This patch is from 
http://patchwork.kernel.org/patch/38102/
It seems its still under discussion and it will involve glibc to get it fixed correctly.
for now OE uses scsi headers from kernel and not from glibc.

-Khem

Index: linux-2.6.31/include/scsi/scsi.h
===================================================================
--- linux-2.6.31.orig/include/scsi/scsi.h	2010-03-11 19:44:49.134590561 -0800
+++ linux-2.6.31/include/scsi/scsi.h	2010-03-11 19:45:12.744466326 -0800
@@ -142,10 +142,10 @@ struct scsi_cmnd;
 
 /* defined in T10 SCSI Primary Commands-2 (SPC2) */
 struct scsi_varlen_cdb_hdr {
-	u8 opcode;        /* opcode always == VARIABLE_LENGTH_CMD */
-	u8 control;
-	u8 misc[5];
-	u8 additional_cdb_length;         /* total cdb length - 8 */
+	__u8 opcode;        /* opcode always == VARIABLE_LENGTH_CMD */
+	__u8 control;
+	__u8 misc[5];
+	__u8 additional_cdb_length;         /* total cdb length - 8 */
 	__be16 service_action;
 	/* service specific data follows */
 };