ASoC: rt5682: do not block workqueue if card is unbound

[ Upstream commit 4c33de0673ced9c7c37b3bbd9bfe0fda72340b2a ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/soc/codecs/rt5682.c b/sound/soc/codecs/rt5682.c
index 7e6e2f26accd03df5a7c5b406fd9dfd7d6bec155..e3643ae6de66ddcbc1510b1523a4c2d9b08b6c10 100644 (file)
--- a/sound/soc/codecs/rt5682.c
+++ b/sound/soc/codecs/rt5682.c
@@ -1092,11 +1092,13 @@ void rt5682_jack_detect_handler(struct work_struct *work)
        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);