net: decnet: Fix sleeping inside in af_decnet

The release_sock() is blocking function, it would change the state
after sleeping. use wait_woken() instead.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 5dbd45dc35ad3f44933b1fa1ba29ef4a7578249e..dc92a67baea39484cd4c93913d3eae8ac4463538 100644 (file)
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -816,7 +816,7 @@ static int dn_auto_bind(struct socket *sock)
 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 {
        struct dn_scp *scp = DN_SK(sk);
-       DEFINE_WAIT(wait);
+       DEFINE_WAIT_FUNC(wait, woken_wake_function);
        int err;
 
        if (scp->state != DN_CR)
@@ -826,11 +826,11 @@ static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
        scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
        dn_send_conn_conf(sk, allocation);
 
-       prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
+       add_wait_queue(sk_sleep(sk), &wait);
        for(;;) {
                release_sock(sk);
                if (scp->state == DN_CC)
-                       *timeo = schedule_timeout(*timeo);
+                       *timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
                lock_sock(sk);
                err = 0;
                if (scp->state == DN_RUN)
@@ -844,9 +844,8 @@ static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
                err = -EAGAIN;
                if (!*timeo)
                        break;
-               prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
        }
-       finish_wait(sk_sleep(sk), &wait);
+       remove_wait_queue(sk_sleep(sk), &wait);
        if (err == 0) {
                sk->sk_socket->state = SS_CONNECTED;
        } else if (scp->state != DN_CC) {
@@ -858,7 +857,7 @@ static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 static int dn_wait_run(struct sock *sk, long *timeo)
 {
        struct dn_scp *scp = DN_SK(sk);
-       DEFINE_WAIT(wait);
+       DEFINE_WAIT_FUNC(wait, woken_wake_function);
        int err = 0;
 
        if (scp->state == DN_RUN)
@@ -867,11 +866,11 @@ static int dn_wait_run(struct sock *sk, long *timeo)
        if (!*timeo)
                return -EALREADY;
 
-       prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
+       add_wait_queue(sk_sleep(sk), &wait);
        for(;;) {
                release_sock(sk);
                if (scp->state == DN_CI || scp->state == DN_CC)
-                       *timeo = schedule_timeout(*timeo);
+                       *timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
                lock_sock(sk);
                err = 0;
                if (scp->state == DN_RUN)
@@ -885,9 +884,8 @@ static int dn_wait_run(struct sock *sk, long *timeo)
                err = -ETIMEDOUT;
                if (!*timeo)
                        break;
-               prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
        }
-       finish_wait(sk_sleep(sk), &wait);
+       remove_wait_queue(sk_sleep(sk), &wait);
 out:
        if (err == 0) {
                sk->sk_socket->state = SS_CONNECTED;
@@ -1032,16 +1030,16 @@ static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
 
 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
 {
-       DEFINE_WAIT(wait);
+       DEFINE_WAIT_FUNC(wait, woken_wake_function);
        struct sk_buff *skb = NULL;
        int err = 0;
 
-       prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
+       add_wait_queue(sk_sleep(sk), &wait);
        for(;;) {
                release_sock(sk);
                skb = skb_dequeue(&sk->sk_receive_queue);
                if (skb == NULL) {
-                       *timeo = schedule_timeout(*timeo);
+                       *timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
                        skb = skb_dequeue(&sk->sk_receive_queue);
                }
                lock_sock(sk);
@@ -1056,9 +1054,8 @@ static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
                err = -EAGAIN;
                if (!*timeo)
                        break;
-               prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
        }
-       finish_wait(sk_sleep(sk), &wait);
+       remove_wait_queue(sk_sleep(sk), &wait);
 
        return skb == NULL ? ERR_PTR(err) : skb;
 }