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Sender: Guenter Roeck <groeck7@gmail.com>
Date:   Thu, 18 Aug 2022 12:40:08 -0700
From:   Guenter Roeck <linux@roeck-us.net>
To:     Eliav Farber <farbere@amazon.com>
Cc:     jdelvare@suse.com, robh+dt@kernel.org, mark.rutland@arm.com,
        linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, talel@amazon.com, hhhawa@amazon.com,
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        amitlavi@amazon.com, almogbs@amazon.com, dwmw@amazon.co.uk,
        rtanwar@maxlinear.com
Subject: Re: [PATCH v2 01/16] hwmon: (mr75203) fix VM sensor allocation when
 "intel,vm-map" not defined
Message-ID: <20220818194008.GA3118944@roeck-us.net>
References: <20220817054321.6519-1-farbere@amazon.com>
 <20220817054321.6519-2-farbere@amazon.com>
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On Wed, Aug 17, 2022 at 05:43:06AM +0000, Eliav Farber wrote:
> Fix a bug that in case "intel,vm-map" is missing 'num' is set to 0,
> and no voltage channel infos are allocated.
> 

"intel,vm-map" is listed as required property in moortec,mr75203.yaml.
If it is missing, the probe function should fail.

Guenter

> Signed-off-by: Eliav Farber <farbere@amazon.com>
> ---
>  drivers/hwmon/mr75203.c | 28 ++++++++++++----------------
>  1 file changed, 12 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
> index 046523d47c29..0e29877a1a9c 100644
> --- a/drivers/hwmon/mr75203.c
> +++ b/drivers/hwmon/mr75203.c
> @@ -580,8 +580,6 @@ static int mr75203_probe(struct platform_device *pdev)
>  	}
>  
>  	if (vm_num) {
> -		u32 num = vm_num;
> -
>  		ret = pvt_get_regmap(pdev, "vm", pvt);
>  		if (ret)
>  			return ret;
> @@ -594,30 +592,28 @@ static int mr75203_probe(struct platform_device *pdev)
>  		ret = device_property_read_u8_array(dev, "intel,vm-map",
>  						    pvt->vm_idx, vm_num);
>  		if (ret) {
> -			num = 0;
> +			/*
> +			 * Incase intel,vm-map property is not defined, we
> +			 * assume incremental channel numbers.
> +			 */
> +			for (i = 0; i < vm_num; i++)
> +				pvt->vm_idx[i] = i;
>  		} else {
>  			for (i = 0; i < vm_num; i++)
>  				if (pvt->vm_idx[i] >= vm_num ||
> -				    pvt->vm_idx[i] == 0xff) {
> -					num = i;
> +				    pvt->vm_idx[i] == 0xff)
>  					break;
> -				}
> -		}
>  
> -		/*
> -		 * Incase intel,vm-map property is not defined, we assume
> -		 * incremental channel numbers.
> -		 */
> -		for (i = num; i < vm_num; i++)
> -			pvt->vm_idx[i] = i;
> +			vm_num = i;
> +		}
>  
> -		in_config = devm_kcalloc(dev, num + 1,
> +		in_config = devm_kcalloc(dev, vm_num + 1,
>  					 sizeof(*in_config), GFP_KERNEL);
>  		if (!in_config)
>  			return -ENOMEM;
>  
> -		memset32(in_config, HWMON_I_INPUT, num);
> -		in_config[num] = 0;
> +		memset32(in_config, HWMON_I_INPUT, vm_num);
> +		in_config[vm_num] = 0;
>  		pvt_in.config = in_config;
>  
>  		pvt_info[index++] = &pvt_in;