drm/amdkfd: Fix rescheduling of restore worker

Handle the case that the restore worker was already scheduled by another
eviction while the restore was in progress.

Fixes: 9a1c133 ("drm/amdkfd: Run restore_workers on freezable WQs")
Signed-off-by: Felix Kuehling <[email protected]>
Reviewed-by: Philip Yang <[email protected]>
Tested-by: Yunxiang Li <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Cc: [email protected]

Author: fxkamd

drivers/gpu/drm/amd/amdkfd/kfd_process.c

@@ -2012,9 +2012,9 @@ static void restore_process_worker(struct work_struct *work)
 	if (ret) {
 		pr_debug("Failed to restore BOs of pasid 0x%x, retry after %d ms\n",
 			 p->pasid, PROCESS_BACK_OFF_TIME_MS);
-		ret = queue_delayed_work(kfd_restore_wq, &p->restore_work,
-				msecs_to_jiffies(PROCESS_BACK_OFF_TIME_MS));
-		WARN(!ret, "reschedule restore work failed\n");
+		if (mod_delayed_work(kfd_restore_wq, &p->restore_work,
+				     msecs_to_jiffies(PROCESS_RESTORE_TIME_MS)))
+			kfd_process_restore_queues(p);
 	}
 }