Commit 5feeacdd authored by Jens Axboe's avatar Jens Axboe

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: default avatarBart Van Assche <Bart.VanAssche@sandisk.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 0206319f
......@@ -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;
......
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