r6040: save and restore MIER correctly in the interrupt routine
This patch saves the MIER register contents before treating interrupts, then restores them correcty at the end of the interrupt routine. Signed-off-by: NJoe Chou <Joe.Chou@rdc.com.tw> Signed-off-by: NFlorian Fainelli <florian@openwrt.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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