cciss: Fix usage_count check in rebuild_lun_table when triggered via sysfs.
When rebuild_lun_table is reached via sysfs, the usage count that is checked prior to messing with c0d0 has different constraints (must be zero) than if rebuild_lun_table is reached via ioctl (must be one.) Fix rebuild_lun_table to take that into account. Signed-off-by: NStephen M. Cameron <scameron@beardog.cce.hp.com> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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