linux-kernel - Re: [PATCHv3] media: venus: protect against spurious interrupts during probe

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Message-ID: <3035fc55-f422-d0d7-8889-48530dd0748e@quicinc.com>
Date: Thu, 19 Jun 2025 23:44:29 +0530
From: Dikshita Agarwal <quic_dikshita@...cinc.com>
To: Jorge Ramirez-Ortiz <jorge.ramirez@....qualcomm.com>,
        <quic_vgarodia@...cinc.com>, <bryan.odonoghue@...aro.org>,
        <mchehab@...nel.org>
CC: <hans.verkuil@...co.com>, <stanimir.varbanov@...aro.org>,
        <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3] media: venus: protect against spurious interrupts
 during probe



On 6/6/2025 8:55 PM, Jorge Ramirez-Ortiz wrote:
> Make sure the interrupt handler is initialized before the interrupt is
> registered.
> 
> If the IRQ is registered before hfi_create(), it's possible that an
> interrupt fires before the handler setup is complete, leading to a NULL
> dereference.
> 
> This error condition has been observed during system boot on Rb3Gen2.
> 
> Fixes: af2c3834c8ca ("[media] media: venus: adding core part and helper functions")
> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez@....qualcomm.com>
> ---
>  v3:
>     Added Fixes tag
>  v2:
>     Fix authorship
>     Fix spelling mistake
>  
>  drivers/media/platform/qcom/venus/core.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
> index d305d74bb152..5bd99d0aafe4 100644
> --- a/drivers/media/platform/qcom/venus/core.c
> +++ b/drivers/media/platform/qcom/venus/core.c
> @@ -424,13 +424,13 @@ static int venus_probe(struct platform_device *pdev)
>  	INIT_DELAYED_WORK(&core->work, venus_sys_error_handler);
>  	init_waitqueue_head(&core->sys_err_done);
>  
> -	ret = devm_request_threaded_irq(dev, core->irq, hfi_isr, venus_isr_thread,
> -					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
> -					"venus", core);
> +	ret = hfi_create(core, &venus_core_ops);
>  	if (ret)
>  		goto err_core_put;
>  
> -	ret = hfi_create(core, &venus_core_ops);
> +	ret = devm_request_threaded_irq(dev, core->irq, hfi_isr, venus_isr_thread,
> +					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
> +					"venus", core);
>  	if (ret)
>  		goto err_core_put;
>  
Reviewed-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
Tested-by: Dikshita Agarwal <quic_dikshita@...cinc.com> # RB5