tree 915d744586cc97daa7467f41bcf90c40ed726336
parent 5dfc71bc44d91d1620505c064fa22b0b3db58a9d
author Michel Dänzer <michel.daenzer@amd.com> 1435885347 +0900
committer Alex Deucher <alexander.deucher@amd.com> 1437064777 -0400

drm/radeon: Don't flush the GART TLB if rdev->gart.ptr == NULL

This can be the case when the GPU is powered off, e.g. via vgaswitcheroo
or runpm. When the GPU is powered up again, radeon_gart_table_vram_pin
flushes the TLB after setting rdev->gart.ptr to non-NULL.

Fixes panic on powering off R7xx GPUs.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61529
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org