tipc: convert allocations of global variables associated with bclink

Convert allocations of global variables associated with bclink from
static way to dynamical way for the convenience of bclink instance
initialisation. Meanwhile, this also helps TIPC support name space
in the future easily.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 32 insertions, 15 deletions

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index 9eceaa72f21b..ef8cff4ad743 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -100,12 +100,9 @@ struct tipc_bclink {
         struct tipc_node *retransmit_to;
 };
 
-static struct tipc_bcbearer bcast_bearer;
-static struct tipc_bclink bcast_link;
-
-static struct tipc_bcbearer *bcbearer = &bcast_bearer;
-static struct tipc_bclink *bclink = &bcast_link;
-static struct tipc_link *bcl = &bcast_link.link;
+static struct tipc_bcbearer *bcbearer;
+static struct tipc_bclink *bclink;
+static struct tipc_link *bcl;
 
 const char tipc_bclink_name[] = "broadcast-link";
 
@@ -788,8 +785,19 @@ int tipc_bclink_set_queue_limits(u32 limit)
         return 0;
 }
 
-void tipc_bclink_init(void)
+int tipc_bclink_init(void)
 {
+        bcbearer = kzalloc(sizeof(*bcbearer), GFP_ATOMIC);
+        if (!bcbearer)
+                return -ENOMEM;
+
+        bclink = kzalloc(sizeof(*bclink), GFP_ATOMIC);
+        if (!bclink) {
+                kfree(bcbearer);
+                return -ENOMEM;
+        }
+
+        bcl = &bclink->link;
         bcbearer->bearer.media = &bcbearer->media;
         bcbearer->media.send_msg = tipc_bcbearer_send;
         sprintf(bcbearer->media.name, "tipc-broadcast");
@@ -805,6 +813,7 @@ void tipc_bclink_init(void)
         rcu_assign_pointer(bearer_list[MAX_BEARERS], &bcbearer->bearer);
         bcl->state = WORKING_WORKING;
         strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME);
+        return 0;
 }
 
 void tipc_bclink_stop(void)
@@ -814,8 +823,9 @@ void tipc_bclink_stop(void)
         tipc_bclink_unlock();
 
         RCU_INIT_POINTER(bearer_list[BCBEARER], NULL);
-        memset(bclink, 0, sizeof(*bclink));
-        memset(bcbearer, 0, sizeof(*bcbearer));
+        synchronize_net();
+        kfree(bcbearer);
+        kfree(bclink);
 }
 
 /**
diff --git a/net/tipc/bcast.h b/net/tipc/bcast.h
index 7c1ef1b3d7b3..ea162c7b30ee 100644
--- a/net/tipc/bcast.h
+++ b/net/tipc/bcast.h
@@ -81,7 +81,7 @@ static inline int tipc_nmap_equal(struct tipc_node_map *nm_a,
 void tipc_port_list_add(struct tipc_port_list *pl_ptr, u32 port);
 void tipc_port_list_free(struct tipc_port_list *pl_ptr);
 
-void tipc_bclink_init(void);
+int tipc_bclink_init(void);
 void tipc_bclink_stop(void);
 void tipc_bclink_add_node(u32 addr);
 void tipc_bclink_remove_node(u32 addr);
diff --git a/net/tipc/config.c b/net/tipc/config.c
index 251f5a2028e4..2b42403ad33a 100644
--- a/net/tipc/config.c
+++ b/net/tipc/config.c
@@ -177,8 +177,10 @@ static struct sk_buff *cfg_set_own_addr(void)
         if (tipc_own_addr)
                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
                                                    " (cannot change node address once assigned)");
-        tipc_net_start(addr);
-        return tipc_cfg_reply_none();
+        if (!tipc_net_start(addr))
+                return tipc_cfg_reply_none();
+
+        return tipc_cfg_reply_error_string("cannot change to network mode");
 }
 
 static struct sk_buff *cfg_set_max_ports(void)
diff --git a/net/tipc/net.c b/net/tipc/net.c
index 75bb39025d53..f8fc95d58c0d 100644
--- a/net/tipc/net.c
+++ b/net/tipc/net.c
@@ -164,20 +164,25 @@ void tipc_net_route_msg(struct sk_buff *buf)
         tipc_link_xmit(buf, dnode, msg_link_selector(msg));
 }
 
-void tipc_net_start(u32 addr)
+int tipc_net_start(u32 addr)
 {
         char addr_string[16];
+        int res;
 
         tipc_own_addr = addr;
         tipc_named_reinit();
         tipc_port_reinit();
-        tipc_bclink_init();
+        res = tipc_bclink_init();
+        if (res)
+                return res;
+
         tipc_nametbl_publish(TIPC_CFG_SRV, tipc_own_addr, tipc_own_addr,
                              TIPC_ZONE_SCOPE, 0, tipc_own_addr);
 
         pr_info("Started in network mode\n");
         pr_info("Own node address %s, network identity %u\n",
                 tipc_addr_string_fill(addr_string, tipc_own_addr), tipc_net_id);
+        return 0;
 }
 
 void tipc_net_stop(void)
diff --git a/net/tipc/net.h b/net/tipc/net.h
index f781cae8df4b..c6c2b46f7c28 100644
--- a/net/tipc/net.h
+++ b/net/tipc/net.h
@@ -39,7 +39,7 @@
 
 void tipc_net_route_msg(struct sk_buff *buf);
 
-void tipc_net_start(u32 addr);
+int tipc_net_start(u32 addr);
 void tipc_net_stop(void);
 
 #endif