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drm/amdgpu: check before checking pci bridge registers 

Make sure we are not the root device before attempting to
read the pcie bridge registers to check the pcie gen speeed.

Fixes a crash when the device is passed through to a VM.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2015-10-06 09:38:45 -04:00
parent 26d0c21db1
commit e79d5c0870
2 changed files with 6 additions and 0 deletions
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3
drivers/gpu/drm/amd/amdgpu/cik.c
View File

@ -1567,6 +1567,9 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev)
int ret, i;
u16 tmp16;
if (pci_is_root_bus(adev->pdev->bus))
return;
if (amdgpu_pcie_gen2 == 0)
return;

3
drivers/gpu/drm/amd/amdgpu/vi.c
View File

@ -1005,6 +1005,9 @@ static void vi_pcie_gen3_enable(struct amdgpu_device *adev)
u32 mask;
int ret;
if (pci_is_root_bus(adev->pdev->bus))
return;
if (amdgpu_pcie_gen2 == 0)
return;