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| author | Eric Dumazet <dada1@cosmosbay.com> | 2008-11-25 13:55:15 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-11-25 13:55:15 -0800 |
| commit | 723b46108f8ee75b61ce703d0c9225e4f537bc46 (patch) | |
| tree | f33c3d2b0e4f204a6b3f97ed198e1431a10ca448 /net/ipv4/udp.c | |
| parent | 5bc0b3bfa758e4ae49c94e31c1edb9a5f10a8060 (diff) | |
| download | linux-723b46108f8ee75b61ce703d0c9225e4f537bc46.tar.gz linux-723b46108f8ee75b61ce703d0c9225e4f537bc46.tar.bz2 linux-723b46108f8ee75b61ce703d0c9225e4f537bc46.zip | |
net: udp_unhash() can test if sk is hashed
Impact: Optimization
Like done in inet_unhash(), we can avoid taking a chain lock if
socket is not hashed in udp_unhash()
Triggered by close(socket(AF_INET, SOCK_DGRAM, 0));
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp.c')
| -rw-r--r-- | net/ipv4/udp.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 549114472db3..cf5ab0581eba 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -970,16 +970,18 @@ int udp_disconnect(struct sock *sk, int flags) void udp_lib_unhash(struct sock *sk) { - struct udp_table *udptable = sk->sk_prot->h.udp_table; - unsigned int hash = udp_hashfn(sock_net(sk), sk->sk_hash); - struct udp_hslot *hslot = &udptable->hash[hash]; + if (sk_hashed(sk)) { + struct udp_table *udptable = sk->sk_prot->h.udp_table; + unsigned int hash = udp_hashfn(sock_net(sk), sk->sk_hash); + struct udp_hslot *hslot = &udptable->hash[hash]; - spin_lock_bh(&hslot->lock); - if (sk_nulls_del_node_init_rcu(sk)) { - inet_sk(sk)->num = 0; - sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); + spin_lock_bh(&hslot->lock); + if (sk_nulls_del_node_init_rcu(sk)) { + inet_sk(sk)->num = 0; + sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); + } + spin_unlock_bh(&hslot->lock); } - spin_unlock_bh(&hslot->lock); } EXPORT_SYMBOL(udp_lib_unhash); |