bridge: Simplify pvid checks.

Currently, if the pvid is not set, we return an illegal vlan value
even though the pvid value is set to 0.  Since pvid of 0 is currently
invalid, just return 0 instead.  This makes the current and future
checks simpler.

Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 4 insertions, 7 deletions

diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 5a347eb1d139..f671561b3053 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -643,11 +643,8 @@ static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 
 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 {
-        /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
-         * vid wasn't set
-         */
         smp_rmb();
-        return v->pvid ?: VLAN_N_VID;
+        return v->pvid;
 }
 
 static inline int br_vlan_enabled(struct net_bridge *br)
@@ -746,7 +743,7 @@ static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 }
 static inline u16 br_get_pvid(const struct net_port_vlans *v)
 {
-        return VLAN_N_VID;      /* Returns invalid vid */
+        return 0;
 }
 
 static inline int br_vlan_enabled(struct net_bridge *br)
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index dfa7c9a7e193..e11c9932e706 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -223,7 +223,7 @@ bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
                  * See if pvid is set on this port.  That tells us which
                  * vlan untagged or priority-tagged traffic belongs to.
                  */
-                if (pvid == VLAN_N_VID)
+                if (!pvid)
                         goto drop;
 
                 /* PVID is set on this port.  Any untagged or priority-tagged
@@ -292,7 +292,7 @@ bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
 
         if (!*vid) {
                 *vid = br_get_pvid(v);
-                if (*vid == VLAN_N_VID)
+                if (!*vid)
                         return false;
 
                 return true;