1 files changed, 34 insertions, 24 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index b469c8b5461..44b64a593c0 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -46,45 +46,43 @@ static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
 
 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
+static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family);
+static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo);
 
 int xfrm_register_type(struct xfrm_type *type, unsigned short family)
 {
-	struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
-	struct xfrm_type_map *typemap;
+	struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
+	struct xfrm_type **typemap;
 	int err = 0;
 
 	if (unlikely(afinfo == NULL))
 		return -EAFNOSUPPORT;
 	typemap = afinfo->type_map;
 
-	write_lock_bh(&typemap->lock);
-	if (likely(typemap->map[type->proto] == NULL))
-		typemap->map[type->proto] = type;
+	if (likely(typemap[type->proto] == NULL))
+		typemap[type->proto] = type;
 	else
 		err = -EEXIST;
-	write_unlock_bh(&typemap->lock);
-	xfrm_policy_put_afinfo(afinfo);
+	xfrm_policy_unlock_afinfo(afinfo);
 	return err;
 }
 EXPORT_SYMBOL(xfrm_register_type);
 
 int xfrm_unregister_type(struct xfrm_type *type, unsigned short family)
 {
-	struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
-	struct xfrm_type_map *typemap;
+	struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
+	struct xfrm_type **typemap;
 	int err = 0;
 
 	if (unlikely(afinfo == NULL))
 		return -EAFNOSUPPORT;
 	typemap = afinfo->type_map;
 
-	write_lock_bh(&typemap->lock);
-	if (unlikely(typemap->map[type->proto] != type))
+	if (unlikely(typemap[type->proto] != type))
 		err = -ENOENT;
 	else
-		typemap->map[type->proto] = NULL;
-	write_unlock_bh(&typemap->lock);
-	xfrm_policy_put_afinfo(afinfo);
+		typemap[type->proto] = NULL;
+	xfrm_policy_unlock_afinfo(afinfo);
 	return err;
 }
 EXPORT_SYMBOL(xfrm_unregister_type);
@@ -92,7 +90,7 @@ EXPORT_SYMBOL(xfrm_unregister_type);
 struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
 {
 	struct xfrm_policy_afinfo *afinfo;
-	struct xfrm_type_map *typemap;
+	struct xfrm_type **typemap;
 	struct xfrm_type *type;
 	int modload_attempted = 0;
 
@@ -102,11 +100,9 @@ retry:
 		return NULL;
 	typemap = afinfo->type_map;
 
-	read_lock(&typemap->lock);
-	type = typemap->map[proto];
+	type = typemap[proto];
 	if (unlikely(type && !try_module_get(type->owner)))
 		type = NULL;
-	read_unlock(&typemap->lock);
 	if (!type && !modload_attempted) {
 		xfrm_policy_put_afinfo(afinfo);
 		request_module("xfrm-type-%d-%d",
@@ -1306,17 +1302,31 @@ static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
 		return NULL;
 	read_lock(&xfrm_policy_afinfo_lock);
 	afinfo = xfrm_policy_afinfo[family];
-	if (likely(afinfo != NULL))
-		read_lock(&afinfo->lock);
-	read_unlock(&xfrm_policy_afinfo_lock);
+	if (unlikely(!afinfo))
+		read_unlock(&xfrm_policy_afinfo_lock);
 	return afinfo;
 }
 
 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
 {
-	if (unlikely(afinfo == NULL))
-		return;
-	read_unlock(&afinfo->lock);
+	read_unlock(&xfrm_policy_afinfo_lock);
+}
+
+static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family)
+{
+	struct xfrm_policy_afinfo *afinfo;
+	if (unlikely(family >= NPROTO))
+		return NULL;
+	write_lock_bh(&xfrm_policy_afinfo_lock);
+	afinfo = xfrm_policy_afinfo[family];
+	if (unlikely(!afinfo))
+		write_unlock_bh(&xfrm_policy_afinfo_lock);
+	return afinfo;
+}
+
+static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo)
+{
+	write_unlock_bh(&xfrm_policy_afinfo_lock);
 }
 
 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)