From 28aecb9d7728dc26bf03ce7925fe622023a83a2a Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Fri, 29 Jan 2010 04:05:52 +0000 Subject: [PATCH] xfrm: avoid spinlock in get_acqseq() Use atomic_inc_return() in get_acqseq() to avoid taking a spinlock Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/key/af_key.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/net/key/af_key.c b/net/key/af_key.c index 4744b1f6372f..e2aacf0ba013 100644 --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -3019,12 +3019,11 @@ static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_e static u32 get_acqseq(void) { u32 res; - static u32 acqseq; - static DEFINE_SPINLOCK(acqseq_lock); + static atomic_t acqseq; - spin_lock_bh(&acqseq_lock); - res = (++acqseq ? : ++acqseq); - spin_unlock_bh(&acqseq_lock); + do { + res = atomic_inc_return(&acqseq); + } while (!res); return res; } -- 2.20.1