tipc: remove bearer_lock from tipc_bearer struct

After the earlier commits ("tipc: remove 'links' list from
tipc_bearer struct") and ("tipc: introduce new spinlock to protect
struct link_req"), there is no longer any need to protect struct
link_req or or any link list by use of bearer_lock. Furthermore,
we have eliminated the need for using bearer_lock during downcalls
(send) from the link to the bearer, since we have ensured that
bearers always have a longer life cycle that their associated links,
and always contain valid data.

So, the only need now for a lock protecting bearers is for guaranteeing
consistency of the bearer list itself. For this, it is sufficient, at
least for the time being, to continue applying 'net_lock´ in write mode.

By removing bearer_lock we also pre-empt introduction of issue b) descibed
in the previous commit "tipc: remove 'links' list from tipc_bearer struct":

"b) When the outer protection from net_lock is gone, taking
    bearer_lock and node_lock in opposite order of method 1) and 2)
    will become an obvious deadlock hazard".

Therefore, we now eliminate the bearer_lock spinlock.

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>

3 files changed, 4 insertions, 18 deletions

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index af35f76c6b29..06a639c375f0 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -785,7 +785,6 @@ void tipc_bclink_init(void)
         bcl->owner = &bclink->node;
         bcl->max_pkt = MAX_PKT_DEFAULT_MCAST;
         tipc_link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT);
-        spin_lock_init(&bcbearer->bearer.lock);
         bcl->b_ptr = &bcbearer->bearer;
         bcl->state = WORKING_WORKING;
         strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME);
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 60caa45e5a41..242cddd35a47 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -327,7 +327,6 @@ restart:
         b_ptr->net_plane = bearer_id + 'A';
         b_ptr->active = 1;
         b_ptr->priority = priority;
-        spin_lock_init(&b_ptr->lock);
 
         res = tipc_disc_create(b_ptr, &b_ptr->bcast_addr, disc_domain);
         if (res) {
@@ -351,9 +350,7 @@ static int tipc_reset_bearer(struct tipc_bearer *b_ptr)
 {
         read_lock_bh(&tipc_net_lock);
         pr_info("Resetting bearer <%s>\n", b_ptr->name);
-        spin_lock_bh(&b_ptr->lock);
         tipc_link_reset_list(b_ptr->identity);
-        spin_unlock_bh(&b_ptr->lock);
         read_unlock_bh(&tipc_net_lock);
         return 0;
 }
@@ -365,19 +362,12 @@ static int tipc_reset_bearer(struct tipc_bearer *b_ptr)
  */
 static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down)
 {
-        struct tipc_link_req *temp_req;
-
         pr_info("Disabling bearer <%s>\n", b_ptr->name);
-        spin_lock_bh(&b_ptr->lock);
         b_ptr->media->disable_media(b_ptr);
-        tipc_link_delete_list(b_ptr->identity, shutting_down);
-        temp_req = b_ptr->link_req;
-        b_ptr->link_req = NULL;
-        spin_unlock_bh(&b_ptr->lock);
-
-        if (temp_req)
-                tipc_disc_delete(temp_req);
 
+        tipc_link_delete_list(b_ptr->identity, shutting_down);
+        if (b_ptr->link_req)
+                tipc_disc_delete(b_ptr->link_req);
         memset(b_ptr, 0, sizeof(struct tipc_bearer));
 }
 
diff --git a/net/tipc/bearer.h b/net/tipc/bearer.h
index 647cb1d2324a..425dd8107a8f 100644
--- a/net/tipc/bearer.h
+++ b/net/tipc/bearer.h
@@ -107,10 +107,8 @@ struct tipc_media {
 
 /**
  * struct tipc_bearer - Generic TIPC bearer structure
- * @dev: ptr to associated network device
- * @usr_handle: pointer to additional media-specific information about bearer
+ * @media_ptr: pointer to additional media-specific information about bearer
  * @mtu: max packet size bearer can support
- * @lock: spinlock for controlling access to bearer
  * @addr: media-specific address associated with bearer
  * @name: bearer name (format = media:interface)
  * @media: ptr to media structure associated with bearer
@@ -133,7 +131,6 @@ struct tipc_bearer {
         u32 mtu;                                /* initalized by media */
         struct tipc_media_addr addr;            /* initalized by media */
         char name[TIPC_MAX_BEARER_NAME];
-        spinlock_t lock;
         struct tipc_media *media;
         struct tipc_media_addr bcast_addr;
         u32 priority;