[SCSI] ipr: slave_alloc optimization

Optimize ipr's slave_alloc to return -ENXIO for devices that
do not exist.

Signed-off-by: Brian King <brking@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 63d01e6394a2..8817ea06adbf 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -2815,13 +2815,14 @@ static int ipr_slave_configure(struct scsi_device *sdev)
  * handling new commands.
  *
  * Return value:
- *      0 on success
+ *      0 on success / -ENXIO if device does not exist
  **/
 static int ipr_slave_alloc(struct scsi_device *sdev)
 {
         struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *) sdev->host->hostdata;
         struct ipr_resource_entry *res;
         unsigned long lock_flags;
+        int rc = -ENXIO;
 
         sdev->hostdata = NULL;
 
@@ -2836,13 +2837,14 @@ static int ipr_slave_alloc(struct scsi_device *sdev)
                         res->in_erp = 0;
                         sdev->hostdata = res;
                         res->needs_sync_complete = 1;
+                        rc = 0;
                         break;
                 }
         }
 
         spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
 
-        return 0;
+        return rc;
 }
 
 /**