From c564039fd83ea16a86a96d52632794b24849e507 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Tue, 16 Jun 2009 10:12:03 +0000 Subject: net: sk_wmem_alloc has initial value of one, not zero commit 2b85a34e911bf483c27cfdd124aeb1605145dc80 (net: No more expensive sock_hold()/sock_put() on each tx) changed initial sk_wmem_alloc value. Some protocols check sk_wmem_alloc value to determine if a timer must delay socket deallocation. We must take care of the sk_wmem_alloc value being one instead of zero when no write allocations are pending. Reported by Ingo Molnar, and full diagnostic from David Miller. This patch introduces three helpers to get read/write allocations and a followup patch will use these helpers to report correct write allocations to user. Reported-by: Ingo Molnar Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/netrom/af_netrom.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'net/netrom/af_netrom.c') diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c index 3be0e01..cd91190 100644 --- a/net/netrom/af_netrom.c +++ b/net/netrom/af_netrom.c @@ -286,8 +286,7 @@ void nr_destroy_socket(struct sock *sk) kfree_skb(skb); } - if (atomic_read(&sk->sk_wmem_alloc) || - atomic_read(&sk->sk_rmem_alloc)) { + if (sk_has_allocations(sk)) { /* Defer: outstanding buffers */ sk->sk_timer.function = nr_destroy_timer; sk->sk_timer.expires = jiffies + 2 * HZ; -- cgit v1.1 From 31e6d363abcd0d05766c82f1a9c905a4c974a199 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 17 Jun 2009 19:05:41 -0700 Subject: net: correct off-by-one write allocations reports commit 2b85a34e911bf483c27cfdd124aeb1605145dc80 (net: No more expensive sock_hold()/sock_put() on each tx) changed initial sk_wmem_alloc value. We need to take into account this offset when reporting sk_wmem_alloc to user, in PROC_FS files or various ioctls (SIOCOUTQ/TIOCOUTQ) Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/netrom/af_netrom.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'net/netrom/af_netrom.c') diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c index cd91190..ce51ce0 100644 --- a/net/netrom/af_netrom.c +++ b/net/netrom/af_netrom.c @@ -1205,7 +1205,7 @@ static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) long amount; lock_sock(sk); - amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); + amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); if (amount < 0) amount = 0; release_sock(sk); @@ -1341,8 +1341,8 @@ static int nr_info_show(struct seq_file *seq, void *v) nr->n2count, nr->n2, nr->window, - atomic_read(&s->sk_wmem_alloc), - atomic_read(&s->sk_rmem_alloc), + sk_wmem_alloc_get(s), + sk_rmem_alloc_get(s), s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); bh_unlock_sock(s); -- cgit v1.1