pipe: fix pipe buffer resizing

[safe/jmp/linux-2.6] / net / llc / llc_core.c

diff --git a/net/llc/llc_core.c b/net/llc/llc_core.c
index 0c9ef8b..2bb0ddf 100644 (file)
--- a/net/llc/llc_core.c
+++ b/net/llc/llc_core.c
@@ -23,7 +23,7 @@
 #include <net/llc.h>
 
 LIST_HEAD(llc_sap_list);
-DEFINE_RWLOCK(llc_sap_list_lock);
+DEFINE_SPINLOCK(llc_sap_list_lock);
 
 /**
  *     llc_sap_alloc - allocates and initializes sap.
@@ -46,30 +46,6 @@ static struct llc_sap *llc_sap_alloc(void)
        return sap;
 }
 
-/**
- *     llc_add_sap - add sap to station list
- *     @sap: Address of the sap
- *
- *     Adds a sap to the LLC's station sap list.
- */
-static void llc_add_sap(struct llc_sap *sap)
-{
-       list_add_tail(&sap->node, &llc_sap_list);
-}
-
-/**
- *     llc_del_sap - del sap from station list
- *     @sap: Address of the sap
- *
- *     Removes a sap to the LLC's station sap list.
- */
-static void llc_del_sap(struct llc_sap *sap)
-{
-       write_lock_bh(&llc_sap_list_lock);
-       list_del(&sap->node);
-       write_unlock_bh(&llc_sap_list_lock);
-}
-
 static struct llc_sap *__llc_sap_find(unsigned char sap_value)
 {
        struct llc_sap* sap;
@@ -93,13 +69,13 @@ out:
  */
 struct llc_sap *llc_sap_find(unsigned char sap_value)
 {
-       struct llc_sap* sap;
+       struct llc_sap *sap;
 
-       read_lock_bh(&llc_sap_list_lock);
+       rcu_read_lock_bh();
        sap = __llc_sap_find(sap_value);
        if (sap)
                llc_sap_hold(sap);
-       read_unlock_bh(&llc_sap_list_lock);
+       rcu_read_unlock_bh();
        return sap;
 }
 
@@ -120,7 +96,7 @@ struct llc_sap *llc_sap_open(unsigned char lsap,
 {
        struct llc_sap *sap = NULL;
 
-       write_lock_bh(&llc_sap_list_lock);
+       spin_lock_bh(&llc_sap_list_lock);
        if (__llc_sap_find(lsap)) /* SAP already exists */
                goto out;
        sap = llc_sap_alloc();
@@ -128,9 +104,9 @@ struct llc_sap *llc_sap_open(unsigned char lsap,
                goto out;
        sap->laddr.lsap = lsap;
        sap->rcv_func   = func;
-       llc_add_sap(sap);
+       list_add_tail_rcu(&sap->node, &llc_sap_list);
 out:
-       write_unlock_bh(&llc_sap_list_lock);
+       spin_unlock_bh(&llc_sap_list_lock);
        return sap;
 }
 
@@ -146,7 +122,13 @@ out:
 void llc_sap_close(struct llc_sap *sap)
 {
        WARN_ON(sap->sk_count);
-       llc_del_sap(sap);
+
+       spin_lock_bh(&llc_sap_list_lock);
+       list_del_rcu(&sap->node);
+       spin_unlock_bh(&llc_sap_list_lock);
+
+       synchronize_rcu();
+
        kfree(sap);
 }
 
@@ -162,12 +144,6 @@ static struct packet_type llc_tr_packet_type __read_mostly = {
 
 static int __init llc_init(void)
 {
-       struct net_device *dev;
-
-       dev = first_net_device(&init_net);
-       if (dev != NULL)
-               dev = next_net_device(dev);
-
        dev_add_pack(&llc_packet_type);
        dev_add_pack(&llc_tr_packet_type);
        return 0;