diff options
| author | Jens Axboe <axboe@kernel.dk> | 2018-11-21 05:12:46 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-11-21 05:12:46 +0300 |
| commit | 0c62bff1fd633774756be6d88d71002cd37615e0 (patch) | |
| tree | 1a121675ee9e6a9459681665d41450f4b5e28312 /block/blk-mq-sched.c | |
| parent | 20578bdfd0418efb11ec316229e670d085cd574a (diff) | |
| download | linux-0c62bff1fd633774756be6d88d71002cd37615e0.tar.xz | |
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 <ming.lei@redhat.com>
Tested-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq-sched.c')
| -rw-r--r-- | block/blk-mq-sched.c | 9 |
1 files changed, 8 insertions, 1 deletions
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); |