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Subject: Re: [alsa-devel] [RFC PATCH 37/40] soundwire: cadence_master: add
 hw_reset capability in debugfs
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     alsa-devel@alsa-project.org, tiwai@suse.de,
        linux-kernel@vger.kernel.org, vkoul@kernel.org, broonie@kernel.org,
        srinivas.kandagatla@linaro.org, jank@cadence.com,
        slawomir.blauciak@intel.com, Sanyog Kale <sanyog.r.kale@intel.com>
References: <20190725234032.21152-1-pierre-louis.bossart@linux.intel.com>
 <20190725234032.21152-38-pierre-louis.bossart@linux.intel.com>
 <20190726140749.GC8767@kroah.com>
From:   Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Message-ID: <81637203-4a8d-5d6b-26c8-524b8868b015@linux.intel.com>
Date:   Fri, 26 Jul 2019 10:01:54 -0500
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Thanks for the review Greg.

>> +static int cdns_hw_reset(void *data, u64 value)
>> +{
>> +	struct sdw_cdns *cdns = data;
>> +	int ret;
>> +
>> +	if (value != 1)
>> +		return 0;
>> +
>> +	dev_info(cdns->dev, "starting link hw_reset\n");
>> +
>> +	ret = sdw_cdns_exit_reset(cdns);
>> +
>> +	dev_info(cdns->dev, "link hw_reset done\n");
> 
> Do not be noisy for when things always go right.  This looks like
> debuggging code, please remove.

yes, missed this in the cleanup, will remove.

>> +DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
>> +
>>   /**
>>    * sdw_cdns_debugfs_init() - Cadence debugfs init
>>    * @cdns: Cadence instance
>> @@ -339,6 +358,9 @@ static const struct file_operations cdns_reg_fops = {
>>   void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
>>   {
>>   	debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
>> +
>> +	debugfs_create_file_unsafe("cdns-hw-reset", 0200, root, cdns,
>> +				   &cdns_hw_reset_fops);
> 
> Why unsafe?

Dunno. I followed the documentation and my take-away, along with a 
number of examples, was to use _unsafe. I really have no idea if this is 
correct or not, I can remove this qualifier if that's not needed.