IPoIB: Use dev_set_mtu() to change mtu
When the driver sets the MTU of the net device outside of its change_mtu method, it should make use of dev_set_mtu() instead of directly setting the mtu field of struct netdevice. Otherwise functions registered to be called upon MTU change will not get called (this is done through call_netdevice_notifiers() in dev_set_mtu()). Signed-off-by: Eli Cohen <eli@mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
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