linux-kernel - Re: [PATCH] Avoid needless loop in sdhci

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Message-ID: <CAA+hA=StthxfMWjQ+0fhdRiPuDDVWUGrrW9E71Q+E3RoF_QdHw@mail.gmail.com>
Date:	Wed, 6 Nov 2013 10:56:27 +0800
From:	Dong Aisheng <dongas86@...il.com>
To:	Alexey Neyman <stilor@....net>
Cc:	Chris Ball <cjb@...top.org>,
	"open list:SECURE DIGITAL HO..." <linux-mmc@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Avoid needless loop in sdhci_irq()

On Wed, Nov 6, 2013 at 3:58 AM, Alexey Neyman <stilor@....net> wrote:
> Ignore Card Interrupt bit in the interrupt status if we already know that
> mmc_signal_sdio_irq() is going to be called at the end of sdhci_irq(). This
> avoids a needless loop in sdhci_irq() repeatedly reading interrupt status
> and doing nothing.
>
> Signed-off-by: Alexey Neyman <stilor@....net>

You need improve the patch title a bit, like:
mmc: sdhci: avoid needless loop for handle SDIO interrupts in sdhci_irq

Otherwise,
Acked-by: Dong Aisheng <b29396@...escale.com>

You could resend with my ack.

Regards
Dong Aisheng

> ---
>  drivers/mmc/host/sdhci.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 7a7fb4f..a83cd1b 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2491,6 +2491,14 @@ again:
>         result = IRQ_HANDLED;
>
>         intmask = sdhci_readl(host, SDHCI_INT_STATUS);
> +
> +       /*
> +        * If we know we'll call the driver to signal SDIO IRQ, disregard
> +        * further indications of Card Interrupt in the status to avoid a
> +        * needless loop.
> +        */
> +       if (cardint)
> +               intmask &= ~SDHCI_INT_CARD_INT;
>         if (intmask && --max_loops)
>                 goto again;
>  out:
> --
> 1.8.4.1
>
> --
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