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

[Tetsuo Handa]

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 <leandro.ribeiro@xxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/drm_mode_config.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)