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authorJens Axboe <axboe@kernel.dk>2018-11-20 19:12:46 -0700
committerJens Axboe <axboe@kernel.dk>2018-11-20 19:12:46 -0700
commit0c62bff1fd633774756be6d88d71002cd37615e0 (patch)
tree1a121675ee9e6a9459681665d41450f4b5e28312 /block/blk-mq-sched.c
parent20578bdfd0418efb11ec316229e670d085cd574a (diff)
downloadlinux-0c62bff1fd633774756be6d88d71002cd37615e0.tar.bz2
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.c9
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);