[PATCH 15/20] xfrm: add rcu_access_pointer to silence sparse warning for xfrm_input_afinfo

[Steffen Klassert <steffen.klassert@secunet.com>]

From: Sabrina Dubroca <sd@queasysnail.net>

xfrm_input_afinfo is __rcu, we should use rcu_access_pointer to avoid
a sparse warning:
net/xfrm/xfrm_input.c:78:21: error: incompatible types in comparison expression (different address spaces):
net/xfrm/xfrm_input.c:78:21:    struct xfrm_input_afinfo const [noderef] __rcu *
net/xfrm/xfrm_input.c:78:21:    struct xfrm_input_afinfo const *

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
---
 net/xfrm/xfrm_input.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 4ed346e682c7..dc1312ed5a09 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -75,7 +75,10 @@ int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
 
 	spin_lock_bh(&xfrm_input_afinfo_lock);
 	if (likely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) {
-		if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family] != afinfo))
+		const struct xfrm_input_afinfo *cur;
+
+		cur = rcu_access_pointer(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family]);
+		if (unlikely(cur != afinfo))
 			err = -EINVAL;
 		else
 			RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], NULL);
-- 
2.43.0