From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
Mark Brown <broonie@kernel.org>
Cc: Linux-ALSA <alsa-devel@alsa-project.org>
Subject: Re: [PATCH 1/7] ASoC: soc-dai: add mark for snd_soc_dai_startup/shutdown()
Date: Tue, 28 Jul 2020 08:14:21 -0500 [thread overview]
Message-ID: <5d7e4b05-4900-f276-b7d2-ac7c01ad730b@linux.intel.com> (raw)
In-Reply-To: <87v9i8ku04.wl-kuninori.morimoto.gx@renesas.com>
Hi Morimoto-san,
> +#define soc_dai_mark_push(dai, substream, tgt) ((dai)->mark_##tgt = substream)
we may want a check that detects if the pointer is NULL before assigning
it, otherwise we won't be able to detect bad configuration where a
pointer is overwritten by 2 mark_push() calls on the same object?
> +#define soc_dai_mark_pop(dai, substream, tgt) ((dai)->mark_##tgt = NULL)
> +#define soc_dai_mark_match(dai, substream, tgt) ((dai)->mark_##tgt == substream)
> +
> /**
> * snd_soc_dai_set_sysclk - configure DAI system or master clock.
> * @dai: DAI
> @@ -348,15 +356,26 @@ int snd_soc_dai_startup(struct snd_soc_dai *dai,
> dai->driver->ops->startup)
> ret = dai->driver->ops->startup(substream, dai);
>
> + /* mark substream if succeeded */
> + if (ret == 0)
> + soc_dai_mark_push(dai, substream, startup);
> +
I am a bit concerned here about the case of a bi-directional DAI, it's
my understanding that the .startup() callback could be called for each
direction?
soc-dapm.c: ret = snd_soc_dai_startup(source, substream);
soc-dapm.c: ret = snd_soc_dai_startup(sink, substream);
To convince myself of this, I added a dummy startup routine and I do see
it called when I do playback and capture at the same time:
[ 179.057494] plb: ssp2 startup stream 0
[ 183.976963] plb: ssp2 startup stream 1
That makes me nervous about having a single pointer and unbalanced calls
between startup and shutdown.
We had such issues in the past so I may be on the paranoid side here...
Thanks
-Pierre
next prev parent reply other threads:[~2020-07-28 13:15 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-28 6:57 [PATCH 0/7] ASoC: merge soc_pcm_open() rollback and soc_pcm_close() Kuninori Morimoto
2020-07-28 6:57 ` [PATCH 1/7] ASoC: soc-dai: add mark for snd_soc_dai_startup/shutdown() Kuninori Morimoto
2020-07-28 13:14 ` Pierre-Louis Bossart [this message]
2020-07-30 2:16 ` Kuninori Morimoto
2020-07-28 19:27 ` Ranjani Sridharan
2020-07-30 1:31 ` Kuninori Morimoto
2020-07-28 6:57 ` [PATCH 2/7] ASoC: soc-link: add mark for snd_soc_link_startup/shutdown() Kuninori Morimoto
2020-07-28 6:57 ` [PATCH 3/7] ASoC: soc-component: add mark for soc_pcm_components_open/close() Kuninori Morimoto
2020-07-28 6:57 ` [PATCH 4/7] ASoC: soc-component: add mark for snd_soc_pcm_component_pm_runtime_get/put() Kuninori Morimoto
2020-07-28 6:57 ` [PATCH 5/7] ASoC: soc-pcm: add soc_pcm_clean() and call it from soc_pcm_open/close() Kuninori Morimoto
2020-07-28 6:57 ` [PATCH 6/7] ASoC: soc-pcm: remove unneeded dev_err() for snd_soc_dai_startup() Kuninori Morimoto
2020-07-28 6:57 ` [PATCH 7/7] ASoC: soc-pcm: remove unneeded dev_err() for snd_soc_component_module/open() Kuninori Morimoto
2020-09-28 0:00 [PATCH v2 0/7][RESEND] ASoC: merge soc_pcm_open() rollback and soc_pcm_close() Kuninori Morimoto
2020-09-28 0:00 ` [PATCH 1/7] ASoC: soc-dai: add mark for snd_soc_dai_startup/shutdown() Kuninori Morimoto
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