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authorJens Axboe <axboe@fb.com>2017-03-30 12:30:39 -0600
committerJens Axboe <axboe@fb.com>2017-03-30 12:30:39 -0600
commitbf4907c05e615f6a1811d61c58d56da52f7e9954 (patch)
treee63fd10fd38137403a56861e03bff6f1677d1ba7 /.gitattributes
parent47d752076a92c67f548faa018efd7d4ac51f17f7 (diff)
blk-mq: fix schedule-under-preempt for blocking drivers
Commit a4d907b6a33b unified the single and multi queue request handlers, but in the process, it also screwed up the locking balance and calls blk_mq_try_issue_directly() with the ctx preempt lock held. This is a problem for drivers that have set BLK_MQ_F_BLOCKING, since now they can't reliably sleep. While in there, protect against similar issues in the future, by adding a might_sleep() trigger in the BLOCKING path for direct issue or queue run. Reported-by: Josef Bacik <josef@toxicpanda.com> Tested-by: Josef Bacik <josef@toxicpanda.com> Fixes: a4d907b6a33b ("blk-mq: streamline blk_mq_make_request") Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
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