netdev - Re: [PATCH 1/1] net: socionext: clear rx irq correctly

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Date:   Thu, 11 Oct 2018 12:04:59 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     ilias.apalodimas@...aro.org
Cc:     netdev@...r.kernel.org, jaswinder.singh@...aro.org,
        ard.biesheuvel@...aro.org, masami.hiramatsu@...aro.org
Subject: Re: [PATCH 1/1] net: socionext: clear rx irq correctly

From: Ilias Apalodimas <ilias.apalodimas@...aro.org>
Date: Thu, 11 Oct 2018 15:28:26 +0300

> 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@...aro.org>
> Reported-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>

Applied.