linux-kernel - Re: [PATCH v4 41/45] media: sun6i-csi: Add extra checks to the interrupt routine

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Date:   Wed, 27 Apr 2022 21:57:27 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     Yong Deng <yong.deng@...ewell.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v4 41/45] media: sun6i-csi: Add extra checks to the interrupt routine

Dne petek, 15. april 2022 ob 17:28:07 CEST je Paul Kocialkowski napisal(a):
> Check against the enabled bits and make sure capture is running before
> serving an interrupt, to add extra safety in the process.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

> ---
>  drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c index
> 43b6557b3207..3963a88a2e0b 100644
> --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> @@ -105,13 +105,17 @@ static void sun6i_csi_v4l2_cleanup(struct
> sun6i_csi_device *csi_dev) static irqreturn_t sun6i_csi_interrupt(int irq,
> void *private)
>  {
>  	struct sun6i_csi_device *csi_dev = private;
> +	bool capture_streaming = csi_dev->capture.state.streaming;
>  	struct regmap *regmap = csi_dev->regmap;
> -	u32 status;
> +	u32 status = 0, enable = 0;
> 
>  	regmap_read(regmap, SUN6I_CSI_CH_INT_STA_REG, &status);
> +	regmap_read(regmap, SUN6I_CSI_CH_INT_EN_REG, &enable);
> 
> -	if (!(status & 0xFF))
> +	if (!status)
>  		return IRQ_NONE;
> +	else if (!(status & enable) || !capture_streaming)
> +		goto complete;
> 
>  	if ((status & SUN6I_CSI_CH_INT_STA_FIFO0_OF) ||
>  	    (status & SUN6I_CSI_CH_INT_STA_FIFO1_OF) ||
> @@ -132,6 +136,7 @@ static irqreturn_t sun6i_csi_interrupt(int irq, void
> *private) if (status & SUN6I_CSI_CH_INT_STA_VS)
>  		sun6i_csi_capture_sync(csi_dev);
> 
> +complete:
>  	regmap_write(regmap, SUN6I_CSI_CH_INT_STA_REG, status);
> 
>  	return IRQ_HANDLED;