tipc: Simplify bearer shutdown logic

Optimize processing in TIPC's bearer shutdown code, including:

1. Remove an unnecessary check to see if TIPC bearer's can exist.
2. Don't release spinlocks before calling a media-specific disabling
routine, since the routine can't sleep.
3. Make bearer_disable() operate directly on a struct bearer, instead
of needlessly taking a name and then mapping that to the struct.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Reviewed-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 27 deletions

diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 9c10c6b7c12b..fd9c06c68281 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -288,9 +288,6 @@ static struct bearer *bearer_find(const char *name)
         struct bearer *b_ptr;
         u32 i;
 
-        if (tipc_mode != TIPC_NET_MODE)
-                return NULL;
-
         for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
                 if (b_ptr->active && (!strcmp(b_ptr->publ.name, name)))
                         return b_ptr;
@@ -630,30 +627,17 @@ int tipc_block_bearer(const char *name)
  * Note: This routine assumes caller holds tipc_net_lock.
  */
 
-static int bearer_disable(const char *name)
+static int bearer_disable(struct bearer *b_ptr)
 {
-        struct bearer *b_ptr;
         struct link *l_ptr;
         struct link *temp_l_ptr;
 
-        b_ptr = bearer_find(name);
-        if (!b_ptr) {
-                warn("Attempt to disable unknown bearer <%s>\n", name);
-                return -EINVAL;
-        }
-
-        info("Disabling bearer <%s>\n", name);
+        info("Disabling bearer <%s>\n", b_ptr->publ.name);
         tipc_disc_stop_link_req(b_ptr->link_req);
         spin_lock_bh(&b_ptr->publ.lock);
         b_ptr->link_req = NULL;
         b_ptr->publ.blocked = 1;
-        if (b_ptr->media->disable_bearer) {
-                spin_unlock_bh(&b_ptr->publ.lock);
-                write_unlock_bh(&tipc_net_lock);
-                b_ptr->media->disable_bearer(&b_ptr->publ);
-                write_lock_bh(&tipc_net_lock);
-                spin_lock_bh(&b_ptr->publ.lock);
-        }
+        b_ptr->media->disable_bearer(&b_ptr->publ);
         list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
                 tipc_link_delete(l_ptr);
         }
@@ -664,10 +648,16 @@ static int bearer_disable(const char *name)
 
 int tipc_disable_bearer(const char *name)
 {
+        struct bearer *b_ptr;
         int res;
 
         write_lock_bh(&tipc_net_lock);
-        res = bearer_disable(name);
+        b_ptr = bearer_find(name);
+        if (b_ptr == NULL) {
+                warn("Attempt to disable unknown bearer <%s>\n", name);
+                res = -EINVAL;
+        } else
+                res = bearer_disable(b_ptr);
         write_unlock_bh(&tipc_net_lock);
         return res;
 }
@@ -680,13 +670,7 @@ void tipc_bearer_stop(void)
 
         for (i = 0; i < MAX_BEARERS; i++) {
                 if (tipc_bearers[i].active)
-                        tipc_bearers[i].publ.blocked = 1;
-        }
-        for (i = 0; i < MAX_BEARERS; i++) {
-                if (tipc_bearers[i].active)
-                        bearer_disable(tipc_bearers[i].publ.name);
+                        bearer_disable(&tipc_bearers[i]);
         }
         media_count = 0;
 }
-
-