[alsa-devel] [PATCH v5 06/17] soundwire: add support for sdw_slave_type

[Pierre-Louis Bossart]

>>   static int sdw_uevent(struct device *dev, struct kobj_uevent_env *env)
>>   {
>> -	struct sdw_slave *slave = to_sdw_slave_device(dev);
>> +	struct sdw_slave *slave;
>>   	char modalias[32];
>>   
>> -	sdw_slave_modalias(slave, modalias, sizeof(modalias));
>> -
>> -	if (add_uevent_var(env, "MODALIAS=%s", modalias))
>> -		return -ENOMEM;
>> +	if (is_sdw_slave(dev)) {
>> +		slave = to_sdw_slave_device(dev);
>> +
>> +		sdw_slave_modalias(slave, modalias, sizeof(modalias));
>> +
>> +		if (add_uevent_var(env, "MODALIAS=%s", modalias))
>> +			return -ENOMEM;
>> +	} else {
>> +		/*
>> +		 * We only need to handle uevents for the Slave device
>> +		 * type. This error cannot happen unless the .uevent
>> +		 * callback is set to use this function for a
>> +		 * different device type (e.g. Master or Monitor)
>> +		 */
>> +		dev_err(dev, "uevent for unknown Soundwire type\n");
>> +		return -EINVAL;
> 
> At this point and after next patch, the above code would be a no-op, do
> we want this here, if so why?

to be future proof if someone wants to add support for a monitor, as 
explained above.
I can remove this if you don't want it.