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(parent: 3c94d83) | patch
blk-mq: enable IO poll if .nr_queues of type poll > 0
authorMing Lei <ming.lei@redhat.com>
Tue, 18 Dec 2018 04:15:29 +0000 (12:15 +0800)
committerJens Axboe <axboe@kernel.dk>
Tue, 18 Dec 2018 04:35:07 +0000 (21:35 -0700)
commitcd19181bf9ad4b7f40f2a4e0355d052109c76529
tree30896b4375d72ec6097eedfebaf193b368d9db0etree | snapshot
parent3c94d83cb352627f221d971b05f163c17527de74commit | diff
blk-mq: enable IO poll if .nr_queues of type poll > 0

The queue mapping of type poll only exists when set->map[HCTX_TYPE_POLL].nr_queues
is bigger than zero, so enhance the constraint by checking .nr_queues of type poll
before enabling IO poll.

Otherwise IO race & timeout can be observed when running block/007.

Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
block/blk-mq.c diff | blob | history
block/blk-sysfs.c diff | blob | history
ep93xx device tree rework repo: git://git.maquefel.me/linux.git