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| author | Christian König <christian.koenig@amd.com> | 2015-03-31 17:36:57 +0200 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2015-04-02 16:03:29 +0200 |
| commit | 863653fed0f449fb738295255cc834b271cfa088 (patch) | |
| tree | 655d4ce062c70dcc6dee18bd2d0fe3b99b24433a | |
| parent | Merge branch 'drm-fixes-4.0' of git://people.freedesktop.org/~agd5f/linux int... (diff) | |
| download | linux-863653fed0f449fb738295255cc834b271cfa088.tar.xz linux-863653fed0f449fb738295255cc834b271cfa088.zip | |
drm/radeon: add extra check in radeon_ttm_tt_unpin_userptr
We somehow try to free the SG table twice.
Bugs: https://bugs.freedesktop.org/show_bug.cgi?id=89734
Signed-off-by: Christian König <christian.koenig@amd.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_ttm.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c index d02aa1d0f588..b292aca0f342 100644 --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -598,6 +598,10 @@ static void radeon_ttm_tt_unpin_userptr(struct ttm_tt *ttm) enum dma_data_direction direction = write ? DMA_BIDIRECTIONAL : DMA_TO_DEVICE; + /* double check that we don't free the table twice */ + if (!ttm->sg->sgl) + return; + /* free the sg table and pages again */ dma_unmap_sg(rdev->dev, ttm->sg->sgl, ttm->sg->nents, direction); |