linux-kernel - Re: [v2 1/9] hwmon: (nct7904) Add error handling in probe function.

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Message-ID: <20190628172932.GA25782@roeck-us.net>
Date:   Fri, 28 Jun 2019 10:29:32 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Amy.Shih@...antech.com.tw
Cc:     she90122@...il.com, oakley.ding@...antech.com.tw,
        jia.sui@...antech.com.cn, Jean Delvare <jdelvare@...e.com>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [v2 1/9] hwmon: (nct7904) Add error handling in probe function.

On Mon, Jun 17, 2019 at 08:08:50AM +0000, Amy.Shih@...antech.com.tw wrote:
> From: "amy.shih" <amy.shih@...antech.com.tw>
> 
> When register read and write operations return errors, needs to add
> error handling.
> 
> Signed-off-by: amy.shih <amy.shih@...antech.com.tw>

Applied.

Thanks,
Guenter

> ---
> Changes in v2:
> - Check for errors on register read and write operations.
> 
>  drivers/hwmon/nct7904.c | 23 ++++++++++++++++++-----
>  1 file changed, 18 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/hwmon/nct7904.c b/drivers/hwmon/nct7904.c
> index 5708171197e7..401ed4a4a576 100644
> --- a/drivers/hwmon/nct7904.c
> +++ b/drivers/hwmon/nct7904.c
> @@ -506,6 +506,8 @@ static int nct7904_probe(struct i2c_client *client,
>  
>  	/* CPU_TEMP attributes */
>  	ret = nct7904_read_reg(data, BANK_0, VT_ADC_CTRL0_REG);
> +	if (ret < 0)
> +		return ret;
>  
>  	if ((ret & 0x6) == 0x6)
>  		data->tcpu_mask |= 1; /* TR1 */
> @@ -518,11 +520,15 @@ static int nct7904_probe(struct i2c_client *client,
>  
>  	/* LTD */
>  	ret = nct7904_read_reg(data, BANK_0, VT_ADC_CTRL2_REG);
> +	if (ret < 0)
> +		return ret;
>  	if ((ret & 0x02) == 0x02)
>  		data->tcpu_mask |= 0x10;
>  
>  	/* Multi-Function detecting for Volt and TR/TD */
>  	ret = nct7904_read_reg(data, BANK_0, VT_ADC_MD_REG);
> +	if (ret < 0)
> +		return ret;
>  
>  	for (i = 0; i < 4; i++) {
>  		val = (ret & (0x03 << i)) >> (i * 2);
> @@ -533,22 +539,29 @@ static int nct7904_probe(struct i2c_client *client,
>  
>  	/* PECI */
>  	ret = nct7904_read_reg(data, BANK_2, PFE_REG);
> +	if (ret < 0)
> +		return ret;
>  	if (ret & 0x80) {
>  		data->enable_dts = 1; //Enable DTS & PECI
>  	} else {
>  		ret = nct7904_read_reg(data, BANK_2, TSI_CTRL_REG);
> +		if (ret < 0)
> +			return ret;
>  		if (ret & 0x80)
>  			data->enable_dts = 0x3; //Enable DTS & TSI
>  	}
>  
>  	/* Check DTS enable status */
>  	if (data->enable_dts) {
> -		data->has_dts =
> -			nct7904_read_reg(data, BANK_0, DTS_T_CTRL0_REG) & 0xF;
> +		ret = nct7904_read_reg(data, BANK_0, DTS_T_CTRL0_REG);
> +		if (ret < 0)
> +			return ret;
> +		data->has_dts = ret & 0xF;
>  		if (data->enable_dts & 0x2) {
> -			data->has_dts |=
> -			(nct7904_read_reg(data, BANK_0, DTS_T_CTRL1_REG) & 0xF)
> -								<< 4;
> +			ret = nct7904_read_reg(data, BANK_0, DTS_T_CTRL1_REG);
> +			if (ret < 0)
> +				return ret;
> +			data->has_dts |= (ret & 0xF) << 4;
>  		}
>  	}
>