linux-kernel - Re: [PATCH 1/1] iio: imx8qxp-adc: fix irq flood when call imx8qxp_adc_read

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Message-ID: <HE1PR0401MB233162590D56093385AC4CF888129@HE1PR0401MB2331.eurprd04.prod.outlook.com>
Date:   Tue, 29 Nov 2022 19:49:54 +0000
From:   Frank Li <frank.li@....com>
To:     Lars-Peter Clausen <lars@...afoo.de>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        Bough Chen <haibo.chen@....com>,
        Jonathan Cameron <jic23@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "open list:NXP i.MX 8QXP ADC DRIVER" <linux-iio@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
CC:     "imx@...ts.linux.dev" <imx@...ts.linux.dev>
Subject: Re: [PATCH 1/1] iio: imx8qxp-adc: fix irq flood when call
 imx8qxp_adc_read_raw()


> On 11/29/22 08:45, Frank Li wrote:
>                        readl(adc->regs + IMX8QXP_ADR_ADC_FCTRL));
> > @@ -272,6 +275,10 @@ static irqreturn_t imx8qxp_adc_isr(int irq, void
> *dev_id)
> >       if (fifo_count)
> >               complete(&adc->completion);
> 
> Shouldn't the completion be triggered after the reading of the samples?
> otherwise you have a race condition on a multi-processor system.

Yes, you are right. I will send updated patch soon.

> 
> >
> > +     for (i = 0; i < fifo_count; i++)
> > +             adc->fifo[i] = FIELD_GET(IMX8QXP_ADC_RESFIFO_VAL_MASK,
> > +                             readl_relaxed(adc->regs + IMX8QXP_ADR_ADC_RESFIFO));
> > +
> >       return IRQ_HANDLED;
> >   }
> >