net: axienet: don't set IRQ timer when IRQ delay not used
When the RX or TX coalesce count is set to 1, there's no point in setting the delay timer value since an interrupt will already be raised on every packet, and the delay interrupt just causes extra pointless interrupts. Signed-off-by: Robert Hancock <robert.hancock@calian.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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