From 0c62bff1fd633774756be6d88d71002cd37615e0 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 20 Nov 2018 19:12:46 -0700 Subject: [PATCH] block: fix attempt to assign NULL io_context If the first request allocated and issued by a process is a passhthrough request, we don't set up an IO context for it. Ensure that blk_mq_sched_assign_ioc() ignores a NULL io_context. Fixes: e2b3fa5af70c ("block: Remove bio->bi_ioc") Reported-by: Ming Lei Tested-by: Ming Lei Signed-off-by: Jens Axboe --- block/blk-mq-sched.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c index 13b8dc332541..f096d8989773 100644 --- a/block/blk-mq-sched.c +++ b/block/blk-mq-sched.c @@ -34,9 +34,16 @@ EXPORT_SYMBOL_GPL(blk_mq_sched_free_hctx_data); void blk_mq_sched_assign_ioc(struct request *rq) { struct request_queue *q = rq->q; - struct io_context *ioc = current->io_context; + struct io_context *ioc; struct io_cq *icq; + /* + * May not have an IO context if it's a passthrough request + */ + ioc = current->io_context; + if (!ioc) + return; + spin_lock_irq(&q->queue_lock); icq = ioc_lookup_icq(ioc, q); spin_unlock_irq(&q->queue_lock); -- 2.30.2