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

From: Andreea-Cristina Bernat
Date: Sun Aug 17 2014 - 08:49:58 EST


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@xxxxxxxxx>
---
net/ipv4/igmp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 6748d42..94a96ad 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -2537,7 +2537,7 @@ 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);
}
--
1.9.1

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