[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>

drivers/scsi/qla4xxx/ql4_fw.h

@@ -673,17 +673,17 @@ struct flash_sys_info {
 };	/* 200 */
 
 struct mbx_sys_info {
-	uint8_t board_id_str[16];	/* Keep board ID string first */
+	uint8_t board_id_str[16];   /*  0-f  Keep board ID string first */
 				/* in this structure for GUI. */
-	uint16_t board_id;	/* board ID code */
-	uint16_t phys_port_cnt;	/* number of physical network ports */
-	uint16_t port_num;	/* network port for this PCI function */
+	uint16_t board_id;	/* 10-11 board ID code */
+	uint16_t phys_port_cnt;	/* 12-13 number of physical network ports */
+	uint16_t port_num;	/* 14-15 network port for this PCI function */
 				/* (port 0 is first port) */
-	uint8_t mac_addr[6];	/* MAC address for this PCI function */
-	uint32_t iscsi_pci_func_cnt;	/* number of iSCSI PCI functions */
-	uint32_t pci_func;		/* this PCI function */
-	unsigned char serial_number[16];	/* serial number string */
-	uint8_t reserved[16];
+	uint8_t mac_addr[6];	/* 16-1b MAC address for this PCI function */
+	uint32_t iscsi_pci_func_cnt;  /* 1c-1f number of iSCSI PCI functions */
+	uint32_t pci_func;	      /* 20-23 this PCI function */
+	unsigned char serial_number[16];  /* 24-33 serial number string */
+	uint8_t reserved[12];		  /* 34-3f */
 };
 
 struct crash_record {

drivers/scsi/qla4xxx/ql4_nx.c

@@ -2145,7 +2145,8 @@ int qla4_8xxx_get_sys_info(struct scsi_qla_host *ha)
 		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;