linux-kernel - Re: [PATCH v4 03/14] soc: mediatek: mtk-svs: enable the IRQ later

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Message-ID: <561d9a97-64c7-6633-ff10-d85ae2c7f314@gmail.com>
Date:   Tue, 31 Jan 2023 13:59:35 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Roger Lu <roger.lu@...iatek.com>,
        Enric Balletbo Serra <eballetbo@...il.com>,
        Kevin Hilman <khilman@...nel.org>,
        Nicolas Boichat <drinkcat@...gle.com>
Cc:     Fan Chen <fan.chen@...iatek.com>,
        Jia-wei Chang <jia-wei.chang@...iatek.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Ricardo Ribalda <ribalda@...omium.org>
Subject: Re: [PATCH v4 03/14] soc: mediatek: mtk-svs: enable the IRQ later



On 11/01/2023 08:45, Roger Lu wrote:
> From: Ricardo Ribalda <ribalda@...omium.org>
> 
> If the system does not come from reset (like when is booted via
> kexec(), the peripheral might trigger an IRQ before the data structures
> are initialized.
> 
> Fixes:
> 
> [    0.227710] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000f08
> [    0.227913] Call trace:
> [    0.227918]  svs_isr+0x8c/0x538
> 

This patch is different from
https://lore.kernel.org/r/20221127-mtk-svs-v2-0-145b07663ea8@chromium.org

If you think the patch from Ricardo is wrong, then you should have mentioned 
that in the review.

Regards,
Matthias

> Fixes: 681a02e95000 ("soc: mediatek: SVS: introduce MTK SVS engine")
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> Signed-off-by: Roger Lu <roger.lu@...iatek.com>
> ---
>   drivers/soc/mediatek/mtk-svs.c | 28 ++++++++++++++--------------
>   1 file changed, 14 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-svs.c b/drivers/soc/mediatek/mtk-svs.c
> index a803b92afc3d..64d4d03ab71c 100644
> --- a/drivers/soc/mediatek/mtk-svs.c
> +++ b/drivers/soc/mediatek/mtk-svs.c
> @@ -2403,20 +2403,6 @@ static int svs_probe(struct platform_device *pdev)
>   		goto svs_probe_free_resource;
>   	}
>   
> -	svsp_irq = platform_get_irq(pdev, 0);
> -	if (svsp_irq < 0) {
> -		ret = svsp_irq;
> -		goto svs_probe_free_resource;
> -	}
> -
> -	ret = devm_request_threaded_irq(svsp->dev, svsp_irq, NULL, svs_isr,
> -					IRQF_ONESHOT, svsp->name, svsp);
> -	if (ret) {
> -		dev_err(svsp->dev, "register irq(%d) failed: %d\n",
> -			svsp_irq, ret);
> -		goto svs_probe_free_resource;
> -	}
> -
>   	svsp->main_clk = devm_clk_get(svsp->dev, "main");
>   	if (IS_ERR(svsp->main_clk)) {
>   		dev_err(svsp->dev, "failed to get clock: %ld\n",
> @@ -2438,6 +2424,20 @@ static int svs_probe(struct platform_device *pdev)
>   		goto svs_probe_clk_disable;
>   	}
>   
> +	svsp_irq = platform_get_irq(pdev, 0);
> +	if (svsp_irq < 0) {
> +		ret = svsp_irq;
> +		goto svs_probe_iounmap;
> +	}
> +
> +	ret = devm_request_threaded_irq(svsp->dev, svsp_irq, NULL, svs_isr,
> +					IRQF_ONESHOT, svsp->name, svsp);
> +	if (ret) {
> +		dev_err(svsp->dev, "register irq(%d) failed: %d\n",
> +			svsp_irq, ret);
> +		goto svs_probe_iounmap;
> +	}
> +
>   	ret = svs_start(svsp);
>   	if (ret) {
>   		dev_err(svsp->dev, "svs start fail: %d\n", ret);