diff options
| author | Thomas Hellstrom <thellstrom@vmware.com> | 2011-10-04 22:13:29 +0400 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2011-10-05 13:17:21 +0400 |
| commit | e93daed8e2fd5ce3dc98efe9938426127a534ccc (patch) | |
| tree | 17414286b33992253ddbe04bd84c797342af01f8 /drivers/gpu/drm/vmwgfx/vmwgfx_fence.c | |
| parent | b37a6b9ad002a6c123a6924668dfef5c5fb0b700 (diff) | |
| download | linux-e93daed8e2fd5ce3dc98efe9938426127a534ccc.tar.xz | |
vmwgfx: Allow reference and unreference of NULL fence objects.
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>
Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_fence.c')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_fence.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c index 5065a140fdf8..5f60be76166e 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c @@ -177,6 +177,9 @@ out_unlock: 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); |