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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-01-29 04:05:52 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-02-02 15:55:41 -0800 |
| commit | 28aecb9d7728dc26bf03ce7925fe622023a83a2a (patch) | |
| tree | b5adad3e5ba77bb00e13a81eea5823bc0d76fb82 /net | |
| parent | d1c9ae6d1e7b95cedc8e39e8949e795379a0669e (diff) | |
| download | lwn-28aecb9d7728dc26bf03ce7925fe622023a83a2a.tar.gz lwn-28aecb9d7728dc26bf03ce7925fe622023a83a2a.zip | |
xfrm: avoid spinlock in get_acqseq()
Use atomic_inc_return() in get_acqseq() to avoid taking a spinlock
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/key/af_key.c | 9 |
1 files 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; } |