Signed-off-by: Bart Van Assche <[email protected]>
---
block/blk-core.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 8cc8006..5ecc7ab 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -689,7 +689,10 @@ void blk_freeze_queue_start(struct request_queue *q)
freeze_depth = atomic_inc_return(&q->mq_freeze_depth);
if (freeze_depth == 1) {
percpu_ref_kill(&q->q_usage_counter);
- blk_mq_run_hw_queues(q, false);
+ if (q->mq_ops)
+ blk_mq_run_hw_queues(q, false);
+ else if (q->request_fn)
+ blk_run_queue(q);
}
}
@@ -700,17 +703,11 @@ void blk_freeze_queue_wait(struct request_queue *q)
/*
* Guarantee no request is in use, so we can change any data structure of
- * the queue afterward.
+ * the queue afterward. Increases q->mq_freeze_depth and waits until
+ * q->q_usage_counter drops to zero.
*/
void blk_freeze_queue(struct request_queue *q)
{
- /*
- * In the !blk_mq case we are only calling this to kill the
- * q_usage_counter, otherwise this increases the freeze depth
- * and waits for it to return to zero. For this reason there is
- * no blk_unfreeze_queue(), and blk_freeze_queue() is not
- * exported to drivers as the only user for unfreeze is blk_mq.
- */
blk_freeze_queue_start(q);
blk_freeze_queue_wait(q);
}
--
2.10.0
--
To unsubscribe from this list: send the line "unsubscribe linux-block" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
