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Code Issues Releases Wiki Activity

macvlan: use the right RCU api

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Make sure we use proper API to fetch dev->rx_handler_data,
instead of ugly casts.

Rename macvlan_port_get() to macvlan_port_get_rtnl() to document fact
that we hold RTNL when needed, with lockdep support.

This removes sparse warnings as well (CONFIG_SPARSE_RCU_POINTER=y)

CHECK   drivers/net/macvlan.c
drivers/net/macvlan.c:706:37: warning: cast removes address space of expression
drivers/net/macvlan.c:775:16: warning: cast removes address space of expression
drivers/net/macvlan.c:924:16: warning: cast removes address space of expression

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2013-03-30 10:08:44 +00:00 committed by David S. Miller
parent 4c3d5e7b41
commit e052f7e64d
1 changed files with 13 additions and 6 deletions
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19
drivers/net/macvlan.c
View file

@ -46,9 +46,16 @@ struct macvlan_port {
static void macvlan_port_destroy(struct net_device *dev);
#define macvlan_port_get_rcu(dev) \
((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
#define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
{
return rcu_dereference(dev->rx_handler_data);
}
static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
{
return rtnl_dereference(dev->rx_handler_data);
}
#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
@ -703,7 +710,7 @@ static int macvlan_port_create(struct net_device *dev)
static void macvlan_port_destroy(struct net_device *dev)
{
struct macvlan_port *port = macvlan_port_get(dev);
struct macvlan_port *port = macvlan_port_get_rtnl(dev);
dev->priv_flags &= ~IFF_MACVLAN_PORT;
netdev_rx_handler_unregister(dev);
@ -772,7 +779,7 @@ int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
if (err < 0)
return err;
}
port = macvlan_port_get(lowerdev);
port = macvlan_port_get_rtnl(lowerdev);
/* Only 1 macvlan device can be created in passthru mode */
if (port->passthru)
@ -921,7 +928,7 @@ static int macvlan_device_event(struct notifier_block *unused,
if (!macvlan_port_exists(dev))
return NOTIFY_DONE;
port = macvlan_port_get(dev);
port = macvlan_port_get_rtnl(dev);
switch (event) {
case NETDEV_CHANGE: