Commit 75cda62d authored by Florian Westphal's avatar Florian Westphal Committed by Steffen Klassert
Browse files

xfrm: state: simplify rcu_read_unlock handling in two spots 



Instead of:
  if (foo) {
      unlock();
      return bar();
   }
   unlock();
do:
   unlock();
   if (foo)
       return bar();

This is ok because rcu protected structure is only dereferenced before
the conditional.

Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent 711059b9

net/xfrm/xfrm_state.c

+7 −6
Original line number Diff line number Diff line
@@ -231,17 +231,18 @@ static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) 
		return NULL;

	typemap = afinfo->type_map;



	type = typemap[proto];

	type = READ_ONCE(typemap[proto]);

	if (unlikely(type && !try_module_get(type->owner)))

		type = NULL;

	if (!type && !modload_attempted) {



	rcu_read_unlock();



	if (!type && !modload_attempted) {

		request_module("xfrm-type-%d-%d", family, proto);

		modload_attempted = 1;

		goto retry;

	}



	rcu_read_unlock();

	return type;

}
@@ -327,17 +328,17 @@ static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) 
	if (unlikely(afinfo == NULL))

		return NULL;



	mode = afinfo->mode_map[encap];

	mode = READ_ONCE(afinfo->mode_map[encap]);

	if (unlikely(mode && !try_module_get(mode->owner)))

		mode = NULL;

	if (!mode && !modload_attempted) {



	rcu_read_unlock();

	if (!mode && !modload_attempted) {

		request_module("xfrm-mode-%d-%d", family, encap);

		modload_attempted = 1;

		goto retry;

	}



	rcu_read_unlock();

	return mode;

}