drm/amdgpu: add check for callback

it is possible that the callback isn't defined sometimes.

Signed-off-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Christian K?nig <christian.koenig@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 9ff4d27..c41360e 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -137,7 +137,8 @@ static void amdgpu_job_work_func(struct work_struct *work)
                container_of(work, struct amdgpu_cs_parser,
                             job_work);
        mutex_lock(&sched_job->job_lock);
-       sched_job->free_job(sched_job);
+       if (sched_job->free_job)
+               sched_job->free_job(sched_job);
        mutex_unlock(&sched_job->job_lock);
        /* after processing job, free memory */
        kfree(sched_job);