[PATCH 5/6] drm/ttm: Add a barrier when unreserving

[Thomas Hellstrom]

Since we're doing this outside of a spinlock to provide the necessary
barriers, add an explicit barrier.

Signed-off-by: Thomas Hellstrom <thellstrom at vmware.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c |    6 ++++++
 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 f561eea..a32fe41 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);
 }
 
-- 
1.6.2.5