net: devinet: Add support for RTM_DELNETCONF
Send RTM_DELNETCONF notifications when a device is deleted. The message only needs the device index, so modify inet_netconf_fill_devconf to skip devconf references if it is NULL. Allows a userspace cache to remove entries as devices are deleted. Signed-off-by: NDavid Ahern <dsa@cumulusnetworks.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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