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scsi: libsas: always unregister the old device if going to discover new 

If we went into sas_rediscover_dev() the attached_sas_addr was already insured
not to be zero. So it's unnecessary to check if the attached_sas_addr is zero.

And although if the sas address is not changed, we always have to unregister
the old device when we are going to register a new one. We cannot just leave
the device there and bring up the new.

Signed-off-by: Jason Yan <yanaijie@huawei.com>
CC: chenxiang <chenxiang66@hisilicon.com>
CC: John Garry <john.garry@huawei.com>
CC: Johannes Thumshirn <jthumshirn@suse.de>
CC: Ewan Milne <emilne@redhat.com>
CC: Christoph Hellwig <hch@lst.de>
CC: Tomas Henzl <thenzl@redhat.com>
CC: Dan Williams <dan.j.williams@intel.com>
CC: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Jason Yan 2018-09-25 10:56:52 +08:00 committed by Martin K. Petersen
parent 640208a1c9
commit 32c850bf58
1 changed files with 5 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/scsi/libsas/sas_expander.c
View File

@ -2054,14 +2054,11 @@ static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
return res;
}
/* delete the old link */
if (SAS_ADDR(phy->attached_sas_addr) &&
SAS_ADDR(sas_addr) != SAS_ADDR(phy->attached_sas_addr)) {
SAS_DPRINTK("ex %016llx phy 0x%x replace %016llx\n",
SAS_ADDR(dev->sas_addr), phy_id,
SAS_ADDR(phy->attached_sas_addr));
sas_unregister_devs_sas_addr(dev, phy_id, last);
}
/* we always have to delete the old device when we went here */
SAS_DPRINTK("ex %016llx phy 0x%x replace %016llx\n",
SAS_ADDR(dev->sas_addr), phy_id,
SAS_ADDR(phy->attached_sas_addr));
sas_unregister_devs_sas_addr(dev, phy_id, last);
return sas_discover_new(dev, phy_id);
}