[PATCH net v3 1/2] bridge: implement missing ndo_uninit()

[idosch]

From: Ido Schimmel <ido...@mellanox.com>

While the bridge driver implements an ndo_init(), it was missing a
symmetric ndo_uninit(), causing the different de-initialization
operations to be scattered around its dellink() and destructor().

Implement a symmetric ndo_uninit() and remove the overlapping operations
from its dellink() and destructor().

This is a prerequisite for the next patch, as it allows us to have a
proper cleanup upon changelink() failure during the bridge's newlink().

Fixes: b6677449dff6 ("bridge: netlink: call br_changelink() during 
br_dev_newlink()")
Signed-off-by: Nikolay Aleksandrov <niko...@cumulusnetworks.com>
Signed-off-by: Ido Schimmel <ido...@mellanox.com>
---
v2->v3:
* Use free_netdev() for destructor()
v1->v2:
* New patch

 net/bridge/br_device.c    | 20 +++++++++++---------
 net/bridge/br_if.c        |  1 -
 net/bridge/br_multicast.c |  7 +++++--
 net/bridge/br_private.h   |  5 +++++
 4 files changed, 21 insertions(+), 12 deletions(-)

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index ea71513..90f49a1 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -119,6 +119,15 @@ static int br_dev_init(struct net_device *dev)
        return err;
 }
 
+static void br_dev_uninit(struct net_device *dev)
+{
+       struct net_bridge *br = netdev_priv(dev);
+
+       br_multicast_uninit_stats(br);
+       br_vlan_flush(br);
+       free_percpu(br->stats);
+}
+
 static int br_dev_open(struct net_device *dev)
 {
        struct net_bridge *br = netdev_priv(dev);
@@ -332,6 +341,7 @@ static const struct net_device_ops br_netdev_ops = {
        .ndo_open                = br_dev_open,
        .ndo_stop                = br_dev_stop,
        .ndo_init                = br_dev_init,
+       .ndo_uninit              = br_dev_uninit,
        .ndo_start_xmit          = br_dev_xmit,
        .ndo_get_stats64         = br_get_stats64,
        .ndo_set_mac_address     = br_set_mac_address,
@@ -356,14 +366,6 @@ static const struct net_device_ops br_netdev_ops = {
        .ndo_features_check      = passthru_features_check,
 };
 
-static void br_dev_free(struct net_device *dev)
-{
-       struct net_bridge *br = netdev_priv(dev);
-
-       free_percpu(br->stats);
-       free_netdev(dev);
-}
-
 static struct device_type br_type = {
        .name   = "bridge",
 };
@@ -376,7 +378,7 @@ void br_dev_setup(struct net_device *dev)
        ether_setup(dev);
 
        dev->netdev_ops = &br_netdev_ops;
-       dev->destructor = br_dev_free;
+       dev->destructor = free_netdev;
        dev->ethtool_ops = &br_ethtool_ops;
        SET_NETDEV_DEVTYPE(dev, &br_type);
        dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 8ac1770..56a2a72 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -311,7 +311,6 @@ void br_dev_delete(struct net_device *dev, struct list_head 
*head)
 
        br_fdb_delete_by_port(br, NULL, 0, 1);
 
-       br_vlan_flush(br);
        br_multicast_dev_del(br);
        cancel_delayed_work_sync(&br->gc_work);
 
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index b760f26..faa7261 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -2031,8 +2031,6 @@ void br_multicast_dev_del(struct net_bridge *br)
 
 out:
        spin_unlock_bh(&br->multicast_lock);
-
-       free_percpu(br->mcast_stats);
 }
 
 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
@@ -2531,6 +2529,11 @@ int br_multicast_init_stats(struct net_bridge *br)
        return 0;
 }
 
+void br_multicast_uninit_stats(struct net_bridge *br)
+{
+       free_percpu(br->mcast_stats);
+}
+
 static void mcast_stats_add_dir(u64 *dst, u64 *src)
 {
        dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 6136818..0d17728 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -620,6 +620,7 @@ void br_rtr_notify(struct net_device *dev, struct 
net_bridge_port *port,
 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
                        const struct sk_buff *skb, u8 type, u8 dir);
 int br_multicast_init_stats(struct net_bridge *br);
+void br_multicast_uninit_stats(struct net_bridge *br);
 void br_multicast_get_stats(const struct net_bridge *br,
                            const struct net_bridge_port *p,
                            struct br_mcast_stats *dest);
@@ -760,6 +761,10 @@ static inline int br_multicast_init_stats(struct 
net_bridge *br)
        return 0;
 }
 
+static inline void br_multicast_uninit_stats(struct net_bridge *br)
+{
+}
+
 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 {
        return 0;
-- 
2.9.3