This patch does not change any functionality.
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
Cc: Omar Sandoval <osandov@xxxxxx>
Cc: Johannes Thumshirn <jthumshirn@xxxxxxx>
Cc: Alexandru Moise <00moses.alexander00@xxxxxxxxx>
Cc: Joseph Qi <joseph.qi@xxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
---
block/blk-core.c | 54 +++++++++++++++++++++++++++---------------------
block/blk.h | 1 +
2 files changed, 31 insertions(+), 24 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 7c65e297a4f1..5fbfa8484c95 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -719,6 +719,35 @@ void blk_set_queue_dying(struct request_queue *q)
}
EXPORT_SYMBOL_GPL(blk_set_queue_dying);
+/* Unconfigure the I/O scheduler and dissociate from the cgroup controller. */
+void blk_exit_queue(struct request_queue *q)
+{
+ /*
+ * Since the I/O scheduler exit code may access cgroup information,
+ * perform I/O scheduler exit before disassociating from the block
+ * cgroup controller.
+ */
+ if (q->elevator) {
+ ioc_clear_queue(q);
+ elevator_exit(q, q->elevator);
+ q->elevator = NULL;
+ }
+
+ /*
+ * Remove all references to @q from the block cgroup controller before
+ * restoring @q->queue_lock to avoid that restoring this pointer causes
+ * e.g. blkcg_print_blkgs() to crash.
+ */
+ blkcg_exit_queue(q);
+
+ /*
+ * Since the cgroup code may dereference the @q->backing_dev_info
+ * pointer, only decrease its reference count after having removed the
+ * association with the block cgroup controller.
+ */
+ bdi_put(q->backing_dev_info);
+}
+
/**
* blk_cleanup_queue - shutdown a request queue
* @q: request queue to shutdown
@@ -788,30 +817,7 @@ void blk_cleanup_queue(struct request_queue *q)
*/
WARN_ON_ONCE(q->kobj.state_in_sysfs);
- /*
- * Since the I/O scheduler exit code may access cgroup information,
- * perform I/O scheduler exit before disassociating from the block
- * cgroup controller.
- */
- if (q->elevator) {
- ioc_clear_queue(q);
- elevator_exit(q, q->elevator);
- q->elevator = NULL;
- }
-
- /*
- * Remove all references to @q from the block cgroup controller before
- * restoring @q->queue_lock to avoid that restoring this pointer causes
- * e.g. blkcg_print_blkgs() to crash.
- */
- blkcg_exit_queue(q);
-
- /*
- * Since the cgroup code may dereference the @q->backing_dev_info
- * pointer, only decrease its reference count after having removed the
- * association with the block cgroup controller.
- */
- bdi_put(q->backing_dev_info);
+ blk_exit_queue(q);
if (q->mq_ops)
blk_mq_free_queue(q);
diff --git a/block/blk.h b/block/blk.h
index 6adae8f94279..aeb8026f4d7b 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -130,6 +130,7 @@ void blk_free_flush_queue(struct blk_flush_queue *q);
int blk_init_rl(struct request_list *rl, struct request_queue *q,
gfp_t gfp_mask);
void blk_exit_rl(struct request_queue *q, struct request_list *rl);
+void blk_exit_queue(struct request_queue *q);
void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
struct bio *bio);
void blk_queue_bypass_start(struct request_queue *q);
--
2.18.0
