[SCSI] qla4xxx: updated mbx_sys_info struct to sync with FW 4.6.x


Also, changed boundary checking from size of total
structure to verification that we received the amount of
data needed to cache inernally. This change will provide
compatibility with mbx_sys_info structure sizes in both
older and newer firmware versions.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Ravi Anand <ravi.anand@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/qla4xxx/ql4_nx.c b/drivers/scsi/qla4xxx/ql4_nx.c
index 3e119ae..ec46651 100644
--- a/drivers/scsi/qla4xxx/ql4_nx.c
+++ b/drivers/scsi/qla4xxx/ql4_nx.c
@@ -2145,7 +2145,8 @@
 		goto exit_validate_mac82;
 	}
 
-	if (mbox_sts[4] < sizeof(*sys_info)) {
+	/* Make sure we receive the minimum required data to cache internally */
+	if (mbox_sts[4] < offsetof(struct mbx_sys_info, reserved)) {
 		DEBUG2(printk("scsi%ld: %s: GET_SYS_INFO data receive"
 		    " error (%x)\n", ha->host_no, __func__, mbox_sts[4]));
 		goto exit_validate_mac82;