korina: rework korina_rx() for use with napi
This function needs an early exit condition to function properly, or else caller assumes napi workload wasn't enough to handle all received packets and korina_rx is called again (and again and again and ...). Signed-off-by: NPhil Sutter <n0-1@freewrt.org> Acked-by: NFlorian Fainelli <florian@openwrt.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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