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-rw-r--r--drivers/scsi/scsi_scan.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 803c7b9690c5..94b86d5b1469 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -853,6 +853,19 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
853 goto out_free_result; 853 goto out_free_result;
854 } 854 }
855 855
856 /*
857 * Non-standard SCSI targets may set the PDT to 0x1f (unknown or
858 * no device type) instead of using the Peripheral Qualifier to
859 * indicate that no LUN is present. For example, USB UFI does this.
860 */
861 if (starget->pdt_1f_for_no_lun && (result[0] & 0x1f) == 0x1f) {
862 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
863 "scsi scan: peripheral device type"
864 " of 31, no device added\n"));
865 res = SCSI_SCAN_TARGET_PRESENT;
866 goto out_free_result;
867 }
868
856 res = scsi_add_lun(sdev, result, &bflags); 869 res = scsi_add_lun(sdev, result, &bflags);
857 if (res == SCSI_SCAN_LUN_PRESENT) { 870 if (res == SCSI_SCAN_LUN_PRESENT) {
858 if (bflags & BLIST_KEY) { 871 if (bflags & BLIST_KEY) {