If a tag is freed, the request might be used very soon. There is a short window rq->q is null, so cache it.
Signed-off-by: Shaohua Li <[email protected]> --- block/blk-mq.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: master/block/blk-mq.c =================================================================== --- master.orig/block/blk-mq.c 2013-10-11 12:07:32.282133638 +0800 +++ master/block/blk-mq.c 2013-10-11 12:07:32.282133638 +0800 @@ -250,11 +250,12 @@ static void __blk_mq_free_request(struct struct blk_mq_ctx *ctx, struct request *rq) { const int tag = rq->tag; + struct request_queue *q = rq->q; blk_mq_rq_init(hctx, rq); blk_mq_put_tag(hctx->tags, tag); - blk_mq_queue_exit(rq->q); + blk_mq_queue_exit(q); } void blk_mq_free_request(struct request *rq) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
