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a card is ejected). wpa_supplicant requires that internal events for interfaces coming+going include a name but after an interface is removed you cannot use if_indextoname to map the interface index in the RTM_IFINFO (or RTM_IFANNOUNCE) msg to an interface name. Instead record the interface index in the driver-private data area and use that to filter msgs from the routing socket. This insures that when we have a message to process we know the interface name. The end result is that we can now dispatch an "interface removed" event that is understood when notified than an interface went away (where previously the event dispatched was ignored because the interface name was unrecognized). This change also insures we only process events for our interface. The only downside is that we can no longer wait for an interface to arrive as we need to map the interface name to an index at startup. This is not important as wpa_supplicant should be launched by devd and not include a separate mechanism for doing interface discovery. MFC after: 3 days
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