net/ipv4/igmp.c: Replace rcu_dereference() with rcu_access_pointer()

The "rcu_dereference()" call is used directly in a condition.
Since its return value is never dereferenced it is recommended to use
"rcu_access_pointer()" instead of "rcu_dereference()".
Therefore, this patch makes the replacement.

The following Coccinelle semantic patch was used:
@@
@@

(
 if(
 (<+...
- rcu_dereference
+ rcu_access_pointer
  (...)
  ...+>)) {...}
|
 while(
 (<+...
- rcu_dereference
+ rcu_access_pointer
  (...)
  ...+>)) {...}
)

Signed-off-by: Andreea-Cristina Bernat <bernat.ada@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index f10eab4..890c425 100644 (file)
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -2539,7 +2539,7 @@ static int igmp_mc_seq_show(struct seq_file *seq, void *v)
                querier = "NONE";
 #endif
 
-               if (rcu_dereference(state->in_dev->mc_list) == im) {
+               if (rcu_access_pointer(state->in_dev->mc_list) == im) {
                        seq_printf(seq, "%d\t%-10s: %5d %7s\n",
                                   state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
                }