From e9926b4376544d5a2dc4d310d4d0006c634b1a93 Mon Sep 17 00:00:00 2001
From: Akinobu Mita <akinobu.mita@gmail.com>
Date: Sat, 29 Jun 2013 17:59:17 +0900
Subject: [SCSI] scsi_debug: invalidate protection info for unmapped region

When UNMAP command is issued with the data integrity support enabled,
the protection info for the unmapped region is remain unchanged.
So READ command for the region later on causes data integrity failure.

This fixes it by invalidating protection info for the unmapped region
by filling with 0xff pattern.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Acked-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index e83e661..83efec2 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -2064,6 +2064,11 @@ static void unmap_region(sector_t lba, unsigned int len)
 				       scsi_debug_sector_size *
 				       scsi_debug_unmap_granularity);
 			}
+			if (dif_storep) {
+				memset(dif_storep + lba, 0xff,
+				       sizeof(*dif_storep) *
+				       scsi_debug_unmap_granularity);
+			}
 		}
 		lba = map_index_to_lba(index + 1);
 	}
-- 
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