linux-kernel - Re: [PATCH] mfd: arizona: Add sensible return value to some error paths

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Message-ID: <20160831084327.GA27357@dell>
Date:   Wed, 31 Aug 2016 09:43:27 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:     linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com
Subject: Re: [PATCH] mfd: arizona: Add sensible return value to some error
 paths

On Fri, 12 Aug 2016, Charles Keepax wrote:

> There are some cases in arizona_dev_init, such as where we don't
> recognise the chip ID, in which we head to the error path without
> setting a sensible error code in ret. This would lead to the chip
> silently failing probe, as it would still return 0. Fix this up by
> adding appropriate sets of the return value.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
>  drivers/mfd/arizona-core.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index e4f97b3..34a2c26 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -1121,6 +1121,7 @@ int arizona_dev_init(struct arizona *arizona)
>  		break;
>  	default:
>  		dev_err(arizona->dev, "Unknown device ID: %x\n", reg);
> +		ret = -EINVAL;

-EINVAL doesn't seem right here.

-ENODEV perhaps?

>  		goto err_reset;
>  	}
>  
> @@ -1280,12 +1281,14 @@ int arizona_dev_init(struct arizona *arizona)
>  		break;
>  	default:
>  		dev_err(arizona->dev, "Unknown device ID %x\n", reg);
> +		ret = -EINVAL;
>  		goto err_reset;
>  	}
>  
>  	if (!subdevs) {
>  		dev_err(arizona->dev,
>  			"No kernel support for device ID %x\n", reg);
> +		ret = -EINVAL;
>  		goto err_reset;
>  	}
>  

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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