linux-kernel - Re: [PATCH v4 01/11] ASoC: SOF: core: add 'no

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Message-ID: <4d84a799-c07e-e917-7c82-2f24456e3ac2@linux.intel.com>
Date:   Tue, 5 Sep 2023 08:37:24 -0400
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Daniel Baluta <daniel.baluta@....com>,
        linux-kernel@...r.kernel.org, sound-open-firmware@...a-project.org
Subject: Re: [PATCH v4 01/11] ASoC: SOF: core: add 'no_wq' probe and remove
 callbacks



On 9/1/23 08:44, Péter Ujfalusi wrote:
> 
> 
> On 01/09/2023 15:15, Kai Vehmanen wrote:
>> Hi,
>>
>> On Wed, 30 Aug 2023, Maarten Lankhorst wrote:
>>
>>> With the upcoming changes for i915/Xe driver relying on the
>>> -EPROBE_DEFER mechanism, we need to have a first pass of the probe
>>> which cannot be pushed to a workqueue. Introduce 2 new optional
>>> callbacks.
>> [...]
>>> diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c
>>> index 30db685cc5f4b..54c384a5d6140 100644
>>> --- a/sound/soc/sof/core.c
>>> +++ b/sound/soc/sof/core.c
>>> @@ -327,8 +327,6 @@ static int sof_probe_continue(struct snd_sof_dev *sdev)
>>>  dsp_err:
>>>  	snd_sof_remove(sdev);
>>>  probe_err:
>>> -	sof_ops_free(sdev);
>>> -
>>
>> this seems a bit out-of-place in this patch. It seems a valid change,
>> but not really related to this patch, right?
> 
> The ops needs to be preserved even if the wq fails since the patch wants
> to call snd_sof_remove_no_wq() unconditionally on remove.
> 
>> We seem to have a related fix waiting to be sent to alsa-devel, by
>> Peter:
>> "ASoC: SOF: core: Only call sof_ops_free() on remove if the probe wa"
>> https://github.com/thesofproject/linux/pull/4515
> 
> I guess we can revert that in sof-dev, if this is the preferred way?
> 
>> ... not yet in Mark's tree.
>>
>> Otherwise patch looks good to me.
> 
> I would have not created the snd_sof_remove_no_wq() as it makes not much
> functional sense.
> It might be even better if the remove in the wq would do the
> hda_codec_i915_exit() as the module will remain in there until the user
> removes it.

I think find all this very confusing, because there is no workqueue used
in the remove steps. The workqueue is only used ONCE during the probe.