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authorThomas Hellstrom <thellstrom@vmware.com>2010-10-29 10:46:48 +0200
committerDave Airlie <airlied@redhat.com>2010-11-09 13:33:49 +1000
commit06fba6d4168069d818593e2fcc2d4bd0f888e97b (patch)
tree25f0d1338da8942ef54b8ab926a48c1789317eee /drivers/gpu/drm/ttm
parentdbc4a5b83585e89a6bce650d32426f61c8d4bca5 (diff)
drm/ttm: Add a barrier when unreserving
Since we're doing this outside of a spinlock to provide the necessary barriers, add an explicit barrier. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/ttm')
-rw-r--r--drivers/gpu/drm/ttm/ttm_bo.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index f561eead057d..a32fe41e5e24 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -37,6 +37,7 @@
#include <linux/mm.h>
#include <linux/file.h>
#include <linux/module.h>
+#include <asm/atomic.h>
#define TTM_ASSERT_LOCKED(param)
#define TTM_DEBUG(fmt, arg...)
@@ -444,6 +445,11 @@ static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
ttm_bo_mem_put(bo, &bo->mem);
atomic_set(&bo->reserved, 0);
+
+ /*
+ * Make processes trying to reserve really pick it up.
+ */
+ smp_mb__after_atomic_dec();
wake_up_all(&bo->event_queue);
}