Commit fa0879e3 authored by Stefan Hajnoczi's avatar Stefan Hajnoczi Committed by David S. Miller

net: split eth_mac_addr for better error handling

When we set mac address, software mac address in system and hardware mac
address all need to be updated. Current eth_mac_addr() doesn't allow
callers to implement error handling nicely.

This patch split eth_mac_addr() to prepare part and real commit part,
then we can prepare first, and try to change hardware address, then do
the real commit if hardware address is set successfully.
Signed-off-by: default avatarStefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: default avatarAmos Kong <akong@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 40cbfc37
......@@ -40,6 +40,8 @@ extern int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh,
extern void eth_header_cache_update(struct hh_cache *hh,
const struct net_device *dev,
const unsigned char *haddr);
extern int eth_prepare_mac_addr_change(struct net_device *dev, void *p);
extern void eth_commit_mac_addr_change(struct net_device *dev, void *p);
extern int eth_mac_addr(struct net_device *dev, void *p);
extern int eth_change_mtu(struct net_device *dev, int new_mtu);
extern int eth_validate_addr(struct net_device *dev);
......
......@@ -271,6 +271,36 @@ void eth_header_cache_update(struct hh_cache *hh,
}
EXPORT_SYMBOL(eth_header_cache_update);
/**
* eth_prepare_mac_addr_change - prepare for mac change
* @dev: network device
* @p: socket address
*/
int eth_prepare_mac_addr_change(struct net_device *dev, void *p)
{
struct sockaddr *addr = p;
if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
return -EBUSY;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
return 0;
}
EXPORT_SYMBOL(eth_prepare_mac_addr_change);
/**
* eth_commit_mac_addr_change - commit mac change
* @dev: network device
* @p: socket address
*/
void eth_commit_mac_addr_change(struct net_device *dev, void *p)
{
struct sockaddr *addr = p;
memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
}
EXPORT_SYMBOL(eth_commit_mac_addr_change);
/**
* eth_mac_addr - set new Ethernet hardware address
* @dev: network device
......@@ -283,13 +313,12 @@ EXPORT_SYMBOL(eth_header_cache_update);
*/
int eth_mac_addr(struct net_device *dev, void *p)
{
struct sockaddr *addr = p;
int ret;
if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
return -EBUSY;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
ret = eth_prepare_mac_addr_change(dev, p);
if (ret < 0)
return ret;
eth_commit_mac_addr_change(dev, p);
return 0;
}
EXPORT_SYMBOL(eth_mac_addr);
......
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