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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>
This commit is contained in:
Thomas Hellstrom 2010-10-29 10:46:48 +02:00 committed by Dave Airlie
parent dbc4a5b835
commit 06fba6d416
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/ttm/ttm_bo.c
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@ -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);
}