From 711059b9752ad09ae6bcd4be8e48d30e5db483d8 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Mon, 9 Jan 2017 14:20:48 +0100 Subject: xfrm: add and use xfrm_state_afinfo_get_rcu xfrm_init_tempstate is always called from within rcu read side section. We can thus use a simpler function that doesn't call rcu_read_lock again. While at it, also make xfrm_init_tempstate return value void, the return value was never tested. A followup patch will replace remaining callers of xfrm_state_get_afinfo with xfrm_state_afinfo_get_rcu variant and then remove the 'old' get_afinfo interface. Signed-off-by: Florian Westphal Signed-off-by: Steffen Klassert --- net/xfrm/xfrm_state.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-) (limited to 'net/xfrm') diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index 783084484582..b5dad899fb0e 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -639,26 +639,23 @@ void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) } EXPORT_SYMBOL(xfrm_sad_getinfo); -static int +static void xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, const struct xfrm_tmpl *tmpl, const xfrm_address_t *daddr, const xfrm_address_t *saddr, unsigned short family) { - struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); - if (!afinfo) - return -1; - afinfo->init_tempsel(&x->sel, fl); + struct xfrm_state_afinfo *afinfo = xfrm_state_afinfo_get_rcu(family); + + if (afinfo) + afinfo->init_tempsel(&x->sel, fl); if (family != tmpl->encap_family) { - rcu_read_unlock(); - afinfo = xfrm_state_get_afinfo(tmpl->encap_family); + afinfo = xfrm_state_afinfo_get_rcu(tmpl->encap_family); if (!afinfo) - return -1; + return; } afinfo->init_temprop(x, tmpl, daddr, saddr); - rcu_read_unlock(); - return 0; } static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, @@ -1966,6 +1963,14 @@ int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) } EXPORT_SYMBOL(xfrm_state_unregister_afinfo); +struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family) +{ + if (unlikely(family >= NPROTO)) + return NULL; + + return rcu_dereference(xfrm_state_afinfo[family]); +} + struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) { struct xfrm_state_afinfo *afinfo; -- cgit v1.2.3