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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: Stefan Hajnoczi <[email protected]> Signed-off-by: Amos Kong <[email protected]> Signed-off-by: David S. Miller <[email protected]>