Hannes Reinecke 6c182cd88d
dm mpath: fix ioctl deadlock when no paths ...
When multipath needs to retry an ioctl the reference to the
current live table needs to be dropped. Otherwise a deadlock
occurs when all paths are down:
- dm_blk_ioctl takes a reference to the current table
and spins in multipath_ioctl().
- A new table is being loaded, but upon resume the process
hangs in dm_table_destroy() waiting for references to
drop to zero.
With this patch the reference to the old table is dropped
prior to retry, thereby avoiding the deadlock.
Signed-off-by: Hannes Reinecke <hare@suse.de >
Cc: Mike Snitzer <snitzer@redhat.com >
Cc: stable@vger.kernel.org
Signed-off-by: Alasdair G Kergon <agk@redhat.com >
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