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vmwgfx: Allow reference and unreference of NULL fence objects.

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The execbuf utils may call reference on NULL fence objects.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Thomas Hellstrom 2011-10-04 20:13:29 +02:00 committed by Dave Airlie
parent b37a6b9ad0
commit e93daed8e2
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
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@ -177,6 +177,9 @@ static int vmw_fence_obj_init(struct vmw_fence_manager *fman,
struct vmw_fence_obj *vmw_fence_obj_reference(struct vmw_fence_obj *fence)
{
if (unlikely(fence == NULL))
return NULL;
kref_get(&fence->kref);
return fence;
}
@ -191,8 +194,12 @@ struct vmw_fence_obj *vmw_fence_obj_reference(struct vmw_fence_obj *fence)
void vmw_fence_obj_unreference(struct vmw_fence_obj **fence_p)
{
struct vmw_fence_obj *fence = *fence_p;
struct vmw_fence_manager *fman = fence->fman;
struct vmw_fence_manager *fman;
if (unlikely(fence == NULL))
return;
fman = fence->fman;
*fence_p = NULL;
spin_lock_irq(&fman->lock);
BUG_ON(atomic_read(&fence->kref.refcount) == 0);