drm/etnaviv: Protect the scheduler's pending list with its lock

Commit 704d3d6 ("drm/etnaviv: don't block scheduler when GPU is still
active") ensured that active jobs are returned to the pending list when
extending the timeout. However, it didn't use the pending list's lock to
manipulate the list, which causes a race condition as the scheduler's
workqueues are running.

Hold the lock while manipulating the scheduler's pending list to prevent
a race.

Cc: [email protected]
Fixes: 704d3d6 ("drm/etnaviv: don't block scheduler when GPU is still active")
Reported-by: Philipp Stanner <[email protected]>
Closes: https://lore.kernel.org/dri-devel/[email protected]/
Reviewed-by: Lucas Stach <[email protected]>
Reviewed-by: Philipp Stanner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Maíra Canal <[email protected]>

Author: mairacanal

drivers/gpu/drm/etnaviv/etnaviv_sched.c

@@ -35,6 +35,7 @@ static enum drm_gpu_sched_stat etnaviv_sched_timedout_job(struct drm_sched_job
 							  *sched_job)
 {
 	struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
+	struct drm_gpu_scheduler *sched = sched_job->sched;
 	struct etnaviv_gpu *gpu = submit->gpu;
 	u32 dma_addr, primid = 0;
 	int change;
@@ -89,7 +90,9 @@ static enum drm_gpu_sched_stat etnaviv_sched_timedout_job(struct drm_sched_job
 	return DRM_GPU_SCHED_STAT_NOMINAL;
 
 out_no_timeout:
-	list_add(&sched_job->list, &sched_job->sched->pending_list);
+	spin_lock(&sched->job_list_lock);
+	list_add(&sched_job->list, &sched->pending_list);
+	spin_unlock(&sched->job_list_lock);
 	return DRM_GPU_SCHED_STAT_NOMINAL;
 }