APPLIED[J]/Cmnt: SRU cherry-pick request for focal and jammy

[Stefan Bader]

On 14.09.22 22:42, Goffin, Henry wrote:
> Hello,
> 
> When transitioning from kernel 5.13 to 5.15 as a security channel update, Focal suffered a kernel regression which broke amdgpu module support on Amazon Web Services cloud hardware. An upstream fix was accepted some months ago but has been stalled in the pipe. It would be greatly appreciated if the patch could be accelerated for Ubuntu 5.15 kernels ASAP, particularly Focal where it has been causing breakage as existing AWS customer applications apply security updates.

Hi Henry,

normally we would be set to start the next cycle by next week. This would delay 
everything by 3 weeks. But since this is in upstream stable and just one release 
past the required one we went ahead and just picked that one patch ahead of 
time. It should now be part of next cycle for the 22.04/jammy kernel which is 
the base for all the 5.15 based Ubuntu kernels. So this should be present in all 
5.15 focal cloud kernels as well.

-Stefan

> 
> Thank you for your attention!
> 
> -henry goffin
> 
>   
> https://bugs.launchpad.net/ubuntu/+source/linux-aws-5.15/+bug/1981883
> 
> https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.61
> 
> commit 27f8f5219fe4658537ba28fd01657e1062ac3960
> Author: Alex Deucher <alexander.deucher at amd.com>
> Date:   Tue Jul 19 14:56:59 2022 -0400
> 
>      drm/amdgpu: fix check in fbdev init
>      
>      The new vkms virtual display code is atomic so there is
>      no need to call drm_helper_disable_unused_functions()
>      when it is enabled.  Doing so can result in a segfault.
>      When the driver switched from the old virtual display code
>      to the new atomic virtual display code, it was missed that
>      we enable virtual display unconditionally under SR-IOV
>      so the checks here missed that case.  Add the missing
>      check for SR-IOV.
>      
>      There is no equivalent of this patch for Linus' tree
>      because the relevant code no longer exists.  This patch
>      is only relevant to kernels 5.15 and 5.16.
>      
>      Fixes: 84ec374bd580 ("drm/amdgpu: create amdgpu_vkms (v4)")
>      Cc: stable at vger.kernel.org # 5.15.x
>      Cc: hgoffin at amazon.com
>      Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
>      Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
> 
> 

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