95 lines
3 KiB
Diff
95 lines
3 KiB
Diff
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commit fa0879e37b59e8e3f130a30a9e6fa515717c5bdd
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Author: Stefan Hajnoczi <stefanha@gmail.com>
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Date: Mon Jan 21 01:17:22 2013 +0000
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net: split eth_mac_addr for better error handling
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When we set mac address, software mac address in system and hardware mac
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address all need to be updated. Current eth_mac_addr() doesn't allow
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callers to implement error handling nicely.
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This patch split eth_mac_addr() to prepare part and real commit part,
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then we can prepare first, and try to change hardware address, then do
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the real commit if hardware address is set successfully.
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Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
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Signed-off-by: Amos Kong <akong@redhat.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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--- a/include/linux/etherdevice.h
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+++ b/include/linux/etherdevice.h
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@@ -40,6 +40,8 @@ extern int eth_header_cache(const struct
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extern void eth_header_cache_update(struct hh_cache *hh,
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const struct net_device *dev,
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const unsigned char *haddr);
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+extern int eth_prepare_mac_addr_change(struct net_device *dev, void *p);
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+extern void eth_commit_mac_addr_change(struct net_device *dev, void *p);
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extern int eth_mac_addr(struct net_device *dev, void *p);
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extern int eth_change_mtu(struct net_device *dev, int new_mtu);
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extern int eth_validate_addr(struct net_device *dev);
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--- a/net/ethernet/eth.c
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+++ b/net/ethernet/eth.c
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@@ -278,16 +278,11 @@ void eth_header_cache_update(struct hh_c
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EXPORT_SYMBOL(eth_header_cache_update);
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/**
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- * eth_mac_addr - set new Ethernet hardware address
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+ * eth_prepare_mac_addr_change - prepare for mac change
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* @dev: network device
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* @p: socket address
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- *
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- * Change hardware address of device.
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- *
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- * This doesn't change hardware matching, so needs to be overridden
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- * for most real devices.
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*/
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-int eth_mac_addr(struct net_device *dev, void *p)
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+int eth_prepare_mac_addr_change(struct net_device *dev, void *p)
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{
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struct sockaddr *addr = p;
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@@ -295,9 +290,43 @@ int eth_mac_addr(struct net_device *dev,
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return -EBUSY;
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if (!is_valid_ether_addr(addr->sa_data))
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return -EADDRNOTAVAIL;
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+ return 0;
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+}
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+EXPORT_SYMBOL(eth_prepare_mac_addr_change);
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+
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+/**
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+ * eth_commit_mac_addr_change - commit mac change
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+ * @dev: network device
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+ * @p: socket address
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+ */
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+void eth_commit_mac_addr_change(struct net_device *dev, void *p)
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+{
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+ struct sockaddr *addr = p;
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+
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memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
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/* if device marked as NET_ADDR_RANDOM, reset it */
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dev->addr_assign_type &= ~NET_ADDR_RANDOM;
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+}
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+EXPORT_SYMBOL(eth_commit_mac_addr_change);
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+
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+/**
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+ * eth_mac_addr - set new Ethernet hardware address
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+ * @dev: network device
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+ * @p: socket address
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+ *
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+ * Change hardware address of device.
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+ *
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+ * This doesn't change hardware matching, so needs to be overridden
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+ * for most real devices.
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+ */
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+int eth_mac_addr(struct net_device *dev, void *p)
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+{
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+ int ret;
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+
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+ ret = eth_prepare_mac_addr_change(dev, p);
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+ if (ret < 0)
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+ return ret;
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+ eth_commit_mac_addr_change(dev, p);
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return 0;
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}
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EXPORT_SYMBOL(eth_mac_addr);
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