linux-kernel - Re: [PATCH v2] soc: mediatek: mtk-svs: Enable the IRQ later

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Message-ID: <12f4d25e-fb2e-8f4d-1874-46f7404b05b6@gmail.com>
Date:   Wed, 21 Dec 2022 09:56:53 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Ricardo Ribalda <ribalda@...omium.org>,
        Roger Lu <Roger.Lu@...iatek.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] soc: mediatek: mtk-svs: Enable the IRQ later



On 20/12/2022 22:35, Ricardo Ribalda wrote:
> If the system does not come from reset (like when is booted via
> kexec()), the peripheral might triger an IRQ before the data structures
> are initialised.
> 
> Fixes:
> 
> [    0.227710] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000f08
> [    0.227913] Call trace:
> [    0.227918]  svs_isr+0x8c/0x538
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>

Thanks Ricardo. Roger I'll wait for a Tested-by tag from you to make sure this 
time everything is fine.

Regards,
Matthias

> ---
> To: Matthias Brugger <matthias.bgg@...il.com>
> To: Roger Lu <Roger.Lu@...iatek.com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-mediatek@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
> Changes in v2:
> - Enable the irq before svs_start, to avoid MT8192 not starting.
> - Link to v1: https://lore.kernel.org/r/20221127-mtk-svs-v1-0-7a5819595838@chromium.org
> ---
>   drivers/soc/mediatek/mtk-svs.c | 16 ++++++++--------
>   1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-svs.c b/drivers/soc/mediatek/mtk-svs.c
> index 0469c9dfeb04..75b2f534aa9d 100644
> --- a/drivers/soc/mediatek/mtk-svs.c
> +++ b/drivers/soc/mediatek/mtk-svs.c
> @@ -2385,14 +2385,6 @@ static int svs_probe(struct platform_device *pdev)
>   		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",
> @@ -2414,6 +2406,14 @@ static int svs_probe(struct platform_device *pdev)
>   		goto svs_probe_clk_disable;
>   	}
>   
> +	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);
> 
> ---
> base-commit: 4312098baf37ee17a8350725e6e0d0e8590252d4
> change-id: 20221127-mtk-svs-add137fbf187
> 
> Best regards,