batman-adv: Request iflink once in batadv_get_real_netdevice
There is no need to call dev_get_iflink multiple times for the same net_device in batadv_get_real_netdevice. And since some of the ndo_get_iflink callbacks are dynamic (for example via RCUs like in vxcan_get_iflink), it could easily happen that the returned values are not stable. The pre-checks before __dev_get_by_index are then of course bogus. Fixes: 5ed4a460 ("batman-adv: additional checks for virtual interfaces on top of WiFi") Signed-off-by:Sven Eckelmann <sven@narfation.org> Signed-off-by:
Simon Wunderlich <sw@simonwunderlich.de>
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690bb6fb