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>
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@ -3019,12 +3019,11 @@ static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_e
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static u32 get_acqseq(void)
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{
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u32 res;
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static u32 acqseq;
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static DEFINE_SPINLOCK(acqseq_lock);
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static atomic_t acqseq;
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spin_lock_bh(&acqseq_lock);
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res = (++acqseq ? : ++acqseq);
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spin_unlock_bh(&acqseq_lock);
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do {
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res = atomic_inc_return(&acqseq);
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} while (!res);
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return res;
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}
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