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authorJohannes Berg <johannes.berg@intel.com>2011-05-14 11:00:52 +0200
committerJohn W. Linville <linville@tuxdriver.com>2011-05-16 14:25:29 -0400
commit1928ecab620907a0953f811316d05f367f3f4dba (patch)
treec97ce24a7d86ad58c148ef8905c72c5705d12f4a /net/mac80211/mesh.h
parentd07c7cf49ae7c488e778c4d668f4cc10bd2fa971 (diff)
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mac80211: fix and simplify mesh locking
The locking in mesh_{mpath,mpp}_table_grow not only has an rcu_read_unlock() missing, it's also racy (though really only technically since it's invoked from a single function only) since it obtains the new size of the table without any locking, so two invocations of the function could attempt the same resize. Additionally, it uses synchronize_rcu() which is rather expensive and can be avoided trivially here. Modify the functions to only use the table lock and use call_rcu() instead of synchronize_rcu(). Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/mesh.h')
-rw-r--r--net/mac80211/mesh.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/mac80211/mesh.h b/net/mac80211/mesh.h
index e7c5fdd..eb733c0 100644
--- a/net/mac80211/mesh.h
+++ b/net/mac80211/mesh.h
@@ -120,6 +120,7 @@ struct mesh_path {
* buckets
* @mean_chain_len: maximum average length for the hash buckets' list, if it is
* reached, the table will grow
+ * rcu_head: RCU head to free the table
*/
struct mesh_table {
/* Number of buckets will be 2^N */
@@ -132,6 +133,8 @@ struct mesh_table {
int (*copy_node) (struct hlist_node *p, struct mesh_table *newtbl);
int size_order;
int mean_chain_len;
+
+ struct rcu_head rcu_head;
};
/* Recent multicast cache */