This is a note to let you know that I've just added the patch titled drm/amdgpu: fix check in fbdev init to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-amdgpu-fix-check-in-fbdev-init.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From git@z Thu Jan 1 00:00:00 1970 From: Alex Deucher <alexander.deucher@xxxxxxx> Date: Tue, 19 Jul 2022 14:56:59 -0400 Subject: drm/amdgpu: fix check in fbdev init To: <stable@xxxxxxxxxxxxxxx> Cc: <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>, Alex Deucher <alexander.deucher@xxxxxxx>, <hgoffin@xxxxxxxxxx> Message-ID: <20220719185659.2068735-1-alexander.deucher@xxxxxxx> From: Alex Deucher <alexander.deucher@xxxxxxx> 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@xxxxxxxxxxxxxxx # 5.15.x Cc: hgoffin@xxxxxxxxxx Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c @@ -341,7 +341,8 @@ int amdgpu_fbdev_init(struct amdgpu_devi } /* disable all the possible outputs/crtcs before entering KMS mode */ - if (!amdgpu_device_has_dc_support(adev) && !amdgpu_virtual_display) + if (!amdgpu_device_has_dc_support(adev) && !amdgpu_virtual_display && + !amdgpu_sriov_vf(adev)) drm_helper_disable_unused_functions(adev_to_drm(adev)); drm_fb_helper_initial_config(&rfbdev->helper, bpp_sel); Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are queue-5.15/drm-amdgpu-fix-check-in-fbdev-init.patch queue-5.15/drm-amdgpu-check-bo-s-requested-pinning-domains-against-its-preferred_domains.patch