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: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index b5dad899..a62097e 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -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;
+
+ rcu_read_unlock();
+
if (!type && !modload_attempted) {
- rcu_read_unlock();
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;
+
+ rcu_read_unlock();
if (!mode && !modload_attempted) {
- rcu_read_unlock();
request_module("xfrm-mode-%d-%d", family, encap);
modload_attempted = 1;
goto retry;
}
- rcu_read_unlock();
return mode;
}