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drm/ttm: Handle in-memory region copies 

Fix the case where the ttm pointer may be NULL causing
a NULL pointer dereference.

Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Thomas Hellström <thellstrom@vmware.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Jakob Bornecrantz 2013-10-30 02:46:56 -07:00 committed by Thomas Hellstrom
parent 15205fbcbe
commit 9a0599ddea
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/ttm/ttm_bo_util.c
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@ -348,7 +348,9 @@ int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
if (old_iomap == NULL && ttm == NULL) if (old_iomap == NULL && ttm == NULL)
goto out2; goto out2;
if (ttm->state == tt_unpopulated) { /* TTM might be null for moves within the same region.
*/
if (ttm && ttm->state == tt_unpopulated) {
ret = ttm->bdev->driver->ttm_tt_populate(ttm); ret = ttm->bdev->driver->ttm_tt_populate(ttm);
if (ret) { if (ret) {
/* if we fail here don't nuke the mm node /* if we fail here don't nuke the mm node