tree a3d7e659ba40da4b3aff973ece4e3b40c38262c6
parent 26450608348e91a782691dbfcc836478f4381071
author Ilias Apalodimas <ilias.apalodimas@linaro.org> 1539260906 +0300
committer David S. Miller <davem@davemloft.net> 1539284648 -0700

net: socionext: clear rx irq correctly

commit 63ae7949e94a ("net: socionext: Use descriptor info instead of MMIO reads on Rx")
removed constant mmio reads from the driver and started using a descriptor
field to check if packet should be processed.
This lead the napi rx handler being constantly called while no packets
needed processing and ksoftirq getting 100% cpu usage. Issue one mmio read
to clear the irq correcty after processing packets

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reported-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>