1 files changed, 49 insertions, 2 deletions

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 9fa209097e3b..48edd67982a5 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -336,9 +336,23 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
         unsigned long flags;
         const int size = sizeof(struct scsi_target)
                 + shost->transportt->target_size;
-        struct scsi_target *starget = kmalloc(size, GFP_ATOMIC);
+        struct scsi_target *starget;
         struct scsi_target *found_target;
 
+        /*
+         * Obtain the real parent from the transport. The transport
+         * is allowed to fail (no error) if there is nothing at that
+         * target id.
+         */
+        if (shost->transportt->target_parent) {
+                spin_lock_irqsave(shost->host_lock, flags);
+                parent = shost->transportt->target_parent(shost, channel, id);
+                spin_unlock_irqrestore(shost->host_lock, flags);
+                if (!parent)
+                        return NULL;
+        }
+
+        starget = kmalloc(size, GFP_KERNEL);
         if (!starget) {
                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
                 return NULL;
@@ -756,7 +770,8 @@ static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
          * register it and tell the rest of the kernel
          * about it.
          */
-        scsi_sysfs_add_sdev(sdev);
+        if (scsi_sysfs_add_sdev(sdev) != 0)
+                return SCSI_SCAN_NO_RESPONSE;
 
         return SCSI_SCAN_LUN_PRESENT;
 }
@@ -1000,6 +1015,38 @@ static int scsilun_to_int(struct scsi_lun *scsilun)
 }
 
 /**
+ * int_to_scsilun: reverts an int into a scsi_lun
+ * @int:        integer to be reverted
+ * @scsilun:    struct scsi_lun to be set.
+ *
+ * Description:
+ *     Reverts the functionality of the scsilun_to_int, which packed
+ *     an 8-byte lun value into an int. This routine unpacks the int
+ *     back into the lun value.
+ *     Note: the scsilun_to_int() routine does not truly handle all
+ *     8bytes of the lun value. This functions restores only as much
+ *     as was set by the routine.
+ *
+ * Notes:
+ *     Given an integer : 0x0b030a04,  this function returns a
+ *     scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
+ *
+ **/
+void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
+{
+        int i;
+
+        memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
+
+        for (i = 0; i < sizeof(lun); i += 2) {
+                scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
+                scsilun->scsi_lun[i+1] = lun & 0xFF;
+                lun = lun >> 16;
+        }
+}
+EXPORT_SYMBOL(int_to_scsilun);
+
+/**
  * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
  * @sdevscan:   scan the host, channel, and id of this Scsi_Device
  *