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Message-ID: <alpine.DEB.2.22.394.2309011516110.3532114@eliteleevi.tm.intel.com>
Date: Fri, 1 Sep 2023 15:22:50 +0300 (EEST)
From: Kai Vehmanen <kai.vehmanen@...ux.intel.com>
To: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
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>,
Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
Bard Liao <yung-chuan.liao@...ux.intel.com>,
Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
Kai Vehmanen <kai.vehmanen@...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
Hi,
On Wed, 30 Aug 2023, Pierre-Louis Bossart wrote:
> > /* probe/remove/shutdown */
> > + int (*probe_no_wq)(struct snd_sof_dev *sof_dev); /* optional */
> > + int (*remove_no_wq)(struct snd_sof_dev *sof_dev); /* optional */
>
> My initial PR didn't have this remove_no_wq() callback.
>
> For symmetry it could be useful if it is meant to undo what the
> probe_no_wq() did, but conceptually the first thing we do in the remove
> is make sure that workqueue is either not scheduled or we wait until it
> completes.
I think that's exactly what the patch ends up with, remove_no_wq releases
resources acquired in probe_no_wq, i.e. they are symmetrical.
> int snd_sof_device_remove(struct device *dev)
> {
> struct snd_sof_dev *sdev = dev_get_drvdata(dev);
> struct snd_sof_pdata *pdata = sdev->pdata;
> int ret;
>
> if (IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE))
> cancel_work_sync(&sdev->probe_work);
So this seems ok as well:
- if wq is used, at remove, we first wait wq to be finished
and only then proceed with removal
- the remove_no_wq is run only when the first step is completed
Br, Kai
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