sfc: save old MAC address in case sriov_mac_address_changed fails
Otherwise the PF and VF can disagree on the VF's MAC address and this leads to strange behaviour, up to and including kernel panics. Signed-off-by: Shradha Shah <sshah@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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