mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-05 18:39:59 +00:00
Code Issues Releases Wiki Activity

drm/amdgpu: fence wait old rcu slot

Browse source 
since the rcu slot was initialized to be num_hw_submission,
if command submission doesn't use scheduler, this limitation
will be invalid like uvd test.

Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Chunming Zhou 2016-03-31 11:07:14 +08:00 committed by Alex Deucher
parent ab7e9c137a
commit fc387a0b18
1 changed files with 6 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
View file

@ -121,7 +121,7 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct fence **f)
{
struct amdgpu_device *adev = ring->adev;
struct amdgpu_fence *fence;
struct fence **ptr;
struct fence *old, **ptr;
uint32_t seq;
fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_KERNEL);
@ -141,7 +141,11 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct fence **f)
/* This function can't be called concurrently anyway, otherwise
* emitting the fence would mess up the hardware ring buffer.
*/
BUG_ON(rcu_dereference_protected(*ptr, 1));
old = rcu_dereference_protected(*ptr, 1);
if (old && !fence_is_signaled(old)) {
DRM_INFO("rcu slot is busy\n");
fence_wait(old, false);
}
rcu_assign_pointer(*ptr, fence_get(&fence->base));