tipc: avoid unnecessary lookup for tipc bearer instance

tipc_block_bearer() currently takes a bearer name (const char*)
as argument. This requires the function to make a lookup to find
the pointer to the corresponding bearer struct. In the current
code base this is not necessary, since the only two callers
(tipc_continue(),recv_notification()) already have validated
copies of this pointer, and hence can pass it directly in the
function call.

We change tipc_block_bearer() to directly take struct tipc_bearer*
as argument instead.

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

4 files changed, 10 insertions, 18 deletions

diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 09faa5520079..3f9707a16d06 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -420,23 +420,15 @@ exit:
 }
 
 /**
- * tipc_block_bearer - Block the bearer with the given name, and reset all its links
+ * tipc_block_bearer - Block the bearer, and reset all its links
  */
-int tipc_block_bearer(const char *name)
+int tipc_block_bearer(struct tipc_bearer *b_ptr)
 {
-        struct tipc_bearer *b_ptr = NULL;
         struct tipc_link *l_ptr;
         struct tipc_link *temp_l_ptr;
 
         read_lock_bh(&tipc_net_lock);
-        b_ptr = tipc_bearer_find(name);
-        if (!b_ptr) {
-                pr_warn("Attempt to block unknown bearer <%s>\n", name);
-                read_unlock_bh(&tipc_net_lock);
-                return -EINVAL;
-        }
-
-        pr_info("Blocking bearer <%s>\n", name);
+        pr_info("Blocking bearer <%s>\n", b_ptr->name);
         spin_lock_bh(&b_ptr->lock);
         b_ptr->blocked = 1;
         list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
diff --git a/net/tipc/bearer.h b/net/tipc/bearer.h
index f800e63980cf..e5e04be6fffa 100644
--- a/net/tipc/bearer.h
+++ b/net/tipc/bearer.h
@@ -163,7 +163,7 @@ int tipc_register_media(struct tipc_media *m_ptr);
 
 void tipc_recv_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr);
 
-int  tipc_block_bearer(const char *name);
+int  tipc_block_bearer(struct tipc_bearer *b_ptr);
 void tipc_continue(struct tipc_bearer *tb_ptr);
 
 int tipc_enable_bearer(const char *bearer_name, u32 disc_domain, u32 priority);
diff --git a/net/tipc/eth_media.c b/net/tipc/eth_media.c
index e048d491cc0b..c36c938306a1 100644
--- a/net/tipc/eth_media.c
+++ b/net/tipc/eth_media.c
@@ -265,17 +265,17 @@ static int recv_notification(struct notifier_block *nb, unsigned long evt,
                 if (netif_carrier_ok(dev))
                         tipc_continue(eb_ptr->bearer);
                 else
-                        tipc_block_bearer(eb_ptr->bearer->name);
+                        tipc_block_bearer(eb_ptr->bearer);
                 break;
         case NETDEV_UP:
                 tipc_continue(eb_ptr->bearer);
                 break;
         case NETDEV_DOWN:
-                tipc_block_bearer(eb_ptr->bearer->name);
+                tipc_block_bearer(eb_ptr->bearer);
                 break;
         case NETDEV_CHANGEMTU:
         case NETDEV_CHANGEADDR:
-                tipc_block_bearer(eb_ptr->bearer->name);
+                tipc_block_bearer(eb_ptr->bearer);
                 tipc_continue(eb_ptr->bearer);
                 break;
         case NETDEV_UNREGISTER:
diff --git a/net/tipc/ib_media.c b/net/tipc/ib_media.c
index 5545145ccffa..20b1aa464321 100644
--- a/net/tipc/ib_media.c
+++ b/net/tipc/ib_media.c
@@ -258,17 +258,17 @@ static int recv_notification(struct notifier_block *nb, unsigned long evt,
                 if (netif_carrier_ok(dev))
                         tipc_continue(ib_ptr->bearer);
                 else
-                        tipc_block_bearer(ib_ptr->bearer->name);
+                        tipc_block_bearer(ib_ptr->bearer);
                 break;
         case NETDEV_UP:
                 tipc_continue(ib_ptr->bearer);
                 break;
         case NETDEV_DOWN:
-                tipc_block_bearer(ib_ptr->bearer->name);
+                tipc_block_bearer(ib_ptr->bearer);
                 break;
         case NETDEV_CHANGEMTU:
         case NETDEV_CHANGEADDR:
-                tipc_block_bearer(ib_ptr->bearer->name);
+                tipc_block_bearer(ib_ptr->bearer);
                 tipc_continue(ib_ptr->bearer);
                 break;
         case NETDEV_UNREGISTER: