From 3154ee5364cf95cc3948589d870f6f6c957ba0a3 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 16 Jun 2009 05:40:30 -0700 Subject: [PATCH] x25: Fix sleep from timer on socket destroy. [ Upstream commit 14ebaf81e13ce66bff275380b246796fd16cbfa1 ] 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 Tested-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman --- include/net/x25.h | 2 +- net/x25/af_x25.c | 23 ++++++++++++++++++----- net/x25/x25_timer.c | 2 +- 3 files changed, 20 insertions(+), 7 deletions(-) diff --git a/include/net/x25.h b/include/net/x25.h index fc3f03d976f8..2cda04011568 100644 --- a/include/net/x25.h +++ b/include/net/x25.h @@ -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 *); diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c index 88d80f55facc..220a5e30d27d 100644 --- a/net/x25/af_x25.c +++ b/net/x25/af_x25.c @@ -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); } diff --git a/net/x25/x25_timer.c b/net/x25/x25_timer.c index d3e3e54db936..5c5db1a36399 100644 --- a/net/x25/x25_timer.c +++ b/net/x25/x25_timer.c @@ -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; -- 2.39.2