Re: [PATCH v2 1/1] drm: use drm_warn() in validate_blend_mode_for_alpha_formats()

Merge window will open shortly. Can we have this fix applied before
commit 860e748bddcc ("drm: ensure blend mode supported if pixel format
with alpha exposed") hits upstream?

On 2026/08/06 22:14, Tetsuo Handa wrote:
> Who is supposed to take this patch?
> 
> Since this problem is preventing syzbot from testing changes in linux-next
> kernels for more than three weeks, I expect this patch to be applied
> as soon as possible.
> 
> On 2026/08/01 0:42, Leandro Ribeiro wrote:
>> Commit 860e748bddcc ("drm: ensure blend mode supported if pixel format
>> with alpha exposed") introduced a WARN() to let driver developers know
>> that a previously valid behavior should now be changed.
>>
>> But WARN() should not be used for that, as it's a kernel warning report
>> mechanism for conditions that are not expected to happen. It also
>> produces a stack trace. Instead, a simple warning-level log message
>> should have been used, as drivers were expected to trigger the
>> condition.
>>
>> This is causing problems for fuzzers, as they may stop when encountering
>> a "BUG:" or "WARNING:" in the logs.
>>
>> Replace WARN() with drm_warn() in this function, avoiding these issues.
>>
>> Fixes: 860e748bddcc ("drm: ensure blend mode supported if pixel format with alpha exposed")
>> Signed-off-by: Leandro Ribeiro <[email protected]>
>> ---
>>  drivers/gpu/drm/drm_mode_config.c | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)