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x25: Fix sleep from timer on socket destroy.

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If socket destuction gets delayed to a timer, we try to
lock_sock() from that timer which won't work.

Use bh_lock_sock() in that case.

Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
David S. Miller 2009-06-16 05:40:30 -07:00
parent a1870b9cc2
commit 14ebaf81e1
3 changed files with 20 additions and 7 deletions
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2
include/net/x25.h
View file

@ -187,7 +187,7 @@ extern int x25_addr_ntoa(unsigned char *, struct x25_address *,
extern int x25_addr_aton(unsigned char *, struct x25_address *,
struct x25_address *);
extern struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
extern void x25_destroy_socket(struct sock *);
extern void x25_destroy_socket_from_timer(struct sock *);
extern int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
extern void x25_kill_by_neigh(struct x25_neigh *);

23
net/x25/af_x25.c
View file

@ -332,14 +332,14 @@ static unsigned int x25_new_lci(struct x25_neigh *nb)
/*
* Deferred destroy.
*/
void x25_destroy_socket(struct sock *);
static void __x25_destroy_socket(struct sock *);
/*
* handler for deferred kills.
*/
static void x25_destroy_timer(unsigned long data)
{
x25_destroy_socket((struct sock *)data);
x25_destroy_socket_from_timer((struct sock *)data);
}
/*
@ -349,12 +349,10 @@ static void x25_destroy_timer(unsigned long data)
* will touch it and we are (fairly 8-) ) safe.
* Not static as it's used by the timer
*/
void x25_destroy_socket(struct sock *sk)
static void __x25_destroy_socket(struct sock *sk)
{
struct sk_buff *skb;
sock_hold(sk);
lock_sock(sk);
x25_stop_heartbeat(sk);
x25_stop_timer(sk);
@ -385,7 +383,22 @@ void x25_destroy_socket(struct sock *sk)
/* drop last reference so sock_put will free */
__sock_put(sk);
}
}
void x25_destroy_socket_from_timer(struct sock *sk)
{
sock_hold(sk);
bh_lock_sock(sk);
__x25_destroy_socket(sk);
bh_unlock_sock(sk);
sock_put(sk);
}
static void x25_destroy_socket(struct sock *sk)
{
sock_hold(sk);
lock_sock(sk);
__x25_destroy_socket(sk);
release_sock(sk);
sock_put(sk);
}

2
net/x25/x25_timer.c
View file

@ -113,7 +113,7 @@ static void x25_heartbeat_expiry(unsigned long param)
(sk->sk_state == TCP_LISTEN &&
sock_flag(sk, SOCK_DEAD))) {
bh_unlock_sock(sk);
x25_destroy_socket(sk);
x25_destroy_socket_from_timer(sk);
return;
}
break;