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Commit 28aecb9d authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

xfrm: avoid spinlock in get_acqseq() 



Use atomic_inc_return() in get_acqseq() to avoid taking a spinlock

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d1c9ae6d

net/key/af_key.c

+4 −5
Original line number Diff line number Diff line
@@ -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;

}