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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: 84ec374bd5
("drm/amdgpu: create amdgpu_vkms (v4)")
Cc: stable@vger.kernel.org # 5.15.x
Cc: hgoffin@amazon.com
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
036341b374
commit
15a507a693
1 changed files with 2 additions and 1 deletions
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@ -341,7 +341,8 @@ int amdgpu_fbdev_init(struct amdgpu_device *adev)
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}
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/* disable all the possible outputs/crtcs before entering KMS mode */
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if (!amdgpu_device_has_dc_support(adev) && !amdgpu_virtual_display)
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if (!amdgpu_device_has_dc_support(adev) && !amdgpu_virtual_display &&
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!amdgpu_sriov_vf(adev))
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drm_helper_disable_unused_functions(adev_to_drm(adev));
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drm_fb_helper_initial_config(&rfbdev->helper, bpp_sel);
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