drm/xe: Take job list lock in xe_sched_first_pending_job

Access to the pending_list should always happens under job_list_lock.

Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241105160327.2970277-1-nirmoy.das@intel.com
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>

diff --git a/drivers/gpu/drm/xe/xe_gpu_scheduler.h b/drivers/gpu/drm/xe/xe_gpu_scheduler.h
index 64b2ae6..c250ea7 100644 (file)
--- a/drivers/gpu/drm/xe/xe_gpu_scheduler.h
+++ b/drivers/gpu/drm/xe/xe_gpu_scheduler.h
@@ -71,8 +71,14 @@ static inline void xe_sched_add_pending_job(struct xe_gpu_scheduler *sched,
 static inline
 struct xe_sched_job *xe_sched_first_pending_job(struct xe_gpu_scheduler *sched)
 {
-       return list_first_entry_or_null(&sched->base.pending_list,
-                                       struct xe_sched_job, drm.list);
+       struct xe_sched_job *job;
+
+       spin_lock(&sched->base.job_list_lock);
+       job = list_first_entry_or_null(&sched->base.pending_list,
+                                      struct xe_sched_job, drm.list);
+       spin_unlock(&sched->base.job_list_lock);
+
+       return job;
 }
 
 static inline int