net: convert syn_wait_lock to a spinlock

This is a low hanging fruit, as we'll get rid of syn_wait_lock eventually.

We hold syn_wait_lock for such small sections, that it makes no sense to use
a read/write lock. A spin lock is simply faster.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index f984b2001d0a..76322c9867d5 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -728,7 +728,7 @@ static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 
         entry.family = sk->sk_family;
 
-        read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
+        spin_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 
         lopt = icsk->icsk_accept_queue.listen_opt;
         if (!lopt || !listen_sock_qlen(lopt))
@@ -776,7 +776,7 @@ static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
         }
 
 out:
-        read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
+        spin_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
 
         return err;
 }