[SCSI] Disable DIF on Hitachi Ultrastar 15K300

Hitachi Ultrastar 15K300 is quirky. Disable T10 PI (DIF).

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 5 insertions, 0 deletions

diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 9895f69294fc..88fae8d20154 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -156,6 +156,7 @@ struct scsi_device {
         unsigned is_visible:1;  /* is the device visible in sysfs */
         unsigned can_power_off:1; /* Device supports runtime power off */
         unsigned wce_default_on:1;      /* Cache is ON by default */
+        unsigned no_dif:1;      /* T10 PI (DIF) should be disabled */
 
         DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
         struct list_head event_list;    /* asserted events */
@@ -476,6 +477,9 @@ static inline int scsi_device_enclosure(struct scsi_device *sdev)
 
 static inline int scsi_device_protection(struct scsi_device *sdev)
 {
+        if (sdev->no_dif)
+                return 0;
+
         return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
 }
 
diff --git a/include/scsi/scsi_devinfo.h b/include/scsi/scsi_devinfo.h
index b4ddd3b18b4c..cc1f3e786ad7 100644
--- a/include/scsi/scsi_devinfo.h
+++ b/include/scsi/scsi_devinfo.h
@@ -30,4 +30,5 @@
 #define BLIST_RETRY_HWERROR     0x400000 /* retry HARDWARE_ERROR */
 #define BLIST_MAX_512           0x800000 /* maximum 512 sector cdb length */
 #define BLIST_ATTACH_PQ3        0x1000000 /* Scan: Attach to PQ3 devices */
+#define BLIST_NO_DIF            0x2000000 /* Disable T10 PI (DIF) */
 #endif