linux-kernel - Re: [alsa-devel] [PATCH v4 07/15] soundwire: slave: move uevent handling to slave

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Date:   Fri, 13 Dec 2019 16:15:56 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     alsa-devel@...a-project.org, tiwai@...e.de,
        linux-kernel@...r.kernel.org,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        vkoul@...nel.org, broonie@...nel.org,
        srinivas.kandagatla@...aro.org, jank@...ence.com,
        slawomir.blauciak@...el.com, Sanyog Kale <sanyog.r.kale@...el.com>,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>
Subject: Re: [alsa-devel] [PATCH v4 07/15] soundwire: slave: move uevent
 handling to slave



On 12/13/19 10:11 AM, Greg KH wrote:
> On Fri, Dec 13, 2019 at 09:11:27AM -0600, Pierre-Louis Bossart wrote:
>> On 12/13/19 1:22 AM, Greg KH wrote:
>>> On Thu, Dec 12, 2019 at 11:04:01PM -0600, Pierre-Louis Bossart wrote:
>>>> Currently the code deals with uevents at the bus level, but we only care
>>>> for Slave events
>>>
>>> What does this mean?  I can't understand it, can you please provide more
>>> information on what you are doing here?
>>
>> In the earlier versions of the patch, the code looks like this and there was
>> an open on what to do with a master-specific event.
>>
>>   static int sdw_uevent(struct device *dev, struct kobj_uevent_env *env)
>>   {
>> +	struct sdw_master_device *md;
>>   	struct sdw_slave *slave;
>>   	char modalias[32];
>>
>> -	if (is_sdw_slave(dev)) {
>> +	if (is_sdw_md(dev)) {
>> +		md = to_sdw_master_device(dev);
>> +		/* TODO: do we need to call add_uevent_var() ? */
>> +	} else 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 {
>>   		dev_warn(dev, "uevent for unknown Soundwire type\n");
>>   		return -EINVAL;
>>   	}
>>
>> Vinod suggested this was not needed and suggested the code for uevents be
>> moved to be slave-specific, which is what this patch does.
> 
> Then describe it really really well in the changelog text.  We have no
> rememberance of prior conversations when looking at commits in the tree
> in the future.

ok, will do.