linux-kernel - Hang up at .prepare( )

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Date:	Tue, 24 Jan 2012 18:38:45 +0900
From:	Tomoya MORINAGA <tomoya.rohm@...il.com>
To:	Liam Girdwood <lrg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	Mike Frysinger <vapier@...too.org>,
	Daniel Mack <zonque@...il.com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Hang up at .prepare( )

Hi

I've started debugging our ASoC drivers.
I've faced issue when installing these drivers,
system becomes hang up at async_synchronize_full_domain() of
dapm_power_widgets()
in .prepare().

Do you have any information about this hang up ?

I show details below.

======Details============

 * Procedure
install codec-driver
install platform-driver
install machine driver

echo ml26124 0x1A > /sys/bus/i2c/devices/i2c-1/new_device
After this command,
occur system hang up within a few seconds

 * Call Trees

platform-driver:.open()
machine-driver:.hw_params()
codec-driver:.hw_params()
platform-driver:.dai_hw_params()
platform-driver:.hw_params()
platform-driver:.prepare()
platform-driver:.dai_digital_mute()
platform-driver:.prepare()
platform-driver:.dai_digital_mute()

platform-driver:.open()
machine-driver:.hw_params()
codec-driver:.hw_params()
platform-driver:.dai_hw_params()
platform-driver:.hw_params()
platform-driver:.prepare()
platform-driver:.dai_digital_mute()
platform-driver:.prepare()
platform-driver:.dai_digital_mute()
platform-driver:.hw_free
platform-driver:.dai_hw_free
platform-driver:.hw_free
platform-driver:.dai_hw_free
platform-driver:.close()

platform-driver:.open()
machine-driver:.hw_params()
codec-driver:.hw_params()
platform-driver:.dai_hw_params()
platform-driver:.hw_params()
platform-driver:.prepare()
platform-driver:.dai_digital_mute()
platform-driver:.prepare()
platform-driver:.dai_digital_mute()
platform-driver:.hw_free
platform-driver:.dai_hw_free
platform-driver:.hw_free
platform-driver:.dai_hw_free
platform-driver:.close()
platform-driver:.hw_free
platform-driver:.dai_hw_free
platform-driver:.hw_free
platform-driver:.dai_hw_free
platform-driver:.close()
platform-driver:.dai_digital_mute()

platform-driver:.open()
machine-driver:.hw_params()
codec-driver:.hw_params()
platform-driver:.dai_hw_params()
platform-driver:.hw_params()
platform-driver:.prepare()
platform-driver:.dai_digital_mute()
platform-driver:.prepare()
platform-driver:.dai_digital_mute()

platform-driver:.open()
machine-driver:.hw_params()
codec-driver:.hw_params()
platform-driver:.dai_hw_params()
platform-driver:.hw_params()
platform-driver:.prepare()
platform-driver:.dai_digital_mute()
platform-driver:.prepare()
platform-driver:.dai_digital_mute()
platform-driver:.hw_free
platform-driver:.dai_hw_free
platform-driver:.hw_free
platform-driver:.dai_hw_free
platform-driver:.close()

platform-driver:.open()
machine-driver:.hw_params()
codec-driver:.hw_params()
platform-driver:.dai_hw_params()
platform-driver:.hw_params()
platform-driver:.prepare()

==> Occur system hang up.

According to system log,
the hang up seems occuring at async_synchronize_full_domain(),
which is at soc_pcm_prepare -> soc_dapm_stream_event ->
dapm_power_widgets -> async_synchronize_full_domain [2nd call]

 * Test condition
CPU=Intel Atom E6xx series
IOH=LAPIS Semiconductor ML7213
Fedora15
Kernel=3.2

thanks in advance.
tomoya
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