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path: root/drivers/scsi/scsi_scan.c
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Diffstat (limited to 'drivers/scsi/scsi_scan.c')
-rw-r--r--drivers/scsi/scsi_scan.c32
1 files changed, 32 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
*