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drm/amdgpu: do necessary NULL check 

Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Jammy Zhou 2015-05-12 23:17:19 +08:00 committed by Alex Deucher
parent 02b70c8c9f
commit 4b095304ea
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
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@ -101,6 +101,9 @@ int amdgpu_sync_resv(struct amdgpu_device *adev,
unsigned i;
int r = 0;
if (resv == NULL)
return -EINVAL;
/* always sync to the exclusive fence */
f = reservation_object_get_excl(resv);
fence = f ? to_amdgpu_fence(f) : NULL;
@ -116,12 +119,12 @@ int amdgpu_sync_resv(struct amdgpu_device *adev,
for (i = 0; i < flist->shared_count; ++i) {
f = rcu_dereference_protected(flist->shared[i],
reservation_object_held(resv));
fence = to_amdgpu_fence(f);
fence = f ? to_amdgpu_fence(f) : NULL;
if (fence && fence->ring->adev == adev) {
if (fence->owner != owner ||
fence->owner == AMDGPU_FENCE_OWNER_UNDEFINED)
amdgpu_sync_fence(sync, fence);
} else {
} else if (f) {
r = fence_wait(f, true);
if (r)
break;