From: Michel Dänzer <[email protected]> 3.12-stable review patch. If anyone has any objections, please let me know.
=============== commit 233709d2cd6bbaaeda0aeb8d11f6ca7f98563b39 upstream. 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 <[email protected]> Signed-off-by: Michel Dänzer <[email protected]> Signed-off-by: Alex Deucher <[email protected]> Signed-off-by: Jiri Slaby <[email protected]> --- drivers/gpu/drm/radeon/radeon_gart.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c index 3b1de72b4367..2366ed0ce2b3 100644 --- a/drivers/gpu/drm/radeon/radeon_gart.c +++ b/drivers/gpu/drm/radeon/radeon_gart.c @@ -250,8 +250,10 @@ void radeon_gart_unbind(struct radeon_device *rdev, unsigned offset, } } } - mb(); - radeon_gart_tlb_flush(rdev); + if (rdev->gart.ptr) { + mb(); + radeon_gart_tlb_flush(rdev); + } } /** @@ -293,8 +295,10 @@ int radeon_gart_bind(struct radeon_device *rdev, unsigned offset, } } } - mb(); - radeon_gart_tlb_flush(rdev); + if (rdev->gart.ptr) { + mb(); + radeon_gart_tlb_flush(rdev); + } return 0; } -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
