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authorChristoph Hellwig <hch@lst.de>2015-04-30 10:10:36 -0400
committerMike Snitzer <snitzer@redhat.com>2015-04-30 10:25:21 -0400
commit3e6180f0c82b3790a9ec6d13d67aae359bf1ce84 (patch)
treec4abf15202b194c0762f97af185e4b40387413ac /init
parentb787f68c36d49bb1d9236f403813641efa74a031 (diff)
downloadlinux-3e6180f0c82b3790a9ec6d13d67aae359bf1ce84.tar.gz
dm: only initialize the request_queue once
Commit bfebd1cdb4 ("dm: add full blk-mq support to request-based DM") didn't properly account for the need to short-circuit re-initializing DM's blk-mq request_queue if it was already initialized. Otherwise, reloading a blk-mq request-based DM table (either manually or via multipathd) resulted in errors, see: https://www.redhat.com/archives/dm-devel/2015-April/msg00132.html Fix is to only initialize the request_queue on the initial table load (when the mapped_device type is assigned). This is better than having dm_init_request_based_blk_mq_queue() return early if the queue was already initialized because it elevates the constraint to a more meaningful location in DM core. As such the pre-existing early return in dm_init_request_based_queue() can now be removed. Fixes: bfebd1cdb4 ("dm: add full blk-mq support to request-based DM") Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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