This is a note to let you know that I've just added the patch titled drm/radeon: Don't flush the GART TLB if rdev->gart.ptr == NULL to the 3.14-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-radeon-don-t-flush-the-gart-tlb-if-rdev-gart.ptr-null.patch and it can be found in the queue-3.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 233709d2cd6bbaaeda0aeb8d11f6ca7f98563b39 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Michel=20D=C3=A4nzer?= <michel.daenzer@xxxxxxx> Date: Fri, 3 Jul 2015 10:02:27 +0900 Subject: drm/radeon: Don't flush the GART TLB if rdev->gart.ptr == NULL MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: =?UTF-8?q?Michel=20D=C3=A4nzer?= <michel.daenzer@xxxxxxx> 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 <christian.koenig@xxxxxxx> Signed-off-by: Michel Dänzer <michel.daenzer@xxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/radeon/radeon_gart.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) --- a/drivers/gpu/drm/radeon/radeon_gart.c +++ b/drivers/gpu/drm/radeon/radeon_gart.c @@ -251,8 +251,10 @@ void radeon_gart_unbind(struct radeon_de } } } - mb(); - radeon_gart_tlb_flush(rdev); + if (rdev->gart.ptr) { + mb(); + radeon_gart_tlb_flush(rdev); + } } /** @@ -294,8 +296,10 @@ int radeon_gart_bind(struct radeon_devic } } } - mb(); - radeon_gart_tlb_flush(rdev); + if (rdev->gart.ptr) { + mb(); + radeon_gart_tlb_flush(rdev); + } return 0; } Patches currently in stable-queue which might be from michel.daenzer@xxxxxxx are queue-3.14/drm-radeon-don-t-flush-the-gart-tlb-if-rdev-gart.ptr-null.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html