ravb: implement MTU change while device is up
Pre-allocates buffers sufficient for the maximum supported MTU (2026) in order to eliminate the possibility of resource exhaustion when changing the MTU while the device is up. Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu> Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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