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 <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index 8cd2390b0d45..21cdc872004e 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -1271,8 +1271,8 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 
         switch (cmd) {
                 case TIOCOUTQ: {
-                        int amount = sk->sk_sndbuf -
-                                     atomic_read(&sk->sk_wmem_alloc);
+                        int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
+
                         if (amount < 0)
                                 amount = 0;
                         rc = put_user(amount, (unsigned int __user *)argp);