linux-kernel - Re: [alsa-devel] [RFC PATCH 04/40] soundwire: intel: add debugfs register dump

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Message-ID: <d231f6b0-555a-8c45-1a9a-215c73171923@linux.intel.com>
Date:   Fri, 26 Jul 2019 09:00:28 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Cezary Rojewski <cezary.rojewski@...el.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, vkoul@...nel.org,
        gregkh@...uxfoundation.org, jank@...ence.com,
        srinivas.kandagatla@...aro.org, slawomir.blauciak@...el.com,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [alsa-devel] [RFC PATCH 04/40] soundwire: intel: add debugfs
 register dump



On 7/26/19 4:35 AM, Cezary Rojewski wrote:
> On 2019-07-26 01:39, Pierre-Louis Bossart wrote:
>> +static void intel_debugfs_init(struct sdw_intel *sdw)
>> +{
>> +    struct dentry *root = sdw->cdns.bus.debugfs;
>> +
>> +    if (!root)
>> +        return;
>> +
>> +    sdw->fs = debugfs_create_dir("intel-sdw", root);
>> +    if (IS_ERR_OR_NULL(sdw->fs)) {
>> +        dev_err(sdw->cdns.dev, "debugfs root creation failed\n");
>> +        sdw->fs = NULL;
>> +        return;
>> +    }
>> +
>> +    debugfs_create_file("intel-registers", 0400, sdw->fs, sdw,
>> +                &intel_reg_fops);
>> +
>> +    sdw_cdns_debugfs_init(&sdw->cdns, sdw->fs);
>> +}
> 
> I believe there should be dummy equivalent of _init and _exit if debugfs 
> is not enabled (if these are defined already and I've missed it, please 
> ignore).

I think the direction is just to keep going if there is an error or 
debufs is not enabled.

> 
>> +static void intel_debugfs_exit(struct sdw_intel *sdw)
>> +{
>> +    debugfs_remove_recursive(sdw->fs);
>> +}