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blk-mq: prevent unmapped hw queue from being scheduled
authorMing Lei <ming.lei@canonical.com>
Wed, 3 Dec 2014 11:38:04 +0000 (19:38 +0800)
committerJens Axboe <axboe@fb.com>
Tue, 9 Dec 2014 04:37:08 +0000 (21:37 -0700)
When one hardware queue has no mapped software queues, it
shouldn't have been scheduled. Otherwise WARNING or OOPS
can triggered.

blk_mq_hw_queue_mapped() helper is introduce for fixing
the problem.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

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