From: Christoph Hellwig Date: Fri, 16 Jun 2017 16:15:24 +0000 (+0200) Subject: bfq-iosched: fix NULL ioc check in bfq_get_rq_private X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9f2107382636cf9a71951eb71ec04f2fb3641b37;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git bfq-iosched: fix NULL ioc check in bfq_get_rq_private 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 Signed-off-by: Jens Axboe --- 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)