Re: [PATCH 1/3] i2c-cht-wc: Add locking to interrupt / smbus_xfer functions

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Mon, 2017-08-14 at 22:17 +0200, Hans de Goede wrote:
> Although unlikely without locking the smbux_xfer function may miss
> the nack flag and further fixes in this patch-set add some more
> complex constructions which need protection.
 
> -	if (read_write == I2C_SMBUS_READ) {
> +	ret = 0;
> +	mutex_lock(&adap->adap_lock);
> +	if (adap->nack)
> +		ret = -EIO;
> +	else if (read_write == I2C_SMBUS_READ) {
>  		ret = regmap_read(adap->regmap, CHT_WC_I2C_RDDATA,
> &reg);
> -		if (ret)
> -			return ret;
> -

>  		data->byte = reg;

Can this be moved out to keep logic the same (don't dirt data on error)?

>  	}
> +	mutex_unlock(&adap->adap_lock);
>  
> -	return 0;
> +	return ret;

-- 
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy