mptsas: zero based port identifier for each expander

diff -uarN b/drivers/message/fusion/mptbase.h a/drivers/message/fusion/mptbase.h
@@ -644,7 +644,6 @@
 	struct work_struct	 fc_rescan_work;
 	char			 fc_rescan_work_q_name[KOBJ_NAME_LEN];
 	struct workqueue_struct *fc_rescan_work_q;
-	u8		port_serial_number;
 } MPT_ADAPTER;
 
 /*

diff -uarN b/drivers/message/fusion/mptsas.c a/drivers/message/fusion/mptsas.c
@@ -144,7 +144,7 @@
  * Specific details on ports, wide/narrow
  */
 struct mptsas_portinfo_details{
-	u8	port_id; 	/* port number provided to transport */
+	u32	port_id; 	/* port number provided to transport */
 	u16	num_phys;	/* number of phys belong to this port */
 	u64	phy_bitmask; 	/* TODO, extend support for 255 phys */
 	struct sas_rphy *rphy;	/* transport layer rphy object */

@@ -171,6 +171,7 @@
 	struct list_head list;
 	u16		handle;		/* unique id to address this */
 	u16		num_phys;	/* number of phys */
+	u32		port_serial_number;
 	struct mptsas_phyinfo *phy_info;
 };
 

@@ -493,7 +494,7 @@
 				goto out;
 			port_details->num_phys = 1;
 			port_details->port_info = port_info;
-			port_details->port_id = ioc->port_serial_number++;
+			port_details->port_id = port_info->port_serial_number++;
 			if (phy_info->phy_id < 64 )
 				port_details->phy_bitmask |=
 				    (1 << phy_info->phy_id);

@@ -529,8 +530,7 @@
 					phy_info_cmp->port_details->port_id;
 				port_details->num_phys =
 					phy_info_cmp->port_details->num_phys;
-//				port_info->port_serial_number--;
-				ioc->port_serial_number--;
+				port_info->port_serial_number--;
 				if (!phy_info_cmp->port_details->num_phys)
 					kfree(phy_info_cmp->port_details);
 			} else