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authorJens Axboe <axboe@fb.com>2017-04-20 17:23:13 -0600
committerJens Axboe <axboe@fb.com>2017-04-20 17:23:13 -0600
commit5feeacdd4a75bc6e5c6c613ae09ef07bc5dfd05a (patch)
treea0ee5921bc165f4680fc0afa35250217298fec48 /block
parent0206319fdfee7c36b97aa6c0561bab206132f813 (diff)
downloadlinux-5feeacdd4a75bc6e5c6c613ae09ef07bc5dfd05a.tar.bz2
blk-mq: add might_sleep check to blk_mq_get_driver_tag()
If the caller passes in wait=true, it has to be able to block for a driver tag. We just had a bug where flush insertion would block on tag allocation, while we had preempt disabled. Ensure that we catch cases like that earlier next time. Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index b6dc9ba38e35..fa7d86f59687 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -864,6 +864,8 @@ bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx,
.flags = wait ? 0 : BLK_MQ_REQ_NOWAIT,
};
+ might_sleep_if(wait);
+
if (rq->tag != -1)
goto done;