diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
index e69477d..f01ec0a 100644
--- a/drivers/scsi/scsi_devinfo.c
+++ b/drivers/scsi/scsi_devinfo.c
@@ -354,8 +354,9 @@
  *     @model, if found, return the matching flags value, else return
  *     the host or global default settings.
  **/
-int scsi_get_device_flags(struct scsi_device *sdev, unsigned char *vendor,
-			  unsigned char *model)
+int scsi_get_device_flags(struct scsi_device *sdev,
+			  const unsigned char *vendor,
+			  const unsigned char *model)
 {
 	struct scsi_dev_info_list *devinfo;
 	unsigned int bflags;
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index d632d9e..a8d121c 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -57,7 +57,8 @@
 
 /* scsi_devinfo.c */
 extern int scsi_get_device_flags(struct scsi_device *sdev,
-				 unsigned char *vendor, unsigned char *model);
+				 const unsigned char *vendor,
+				 const unsigned char *model);
 extern int __init scsi_init_devinfo(void);
 extern void scsi_exit_devinfo(void);
 
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 85cfd88..063e32f 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -79,9 +79,9 @@
 	char inq_periph_qual;	/* PQ from INQUIRY data */	
 	unsigned char inquiry_len;	/* valid bytes in 'inquiry' */
 	unsigned char * inquiry;	/* INQUIRY response data */
-	char * vendor;		/* [back_compat] point into 'inquiry' ... */
-	char * model;		/* ... after scan; point to static string */
-	char * rev;		/* ... "nullnullnullnull" before scan */
+	const char * vendor;		/* [back_compat] point into 'inquiry' ... */
+	const char * model;		/* ... after scan; point to static string */
+	const char * rev;		/* ... "nullnullnullnull" before scan */
 	unsigned char current_tag;	/* current tag */
 	struct scsi_target      *sdev_target;   /* used only for single_lun */