2 files changed, 33 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 9fa209097e3b..ad3a5b142468 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -1000,6 +1000,38 @@ 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
  *
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 63c91dd85ca1..223f92f4d2cb 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -243,6 +243,7 @@ extern void scsi_target_reap(struct scsi_target *);
 extern void scsi_target_block(struct device *);
 extern void scsi_target_unblock(struct device *);
 extern void scsi_remove_target(struct device *);
+extern void int_to_scsilun(unsigned int, struct scsi_lun *);
 extern const char *scsi_device_state_name(enum scsi_device_state);
 extern int scsi_is_sdev_device(const struct device *);
 extern int scsi_is_target_device(const struct device *);