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blkcg: don't call into policy draining if root_blkg is already gone
[firefly-linux-kernel-4.4.55.git]
/
block
/
blk-cgroup.c
diff --git
a/block/blk-cgroup.c
b/block/blk-cgroup.c
index b9f4cc494ecefbf2560483bdc4685bb98d59b5d3..28d227c5ca7781aed5bb15cf37d3b0f1dcaa8d79 100644
(file)
--- a/
block/blk-cgroup.c
+++ b/
block/blk-cgroup.c
@@
-872,6
+872,13
@@
void blkcg_drain_queue(struct request_queue *q)
{
lockdep_assert_held(q->queue_lock);
+ /*
+ * @q could be exiting and already have destroyed all blkgs as
+ * indicated by NULL root_blkg. If so, don't confuse policies.
+ */
+ if (!q->root_blkg)
+ return;
+
blk_throtl_drain(q);
}