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authorNikolay Aleksandrov <nikolay@cumulusnetworks.com>2015-10-02 15:05:11 +0200
committerDavid S. Miller <davem@davemloft.net>2015-10-04 16:43:48 -0700
commitf8ed289fab843fbc9251aa2f5c3d416f09b5fc7e (patch)
treedb83a19d5ba3be7767076070dc8ee6b6650fab4a
parent586c2b573ee4c2c4ba03e16318a16614ebf876f8 (diff)
downloadblackbird-obmc-linux-f8ed289fab843fbc9251aa2f5c3d416f09b5fc7e.tar.gz
blackbird-obmc-linux-f8ed289fab843fbc9251aa2f5c3d416f09b5fc7e.zip
bridge: vlan: use br_vlan_(get|put)_master to deal with refcounts
Introduce br_vlan_(get|put)_master which take a reference (or create the master vlan first if it didn't exist) and drop a reference respectively. Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/bridge/br_vlan.c56
1 files changed, 39 insertions, 17 deletions
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index d97a55e97830..6e41fba47e97 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -146,6 +146,40 @@ static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
return err;
}
+/* Returns a master vlan, if it didn't exist it gets created. In all cases a
+ * a reference is taken to the master vlan before returning.
+ */
+static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid)
+{
+ struct net_bridge_vlan *masterv;
+
+ masterv = br_vlan_find(br->vlgrp, vid);
+ if (!masterv) {
+ /* missing global ctx, create it now */
+ if (br_vlan_add(br, vid, 0))
+ return NULL;
+ masterv = br_vlan_find(br->vlgrp, vid);
+ if (WARN_ON(!masterv))
+ return NULL;
+ }
+ atomic_inc(&masterv->refcnt);
+
+ return masterv;
+}
+
+static void br_vlan_put_master(struct net_bridge_vlan *masterv)
+{
+ if (!br_vlan_is_master(masterv))
+ return;
+
+ if (atomic_dec_and_test(&masterv->refcnt)) {
+ rhashtable_remove_fast(&masterv->br->vlgrp->vlan_hash,
+ &masterv->vnode, br_vlan_rht_params);
+ __vlan_del_list(masterv);
+ kfree_rcu(masterv, rcu);
+ }
+}
+
/* This is the shared VLAN add function which works for both ports and bridge
* devices. There are four possible calls to this function in terms of the
* vlan entry type:
@@ -196,16 +230,9 @@ static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
goto out_filt;
}
- masterv = br_vlan_find(br->vlgrp, v->vid);
- if (!masterv) {
- /* missing global ctx, create it now */
- err = br_vlan_add(br, v->vid, 0);
- if (err)
- goto out_filt;
- masterv = br_vlan_find(br->vlgrp, v->vid);
- WARN_ON(!masterv);
- }
- atomic_inc(&masterv->refcnt);
+ masterv = br_vlan_get_master(br, v->vid);
+ if (!masterv)
+ goto out_filt;
v->brvlan = masterv;
}
@@ -240,7 +267,7 @@ out_filt:
if (p) {
__vlan_vid_del(dev, br, v->vid);
if (masterv) {
- atomic_dec(&masterv->refcnt);
+ br_vlan_put_master(masterv);
v->brvlan = NULL;
}
}
@@ -289,12 +316,7 @@ static int __vlan_del(struct net_bridge_vlan *v)
kfree_rcu(v, rcu);
}
- if (atomic_dec_and_test(&masterv->refcnt)) {
- rhashtable_remove_fast(&masterv->br->vlgrp->vlan_hash,
- &masterv->vnode, br_vlan_rht_params);
- __vlan_del_list(masterv);
- kfree_rcu(masterv, rcu);
- }
+ br_vlan_put_master(masterv);
out:
return err;
}
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