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17 May 2024, 11:00:25 UTC
Revision 3e6180f0c82b3790a9ec6d13d67aae359bf1ce84 authored by Christoph Hellwig on 30 April 2015, 14:10:36 UTC, committed by Mike Snitzer on 30 April 2015, 14:25:21 UTC 
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>
1 parent b787f68
History
Tip revision: 3e6180f0c82b3790a9ec6d13d67aae359bf1ce84 authored by Christoph Hellwig on 30 April 2015, 14:10:36 UTC
dm: only initialize the request_queue once
Tip revision: 3e6180f
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