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net: build_ehash_secret() and rt_bind_peer() cleanups 

Now cmpxchg() is available on all arches, we can use it in
build_ehash_secret() and rt_bind_peer() instead of using spinlocks.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-08-19 06:10:45 +00:00 committed by David S. Miller
parent 4da79504b2
commit 49e8ab03eb
2 changed files with 4 additions and 13 deletions
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8
net/ipv4/af_inet.c
View File

@ -227,18 +227,16 @@ EXPORT_SYMBOL(inet_ehash_secret);
/* /*
* inet_ehash_secret must be set exactly once * inet_ehash_secret must be set exactly once
* Instead of using a dedicated spinlock, we (ab)use inetsw_lock
*/ */
void build_ehash_secret(void) void build_ehash_secret(void)
{ {
u32 rnd; u32 rnd;
do { do {
get_random_bytes(&rnd, sizeof(rnd)); get_random_bytes(&rnd, sizeof(rnd));
} while (rnd == 0); } while (rnd == 0);
spin_lock_bh(&inetsw_lock);
if (!inet_ehash_secret) cmpxchg(&inet_ehash_secret, 0, rnd);
inet_ehash_secret = rnd;
spin_unlock_bh(&inetsw_lock);
} }
EXPORT_SYMBOL(build_ehash_secret); EXPORT_SYMBOL(build_ehash_secret);

9
net/ipv4/route.c
View File

@ -1268,18 +1268,11 @@ skip_hashing:
void rt_bind_peer(struct rtable *rt, int create) void rt_bind_peer(struct rtable *rt, int create)
{ {
static DEFINE_SPINLOCK(rt_peer_lock);
struct inet_peer *peer; struct inet_peer *peer;
peer = inet_getpeer(rt->rt_dst, create); peer = inet_getpeer(rt->rt_dst, create);
spin_lock_bh(&rt_peer_lock); if (peer && cmpxchg(&rt->peer, NULL, peer) != NULL)
if (rt->peer == NULL) {
rt->peer = peer;
peer = NULL;
}
spin_unlock_bh(&rt_peer_lock);
if (peer)
inet_putpeer(peer); inet_putpeer(peer);
} }