[PATCH] drm/amdgpu: Skip ring soft recovery when fence parent was NULL

[wentalou]

amdgpu_ring_soft_recovery would have Call-Trace,
when s_job->s_fence->parent was NULL inside amdgpu_job_timedout.
Check parent first, as drm_sched_hw_job_reset did.

Change-Id: I0b674ffd96afd44bcefe37a66fb157b1dbba61a0
Signed-off-by: Wentao Lou <Wentao.Lou at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
index e0af44f..2945615 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
@@ -33,7 +33,7 @@ static void amdgpu_job_timedout(struct drm_sched_job *s_job)
 	struct amdgpu_ring *ring = to_amdgpu_ring(s_job->sched);
 	struct amdgpu_job *job = to_amdgpu_job(s_job);
 
-	if (amdgpu_ring_soft_recovery(ring, job->vmid, s_job->s_fence->parent)) {
+	if (s_job->s_fence->parent && amdgpu_ring_soft_recovery(ring, job->vmid, s_job->s_fence->parent)) {
 		DRM_ERROR("ring %s timeout, but soft recovered\n",
 			  s_job->sched->name);
 		return;
-- 
2.7.4