ASoC: rt5668: do not block workqueue if card is unbound
authorKai Vehmanen <kai.vehmanen@linux.intel.com>
Mon, 7 Feb 2022 15:29:59 +0000 (17:29 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 8 Mar 2022 18:12:29 +0000 (19:12 +0100)
commit4235a04ad4018b20d209ae351c7ea90dc0242d90
tree05a51234e5b7fa452809b82e7d8b438a8a14dbc1
parent2ed390555dbc58d96680e990fb722e142ae87c42
ASoC: rt5668: do not block workqueue if card is unbound

[ Upstream commit a6d78661dc903d90a327892bbc34268f3a5f4b9c ]

The current rt5668_jack_detect_handler() assumes the component
and card will always show up and implements an infinite usleep
loop waiting for them to show up.

This does not hold true if a codec interrupt (or other
event) occurs when the card is unbound. The codec driver's
remove  or shutdown functions cannot cancel the workqueue due
to the wait loop. As a result, code can either end up blocking
the workqueue, or hit a kernel oops when the card is freed.

Fix the issue by rescheduling the jack detect handler in
case the card is not ready. In case card never shows up,
the shutdown/remove/suspend calls can now cancel the detect
task.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Shuming Fan <shumingf@realtek.com>
Link: https://lore.kernel.org/r/20220207153000.3452802-2-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
sound/soc/codecs/rt5668.c