tipc: remove user_port instance from tipc_port structure

After the native API has been completely removed, the 'user_port'
field in struct tipc_port becomes unused, and can be removed.
As a consequence, the "usrmem" argument in tipc_msg_build() is no
longer needed, and so we remove that one too.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/link.c

@@ -1081,7 +1081,7 @@ again:
 	 * (Must not hold any locks while building message.)
 	 */
 	res = tipc_msg_build(hdr, msg_sect, num_sect, total_len,
-			     sender->max_pkt, !sender->user_port, &buf);
+			     sender->max_pkt, &buf);
 
 	read_lock_bh(&tipc_net_lock);
 	node = tipc_node_find(destaddr);
@@ -1216,18 +1216,14 @@ again:
 		else
 			sz = fragm_rest;
 
-		if (likely(!sender->user_port)) {
-			if (copy_from_user(buf->data + fragm_crs, sect_crs, sz)) {
+		if (copy_from_user(buf->data + fragm_crs, sect_crs, sz)) {
 error:
-				for (; buf_chain; buf_chain = buf) {
-					buf = buf_chain->next;
-					kfree_skb(buf_chain);
-				}
-				return -EFAULT;
+			for (; buf_chain; buf_chain = buf) {
+				buf = buf_chain->next;
+				kfree_skb(buf_chain);
 			}
-		} else
-			skb_copy_to_linear_data_offset(buf, fragm_crs,
-						       sect_crs, sz);
+			return -EFAULT;
+		}
 		sect_crs += sz;
 		sect_rest -= sz;
 		fragm_crs += sz;

net/tipc/msg.c

@@ -73,8 +73,8 @@ void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
  * Returns message data size or errno
  */
 int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect,
-		   u32 num_sect, unsigned int total_len,
-			    int max_size, int usrmem, struct sk_buff **buf)
+		   u32 num_sect, unsigned int total_len, int max_size,
+		   struct sk_buff **buf)
 {
 	int dsz, sz, hsz, pos, res, cnt;
 
@@ -92,14 +92,9 @@ int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect,
 		return -ENOMEM;
 	skb_copy_to_linear_data(*buf, hdr, hsz);
 	for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
-		if (likely(usrmem))
-			res = !copy_from_user((*buf)->data + pos,
-					      msg_sect[cnt].iov_base,
-					      msg_sect[cnt].iov_len);
-		else
-			skb_copy_to_linear_data_offset(*buf, pos,
-						       msg_sect[cnt].iov_base,
-						       msg_sect[cnt].iov_len);
+		skb_copy_to_linear_data_offset(*buf, pos,
+					       msg_sect[cnt].iov_base,
+					       msg_sect[cnt].iov_len);
 		pos += msg_sect[cnt].iov_len;
 	}
 	if (likely(res))

net/tipc/msg.h

@@ -722,6 +722,6 @@ u32 tipc_msg_tot_importance(struct tipc_msg *m);
 void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
 			    u32 hsize, u32 destnode);
 int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect,
-		   u32 num_sect, unsigned int total_len,
-			    int max_size, int usrmem, struct sk_buff **buf);
+		   u32 num_sect, unsigned int total_len, int max_size,
+		   struct sk_buff **buf);
 #endif

net/tipc/port.c

@@ -115,7 +115,7 @@ int tipc_multicast(u32 ref, struct tipc_name_seq const *seq,
 	msg_set_nameupper(hdr, seq->upper);
 	msg_set_hdr_sz(hdr, MCAST_H_SIZE);
 	res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
-			!oport->user_port, &buf);
+			     &buf);
 	if (unlikely(!buf))
 		return res;
 
@@ -234,7 +234,6 @@ struct tipc_port *tipc_createport_raw(void *usr_handle,
 	INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
 	p_ptr->dispatcher = dispatcher;
 	p_ptr->wakeup = wakeup;
-	p_ptr->user_port = NULL;
 	k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
 	INIT_LIST_HEAD(&p_ptr->publications);
 	INIT_LIST_HEAD(&p_ptr->port_list);
@@ -271,7 +270,6 @@ int tipc_deleteport(u32 ref)
 		buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
 		tipc_nodesub_unsubscribe(&p_ptr->subscription);
 	}
-	kfree(p_ptr->user_port);
 
 	spin_lock_bh(&tipc_port_list_lock);
 	list_del(&p_ptr->port_list);
@@ -444,7 +442,7 @@ int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
 	int res;
 
 	res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
-			!p_ptr->user_port, &buf);
+			     &buf);
 	if (!buf)
 		return res;
 
@@ -927,7 +925,7 @@ static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_se
 	int res;
 
 	res = tipc_msg_build(&sender->phdr, msg_sect, num_sect, total_len,
-			MAX_MSG_SIZE, !sender->user_port, &buf);
+			     MAX_MSG_SIZE, &buf);
 	if (likely(buf))
 		tipc_port_recv_msg(buf);
 	return res;

net/tipc/port.h

@@ -46,18 +46,6 @@
 #define CONN_OVERLOAD_LIMIT	((TIPC_FLOW_CONTROL_WIN * 2 + 1) * \
 				SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE))
 
-/**
- * struct user_port - TIPC user port (used with native API)
- * @usr_handle: user-specified field
- * @ref: object reference to associated TIPC port
- *
- * <various callback routines>
- */
-struct user_port {
-	void *usr_handle;
-	u32 ref;
-};
-
 /**
  * struct tipc_port - TIPC port structure
  * @usr_handle: pointer to additional user-defined information about port
@@ -74,7 +62,6 @@ struct user_port {
  * @port_list: adjacent ports in TIPC's global list of ports
  * @dispatcher: ptr to routine which handles received messages
  * @wakeup: ptr to routine to call when port is no longer congested
- * @user_port: ptr to user port associated with port (if any)
  * @wait_list: adjacent ports in list of ports waiting on link congestion
  * @waiting_pkts:
  * @sent: # of non-empty messages sent by port
@@ -101,7 +88,6 @@ struct tipc_port {
 	struct list_head port_list;
 	u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
 	void (*wakeup)(struct tipc_port *);
-	struct user_port *user_port;
 	struct list_head wait_list;
 	u32 waiting_pkts;
 	u32 sent;