batman-adv: Trigger events for auto adjusted MTU
If an interface changes the MTU, it is expected that an NETDEV_PRECHANGEMTU and NETDEV_CHANGEMTU notification events is triggered. This worked fine for .ndo_change_mtu based changes because core networking code took care of it. But for auto-adjustments after hard-interfaces changes, these events were simply missing. Due to this problem, non-batman-adv components weren't aware of MTU changes and thus couldn't perform their own tasks correctly. Fixes: c6c8fea2 ("net: Add batman-adv meshing protocol") Cc: stable@vger.kernel.org Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
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