linux-kernel - Re: [PATCH v2] media: uvcvideo: Fix crash during unbind if gpio unit is in use

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Message-ID: <Zyn8dL7mrZ0eSM0w@valkosipuli.retiisi.eu>
Date: Tue, 5 Nov 2024 11:07:32 +0000
From: Sakari Ailus <sakari.ailus@....fi>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCH v2] media: uvcvideo: Fix crash during unbind if gpio unit
 is in use

On Tue, Nov 05, 2024 at 10:53:59AM +0000, Ricardo Ribalda wrote:
> @@ -1329,15 +1329,28 @@ static int uvc_gpio_parse(struct uvc_device *dev)
>  static int uvc_gpio_init_irq(struct uvc_device *dev)
>  {
>  	struct uvc_entity *unit = dev->gpio_unit;
> +	int ret;
>  
>  	if (!unit || unit->gpio.irq < 0)
>  		return 0;
>  
> -	return devm_request_threaded_irq(&dev->udev->dev, unit->gpio.irq, NULL,
> -					 uvc_gpio_irq,
> -					 IRQF_ONESHOT | IRQF_TRIGGER_FALLING |
> -					 IRQF_TRIGGER_RISING,
> -					 "uvc_privacy_gpio", dev);
> +	ret = request_threaded_irq(unit->gpio.irq, NULL, uvc_gpio_irq,
> +				   IRQF_ONESHOT | IRQF_TRIGGER_FALLING |
> +				   IRQF_TRIGGER_RISING,
> +				   "uvc_privacy_gpio", dev);
> +
> +	if (!ret)
> +		dev->gpio_unit->gpio.inited = true;

I missed:

		unit->gpio...;

Or remove unit variable altogether, it's not really needed.

-- 
Sakari Ailus