1 files changed, 1 insertions, 137 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 70ec57b887f6..b5006a091fd6 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -45,8 +45,6 @@ struct xfrm_flo {
 	u8 flags;
 };
 
-static DEFINE_PER_CPU(struct xfrm_dst *, xfrm_last_dst);
-static struct work_struct *xfrm_pcpu_work __read_mostly;
 static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
 static struct xfrm_policy_afinfo const __rcu *xfrm_policy_afinfo[AF_INET6 + 1]
 						__read_mostly;
@@ -1715,108 +1713,6 @@ static int xfrm_expand_policies(const struct flowi *fl, u16 family,
 
 }
 
-static void xfrm_last_dst_update(struct xfrm_dst *xdst, struct xfrm_dst *old)
-{
-	this_cpu_write(xfrm_last_dst, xdst);
-	if (old)
-		dst_release(&old->u.dst);
-}
-
-static void __xfrm_pcpu_work_fn(void)
-{
-	struct xfrm_dst *old;
-
-	old = this_cpu_read(xfrm_last_dst);
-	if (old && !xfrm_bundle_ok(old))
-		xfrm_last_dst_update(NULL, old);
-}
-
-static void xfrm_pcpu_work_fn(struct work_struct *work)
-{
-	local_bh_disable();
-	rcu_read_lock();
-	__xfrm_pcpu_work_fn();
-	rcu_read_unlock();
-	local_bh_enable();
-}
-
-void xfrm_policy_cache_flush(void)
-{
-	struct xfrm_dst *old;
-	bool found = 0;
-	int cpu;
-
-	might_sleep();
-
-	local_bh_disable();
-	rcu_read_lock();
-	for_each_possible_cpu(cpu) {
-		old = per_cpu(xfrm_last_dst, cpu);
-		if (old && !xfrm_bundle_ok(old)) {
-			if (smp_processor_id() == cpu) {
-				__xfrm_pcpu_work_fn();
-				continue;
-			}
-			found = true;
-			break;
-		}
-	}
-
-	rcu_read_unlock();
-	local_bh_enable();
-
-	if (!found)
-		return;
-
-	get_online_cpus();
-
-	for_each_possible_cpu(cpu) {
-		bool bundle_release;
-
-		rcu_read_lock();
-		old = per_cpu(xfrm_last_dst, cpu);
-		bundle_release = old && !xfrm_bundle_ok(old);
-		rcu_read_unlock();
-
-		if (!bundle_release)
-			continue;
-
-		if (cpu_online(cpu)) {
-			schedule_work_on(cpu, &xfrm_pcpu_work[cpu]);
-			continue;
-		}
-
-		rcu_read_lock();
-		old = per_cpu(xfrm_last_dst, cpu);
-		if (old && !xfrm_bundle_ok(old)) {
-			per_cpu(xfrm_last_dst, cpu) = NULL;
-			dst_release(&old->u.dst);
-		}
-		rcu_read_unlock();
-	}
-
-	put_online_cpus();
-}
-
-static bool xfrm_xdst_can_reuse(struct xfrm_dst *xdst,
-				struct xfrm_state * const xfrm[],
-				int num)
-{
-	const struct dst_entry *dst = &xdst->u.dst;
-	int i;
-
-	if (xdst->num_xfrms != num)
-		return false;
-
-	for (i = 0; i < num; i++) {
-		if (!dst || dst->xfrm != xfrm[i])
-			return false;
-		dst = dst->child;
-	}
-
-	return xfrm_bundle_ok(xdst);
-}
-
 static struct xfrm_dst *
 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
 			       const struct flowi *fl, u16 family,
@@ -1824,7 +1720,7 @@ xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
 {
 	struct net *net = xp_net(pols[0]);
 	struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
-	struct xfrm_dst *xdst, *old;
+	struct xfrm_dst *xdst;
 	struct dst_entry *dst;
 	int err;
 
@@ -1839,21 +1735,6 @@ xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
 		return ERR_PTR(err);
 	}
 
-	xdst = this_cpu_read(xfrm_last_dst);
-	if (xdst &&
-	    xdst->u.dst.dev == dst_orig->dev &&
-	    xdst->num_pols == num_pols &&
-	    memcmp(xdst->pols, pols,
-		   sizeof(struct xfrm_policy *) * num_pols) == 0 &&
-	    xfrm_xdst_can_reuse(xdst, xfrm, err)) {
-		dst_hold(&xdst->u.dst);
-		while (err > 0)
-			xfrm_state_put(xfrm[--err]);
-		return xdst;
-	}
-
-	old = xdst;
-
 	dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
 	if (IS_ERR(dst)) {
 		XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
@@ -1866,9 +1747,6 @@ xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
 	memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
 	xdst->policy_genid = atomic_read(&pols[0]->genid);
 
-	atomic_set(&xdst->u.dst.__refcnt, 2);
-	xfrm_last_dst_update(xdst, old);
-
 	return xdst;
 }
 
@@ -2069,11 +1947,8 @@ xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
 	if (num_xfrms <= 0)
 		goto make_dummy_bundle;
 
-	local_bh_disable();
 	xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
 					      xflo->dst_orig);
-	local_bh_enable();
-
 	if (IS_ERR(xdst)) {
 		err = PTR_ERR(xdst);
 		if (err != -EAGAIN)
@@ -2160,11 +2035,9 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
 				goto no_transform;
 			}
 
-			local_bh_disable();
 			xdst = xfrm_resolve_and_create_bundle(
 					pols, num_pols, fl,
 					family, dst_orig);
-			local_bh_enable();
 
 			if (IS_ERR(xdst)) {
 				xfrm_pols_put(pols, num_pols);
@@ -2992,15 +2865,6 @@ static struct pernet_operations __net_initdata xfrm_net_ops = {
 
 void __init xfrm_init(void)
 {
-	int i;
-
-	xfrm_pcpu_work = kmalloc_array(NR_CPUS, sizeof(*xfrm_pcpu_work),
-				       GFP_KERNEL);
-	BUG_ON(!xfrm_pcpu_work);
-
-	for (i = 0; i < NR_CPUS; i++)
-		INIT_WORK(&xfrm_pcpu_work[i], xfrm_pcpu_work_fn);
-
 	register_pernet_subsys(&xfrm_net_ops);
 	seqcount_init(&xfrm_policy_hash_generation);
 	xfrm_input_init();