From 45341ca3fcacc8720c425e757a627ef81b65b1ee Mon Sep 17 00:00:00 2001
From: Subhash Jadavani <subhashj@codeaurora.org>
Date: Thu, 25 Sep 2014 15:32:19 +0300
Subject: [PATCH] scsi: fix the type for well known LUs
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>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/scsi/scsi_scan.c | 13 +++++++++++++
include/scsi/scsi.h | 1 +
2 files changed, 14 insertions(+)
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index f84c401884781..dde0c542e0b1b 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -815,6 +815,19 @@ 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%16xhN\n",
+ __func__, sdev->type, (unsigned int)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 261e708010da7..d17178e6fcdd7 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 */