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authorEric Dumazet <edumazet@google.com>2012-10-22 00:06:56 +0400
committerDavid S. Miller <davem@davemloft.net>2012-10-22 22:29:06 +0400
commit0e71c55c9e3eb32de08e17152ec739582afc9400 (patch)
treee0e18744fb2d17cdf73193d6c2fcbfc296c7ebe3 /net/ipv4/tcp.c
parent354e4aa391ed50a4d827ff6fc11e0667d0859b25 (diff)
downloadlinux-0e71c55c9e3eb32de08e17152ec739582afc9400.tar.xz
tcp: speedup SIOCINQ ioctl
SIOCINQ can use the lock_sock_fast() version to avoid double acquisition of socket lock. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp.c')
-rw-r--r--net/ipv4/tcp.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index b7c2f439b54f..eace049da052 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -536,13 +536,14 @@ int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
struct tcp_sock *tp = tcp_sk(sk);
int answ;
+ bool slow;
switch (cmd) {
case SIOCINQ:
if (sk->sk_state == TCP_LISTEN)
return -EINVAL;
- lock_sock(sk);
+ slow = lock_sock_fast(sk);
if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))
answ = 0;
else if (sock_flag(sk, SOCK_URGINLINE) ||
@@ -557,7 +558,7 @@ int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg)
answ--;
} else
answ = tp->urg_seq - tp->copied_seq;
- release_sock(sk);
+ unlock_sock_fast(sk, slow);
break;
case SIOCATMARK:
answ = tp->urg_data && tp->urg_seq == tp->copied_seq;