From 4c33de0673ced9c7c37b3bbd9bfe0fda72340b2a Mon Sep 17 00:00:00 2001
From: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Date: Mon, 7 Feb 2022 17:30:00 +0200
Subject: [PATCH] ASoC: rt5682: do not block workqueue if card is unbound
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Git-commit: 4c33de0673ced9c7c37b3bbd9bfe0fda72340b2a
Patch-mainline: v5.17-rc5
References: git-fixes

The current rt5682_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/20220207153000.3452802-3-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/codecs/rt5682.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

--- a/sound/soc/codecs/rt5682.c
+++ b/sound/soc/codecs/rt5682.c
@@ -1092,11 +1092,13 @@ void rt5682_jack_detect_handler(struct w
 	struct snd_soc_dapm_context *dapm;
 	int val, btn_type;
 
-	while (!rt5682->component)
-		usleep_range(10000, 15000);
-
-	while (!rt5682->component->card->instantiated)
-		usleep_range(10000, 15000);
+	if (!rt5682->component || !rt5682->component->card ||
+	    !rt5682->component->card->instantiated) {
+		/* card not yet ready, try later */
+		mod_delayed_work(system_power_efficient_wq,
+				 &rt5682->jack_detect_work, msecs_to_jiffies(15));
+		return;
+	}
 
 	dapm = snd_soc_component_get_dapm(rt5682->component);