tipc: make broadcast bearer store in bearer_list array

Now unicast bearer is dynamically allocated and placed into its
identity specified slot of bearer_list array. When we search
bearer_list array with a bearer identity, the corresponding bearer
instance can be found. But broadcast bearer is statically allocated
and it is not located in the bearer_list array yet. So we decide to
enlarge bearer_list array into MAX_BEARERS + 1 slots, and its last
slot stores the broadcast bearer so that the broadcast bearer can
be found from bearer_list array with MAX_BEARERS as index. The
change will help us reduce the complex relationship between bearer
and link in the future.

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>

2 files changed, 6 insertions, 4 deletions

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index 47bb07aac16c..95ab5ef92920 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -41,9 +41,9 @@
 #include "bcast.h"
 #include "name_distr.h"
 
-#define MAX_PKT_DEFAULT_MCAST 1500      /* bcast link max packet size (fixed) */
-
-#define BCLINK_WIN_DEFAULT 20           /* bcast link window size (default) */
+#define MAX_PKT_DEFAULT_MCAST   1500    /* bcast link max packet size (fixed) */
+#define BCLINK_WIN_DEFAULT      20      /* bcast link window size (default) */
+#define BCBEARER                MAX_BEARERS
 
 /**
  * struct tipc_bcbearer_pair - a pair of bearers used by broadcast link
@@ -784,6 +784,7 @@ void tipc_bclink_init(void)
         bcl->max_pkt = MAX_PKT_DEFAULT_MCAST;
         tipc_link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT);
         bcl->b_ptr = &bcbearer->bearer;
+        bearer_list[BCBEARER] = &bcbearer->bearer;
         bcl->state = WORKING_WORKING;
         strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME);
 }
@@ -794,6 +795,7 @@ void tipc_bclink_stop(void)
         tipc_link_purge_queues(bcl);
         spin_unlock_bh(&bc_lock);
 
+        bearer_list[BCBEARER] = NULL;
         memset(bclink, 0, sizeof(*bclink));
         memset(bcbearer, 0, sizeof(*bcbearer));
 }
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 826b7010ab69..ed45f9717af1 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -49,7 +49,7 @@ static struct tipc_media * const media_info_array[] = {
         NULL
 };
 
-struct tipc_bearer *bearer_list[MAX_BEARERS];
+struct tipc_bearer *bearer_list[MAX_BEARERS + 1];
 
 static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down);