netns: remove one sparse warning

Eric Dumazet · davem330 · commit 416c51e17b8b · 2014-09-09T20:10:45.000-07:00
net/core/net_namespace.c:227:18: warning: incorrect type in argument 1
(different address spaces)
net/core/net_namespace.c:227:18:    expected void const *&lt;noident&gt;
net/core/net_namespace.c:227:18:    got struct net_generic [noderef]
&lt;asn:4&gt;*gen

We can use rcu_access_pointer() here as read-side access to the pointer
was removed at least one grace period ago.

Signed-off-by: Eric Dumazet &lt;edumazet@google.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
@@ -224,7 +224,7 @@ static void net_free(struct net *net)
 		return;
 	}
 #endif
-	kfree(net->gen);
+	kfree(rcu_access_pointer(net->gen));
 	kmem_cache_free(net_cachep, net);
 }
 

Original file line number	Diff line number	Diff line change
`@@ -224,7 +224,7 @@ static void net_free(struct net *net)`
`224`	`224`	`return;`
`225`	`225`	`}`
`226`	`226`	`#endif`
`227`		`- kfree(net->gen);`
	`227`	`+ kfree(rcu_access_pointer(net->gen));`
`228`	`228`	`kmem_cache_free(net_cachep, net);`
`229`	`229`	`}`
`230`	`230`