Re: [PATCHv2 for 6.112 and 6.6 0/2] amdgpu: fix panic on old GPUs

["Timur Kristóf" <timur.kristof@gmail.com>]

On Wednesday, March 4, 2026 9:10:02 AM Central European Standard Time 
Christian König wrote:
> -stable +Greg
> 
> On 3/4/26 05:03, Rosen Penev wrote:
> > On Fri, Feb 27, 2026 at 8:54 PM Rosen Penev <rosenp@gmail.com> wrote:
> >> Because of incomplete backports to stable kernels, DC ended up breaking
> >> on older GCN 1 GPUs. This patchset adds the missing upstream commits to
> >> at least fix the panic/black screen on boot.
> >> 
> >> They are applicable to 6.12, 6.6, and 6.1 as those are the currently
> >> supported kernels that 7009e3af0474aca5f64262b3c72fb6e23b232f9b got
> >> backported to.
> >> 
> >> 6.1 needs two extra backports for these two commits to be cherry-picked
> >> cleanly. Those are
> >> 
> >> 96ce96f8773da4814622fd97e5226915a2c30706
> >> d09ef243035b75a6d403ebfeb7e87fa20d7e25c6
> >> 
> >> v2: Add Signed-off-by.
> > 
> > Do I need to resend?
> 
> Well first of all please stop sending those patches at all.
> 
> When you want something backported then add the CC: stable tag to the
> original patch.
> 
> If you find that some patch is already upstream which isn't correctly tagged
> then ping the relevant maintainers if that patch can be backported.
> 
> But don't send stuff to the stable list all by yourself.
> 
> Regards,
> Christian.

Hi Everyone,

The patches actually come from a branch of mine:
https://gitlab.freedesktop.org/Venemo/linux/-/commits/v6.12.74_si_dc_fixes

For context:

The crash comes from a patch that I wrote for 6.18 that fixes some issues on 
the default, non-DC code path, that was backported to stable kernels. DC was 
not the default code path before Linux 6.19, so I didn't mark the patches that 
also fix DC for backporting, because I had assumed nobody uses the DC code path 
on these kernel versions.

After a user reported to me that this causes issues for him with DC on 6.17 
and older kernels, I sent a backported series to Greg and Sasha, in an email 
thread with the subject line "Fixing an amdgpu crash caused by a backported 
patch". The fixes were backported to 6.17 then.

I assumed that the stable maintainers would backport the fixes to all older 
kernels that were also affected, but Rosen brought it to my attention that it 
didn't happen. So I made the backports in the above branch. Rosen then decided 
to send them to the mailing list.

Hope that helps clear up the situation.

Thanks & best regards,
Timur