tipc: introduce new spinlock to protect struct link_req

[~andy/linux] / net / tipc / discover.c

diff --git a/net/tipc/discover.c b/net/tipc/discover.c
index bc849f1efa167739d4831ea0f013f28541de2a79..412ff41b861166e5511ae3ad8c875fa27039ac6b 100644 (file)
--- a/net/tipc/discover.c
+++ b/net/tipc/discover.c
@@ -50,6 +50,7 @@
  * @dest: destination address for request messages
  * @domain: network domain to which links can be established
  * @num_nodes: number of nodes currently discovered (i.e. with an active link)
+ * @lock: spinlock for controlling access to requests
  * @buf: request message to be (repeatedly) sent
  * @timer: timer governing period between requests
  * @timer_intv: current interval between requests (in ms)
@@ -59,6 +60,7 @@ struct tipc_link_req {
        struct tipc_media_addr dest;
        u32 domain;
        int num_nodes;
+       spinlock_t lock;
        struct sk_buff *buf;
        struct timer_list timer;
        unsigned int timer_intv;
@@ -274,7 +276,9 @@ static void disc_update(struct tipc_link_req *req)
  */
 void tipc_disc_add_dest(struct tipc_link_req *req)
 {
+       spin_lock_bh(&req->lock);
        req->num_nodes++;
+       spin_unlock_bh(&req->lock);
 }
 
 /**
@@ -283,8 +287,10 @@ void tipc_disc_add_dest(struct tipc_link_req *req)
  */
 void tipc_disc_remove_dest(struct tipc_link_req *req)
 {
+       spin_lock_bh(&req->lock);
        req->num_nodes--;
        disc_update(req);
+       spin_unlock_bh(&req->lock);
 }
 
 /**
@@ -297,7 +303,7 @@ static void disc_timeout(struct tipc_link_req *req)
 {
        int max_delay;
 
-       spin_lock_bh(&req->bearer->lock);
+       spin_lock_bh(&req->lock);
 
        /* Stop searching if only desired node has been found */
        if (tipc_node(req->domain) && req->num_nodes) {
@@ -325,7 +331,7 @@ static void disc_timeout(struct tipc_link_req *req)
 
        k_start_timer(&req->timer, req->timer_intv);
 exit:
-       spin_unlock_bh(&req->bearer->lock);
+       spin_unlock_bh(&req->lock);
 }
 
 /**
@@ -356,6 +362,7 @@ int tipc_disc_create(struct tipc_bearer *b_ptr, struct tipc_media_addr *dest,
        req->domain = dest_domain;
        req->num_nodes = 0;
        req->timer_intv = TIPC_LINK_REQ_INIT;
+       spin_lock_init(&req->lock);
        k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req);
        k_start_timer(&req->timer, req->timer_intv);
        b_ptr->link_req = req;