[PATCH 07/10] bfq-iosched: fix NULL ioc check in bfq_get_rq_private
From: Christoph Hellwig <hch@lst.de>
Date: 2017-06-16 16:15:24
Subsystem:
bfq i/o scheduler, block layer, the rest · Maintainers:
Yu Kuai, Jens Axboe, Linus Torvalds
icq_to_bic is a container_of operation, so we need to check for NULL before it. Also move the check outside the spinlock while we're at it. Signed-off-by: Christoph Hellwig <hch@lst.de> --- block/bfq-iosched.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-)
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 4f69e39c2f89..f037b005faa1 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c@@ -4398,16 +4398,17 @@ static int bfq_get_rq_private(struct request_queue *q, struct request *rq, struct bio *bio) { struct bfq_data *bfqd = q->elevator->elevator_data; - struct bfq_io_cq *bic = icq_to_bic(rq->elv.icq); + struct bfq_io_cq *bic; const int is_sync = rq_is_sync(rq); struct bfq_queue *bfqq; bool new_queue = false; bool split = false; - spin_lock_irq(&bfqd->lock); + if (!rq->elv.icq) + return 1; + bic = icq_to_bic(rq->elv.icq); - if (!bic) - goto queue_fail; + spin_lock_irq(&bfqd->lock); bfq_check_ioprio_change(bic, bio);
@@ -4465,13 +4466,7 @@ static int bfq_get_rq_private(struct request_queue *q, struct request *rq, bfq_handle_burst(bfqd, bfqq); spin_unlock_irq(&bfqd->lock); - return 0; - -queue_fail: - spin_unlock_irq(&bfqd->lock); - - return 1; } static void bfq_idle_slice_timer_body(struct bfq_queue *bfqq)
--
2.11.0