[PATCH V6 01/18] scsi: fixing the "type" for well known LUs

[Dolev Raviv <draviv@codeaurora.org>]

From: Subhash Jadavani <subhashj@codeaurora.org>

Some devices may respond with wrong type for well-known logical units.
This patch forces well-known type for devices which doesn't report it
correct.

Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Dolev Raviv <draviv@codeaurora.org>

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 56675db..1095d5a 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -805,6 +805,19 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
 	} else {
 		sdev->type = (inq_result[0] & 0x1f);
 		sdev->removable = (inq_result[1] & 0x80) >> 7;
+
+		/*
+		 * some devices may respond with wrong type for
+		 * well-known logical units. Force well-known type
+		 * to enumerate them correctly.
+		 */
+		if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) {
+			sdev_printk(KERN_WARNING, sdev,
+				"%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16phN\n",
+				__func__, sdev->type, sdev->lun);
+			sdev->type = TYPE_WLUN;
+		}
+
 	}
 
 	if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 261e708..d17178e 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -333,6 +333,7 @@ static inline int scsi_status_is_good(int status)
 #define TYPE_RBC	    0x0e
 #define TYPE_OSD            0x11
 #define TYPE_ZBC            0x14
+#define TYPE_WLUN           0x1e    /* well-known logical unit */
 #define TYPE_NO_LUN         0x7f
 
 /* SCSI protocols; these are taken from SPC-3 section 7.5 */
-- 
1.8.5.2
-- 
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation