linux-kernel - Re: [PATCH] drm/nouveau: check ioctl command codes better

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Message-ID: <2e94329d-04c7-4cd5-bce4-235a81db214b@dakr.org>
Date: Tue, 22 Jul 2025 13:45:41 +0200
From: Danilo Krummrich <kernel@...r.org>
To: Arnd Bergmann <arnd@...db.de>, Satadru Pramanik <satadru@...il.com>
Cc: Chris Bainbridge <chris.bainbridge@...il.com>,
 Arnd Bergmann <arnd@...nel.org>, Dave Airlie <airlied@...il.com>,
 Dave Airlie <airlied@...hat.com>, Ben Skeggs <bskeggs@...dia.com>,
 "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
 open list <linux-kernel@...r.kernel.org>, Lyude Paul <lyude@...hat.com>,
 "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
 Simona Vetter <simona@...ll.ch>, Timur Tabi <ttabi@...dia.com>,
 Thomas Zimmermann <tzimmermann@...e.de>, regressions@...ts.linux.dev
Subject: Re: [PATCH] drm/nouveau: check ioctl command codes better

On 7/22/25 12:52 PM, Arnd Bergmann wrote:
> On Tue, Jul 22, 2025, at 12:29, Chris Bainbridge wrote:
>> On Mon, Jul 21, 2025 at 08:22:48AM -0400, Satadru Pramanik wrote:
>>> Hello all,
>>>
>>> I suspect this commit in 6.16-rc7 has broken acceleration with Mesa's
>>> nouveau drivers on my machine.

Thanks for the report!

Please make sure to keep maintainers in the loop, for some reason I was removed
from the recipient list for this regression report.

>>>
>>> glxinfo -B reports that I'm using llvmpipe.
>>>
>>> Reverting this in 6.16-rc7 restores nouveau acceleration, and glxinfo
>>> then reports: "OpenGL renderer string: NVE7"
>>
>> I also bisected an issue to this commit. On my laptop, this commit
>> results in an intermittent desktop crash (Xorg segfault) when changing
>> display scale, which can be more reliably reproduced with:
>>
>> for x in {1..100}; do
>>    xrandr --output eDP-1 --mode 2560x1600 --scale 0.5 --filter nearest
>>    xrandr --output eDP-1 --mode 2560x1600 --scale 1 --filter nearest
>> done
>>
> 
> I won't have time to work on fixing my patch before the merge window,
> let's just revert it.

@Arnd: Yes, given the short timeframe I think that's the best. Can you please 
send the revert?