linux-kernel - Re: [PATCH 1/3] media: bcm2835-unicam: Fix error handling for platform_get

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Message-ID: <20240506180019.GE29108@pendragon.ideasonboard.com>
Date: Mon, 6 May 2024 21:00:19 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
	linux-media@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Hans Verkuil <hverkuil@...all.nl>
Subject: Re: [PATCH 1/3] media: bcm2835-unicam: Fix error handling for
 platform_get_irq

Hi Ricardo,

Thank you for the patch.

On Tue, Apr 30, 2024 at 07:51:26AM +0000, Ricardo Ribalda wrote:
> platform_get_irq() cannot return the value 0.
> 
> If it returns -EPROBE_DEFER, we need to populate the error code upwards
> to retry probing once the irq handler is ready.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  drivers/media/platform/broadcom/bcm2835-unicam.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/broadcom/bcm2835-unicam.c b/drivers/media/platform/broadcom/bcm2835-unicam.c
> index bd2bbb53070e..2a3a27ac70ba 100644
> --- a/drivers/media/platform/broadcom/bcm2835-unicam.c
> +++ b/drivers/media/platform/broadcom/bcm2835-unicam.c
> @@ -2660,9 +2660,10 @@ static int unicam_probe(struct platform_device *pdev)
>  	}
>  
>  	ret = platform_get_irq(pdev, 0);
> -	if (ret <= 0) {
> +	if (ret < 0) {
>  		dev_err(&pdev->dev, "No IRQ resource\n");
> -		ret = -EINVAL;
> +		if (ret != -EPROBE_DEFER)
> +			ret = -EINVAL;

What's wrong with leaving ret untouched ? I assume it was set to -EINVAL
to avoid returning success in case ret was 0. Now that the test has
changed, I think we can leave the value as-is.

>  		goto err_unicam_put;
>  	}
>  
> 

-- 
Regards,

Laurent Pinchart