On Wed, 2023-05-10 at 15:09 +0300, Kalle Valo wrote:
> Hans de Goede <hdegoede@...hat.com> writes:
> 
> > On 5/10/23 10:25, Felix wrote:
> > > Changes made by the mentioned commit lead to Oops when waking up after
> > > suspend to RAM.
> > > 
> > > When waking up a Dell XPS 13 9350 with BCM4350 wifi card after suspend
> > > to RAM, the kernel hangs with a NULL pointer dereference and Oops. The
> > > issues was introduced by commit
> > > da6d9c8ecd00e20218461007948f2b0a8e7fa242 and only happens when the
> > > brcmfmac module is loaded. This issue is the reason we could not
> > > upgrade to newer kernels than the 6.1 series on the affected machine.
> > > 
> > > 
> > > Details:
> > > 
> > > On a Dell XPS 13 9350 laptop with Broadcom BCM4350 wifi card (according
> > > to lspci), every kernel starting with 6.2 hangs when waking up after
> > > suspend to RAM. The issue persisted as of May 2nd (last tested commit
> > > was 348551ddaf311c76b01cdcbaf61b6fef06a49144). Passing the debug and
> > > no_console_suspend parameters to the kernel show that a NULL pointer
> > > dereference and an Oops happen at wakeup. Please find the kernel
> > > messages readable on the screen at this point attached
> > > (kernel_log_after_suspend.txt).
> > > 
> > > A bisection was successful and produced the first bad commit
> > > [da6d9c8ecd00e20218461007948f2b0a8e7fa242] wifi: brcmfmac: add firmware
> > > vendor info in driver info
> > > I've attached the bisection log as well (bisect.txt).
> > > 
> > > Suspend to RAM works on this machine on newer kernels once the brcmfmac
> > > module is unloaded.
> > > 
> > > Distribution: Arch Linux
> > > Architecture: x86_64
> > > Device: Dell XPS 13 9350 with BCM4350 wifi card
> > > Kernel config used at compilation (created using the Arch Linux default
> > > config and make olddefconfig):
> > > https://gist.githubusercontent.com/maclomhair/e33fa7eece8f8c77e5a88c4eede2f523/raw/429dfb022498c026225865dbb3ab2f75d5030a54/config
> > > Dmesg output after boot:
> > > https://gist.githubusercontent.com/maclomhair/47c75fa759d93800e7fb5e937fabef3e/raw/10750996a1ea9dcb3fa14d9b94e11fedd3abf280/dmesg
> > > 
> > > #regzbot introduced da6d9c8ecd00e20218461007948f2b0a8e7fa242
> > 
> > Thank you for reporting this and thank you for bisecting it too!
> > 
> > As a result of your excellent bug report I've been able to write
> > a fix for this. I'm confident enough in the fix that I've submitted
> > it upstream right away.
> > 
> > But it would still be good if you can test the fix and let us know
> > if it fixes this issue for you. You should have received a copy
> > of the patch when I submitted it upstream.

I have now tested the patch you sent and it indeed fixes the issue for
me! Thank you for your quick response!


> 
> For the archives here's the patch:
> 
> https://patchwork.kernel.org/project/linux-wireless/patch/20230510100050.27099-1-hdegoede@redhat.com/
>