SRU cherry-pick request for focal and jammy

[Goffin, Henry]

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.

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>