linux-kernel - [PATCH] ASoC: da7219: Initialize jack_det

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Message-Id: <20230307155111.1985522-1-linux@roeck-us.net>
Date:   Tue,  7 Mar 2023 07:51:11 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Support Opensource <support.opensource@...semi.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        David Rau <David.Rau.opensource@...renesas.com>
Subject: [PATCH] ASoC: da7219: Initialize jack_det_mutex

The following traceback is reported if mutex debugging is enabled.

DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 0 PID: 17 at kernel/locking/mutex.c:950 __mutex_lock_common+0x31c/0x11d4
Modules linked in:
CPU: 0 PID: 17 Comm: kworker/0:1 Not tainted 5.10.172-lockdep-21846-g849884cfca5a #1 fd2de466502012eb58bc8beb467f07d0b925611f
Hardware name: MediaTek kakadu rev0/rev1 board (DT)
Workqueue: events da7219_aad_jack_det_work
pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)
pc : __mutex_lock_common+0x31c/0x11d4
lr : __mutex_lock_common+0x31c/0x11d4
sp : ffffff80c0317ae0
x29: ffffff80c0317b50 x28: ffffff80c0317b20
x27: 0000000000000000 x26: 0000000000000000
x25: 0000000000000000 x24: 0000000100000000
x23: ffffffd0121d296c x22: dfffffd000000000
x21: 0000000000000000 x20: 0000000000000000
x19: ffffff80c73d7190 x18: 1ffffff018050f52
x17: 0000000000000000 x16: 0000000000000000
x15: 0000000000000000 x14: 0000000000000000
x13: 0000000000000001 x12: 0000000000000001
x11: 0000000000000000 x10: 0000000000000000
x9 : 83f0d991da544b00 x8 : 83f0d991da544b00
x7 : 0000000000000000 x6 : 0000000000000001
x5 : ffffff80c03176a0 x4 : 0000000000000000
x3 : ffffffd01067fd78 x2 : 0000000100000000
x1 : ffffff80c030ba80 x0 : 0000000000000028
Call trace:
__mutex_lock_common+0x31c/0x11d4
mutex_lock_nested+0x98/0xac
da7219_aad_jack_det_work+0x54/0xf0
process_one_work+0x6cc/0x19dc
worker_thread+0x458/0xddc
kthread+0x2fc/0x370
ret_from_fork+0x10/0x30
irq event stamp: 579
hardirqs last enabled at (579): [<ffffffd012442b30>] exit_to_kernel_mode+0x108/0x138
hardirqs last disabled at (577): [<ffffffd010001144>] __do_softirq+0x53c/0x125c
softirqs last enabled at (578): [<ffffffd01009995c>] __irq_exit_rcu+0x264/0x4f4
softirqs last disabled at (573): [<ffffffd01009995c>] __irq_exit_rcu+0x264/0x4f4
---[ end trace 26da674636181c40 ]---

Initialize the mutex to fix the problem.

Cc: David Rau <David.Rau.opensource@...renesas.com>
Fixes: 7fde88eda855 ("ASoC: da7219: Improve the IRQ process to increase the stability")
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 sound/soc/codecs/da7219-aad.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/codecs/da7219-aad.c b/sound/soc/codecs/da7219-aad.c
index 4a4f09f924bc..e3d398b8f54e 100644
--- a/sound/soc/codecs/da7219-aad.c
+++ b/sound/soc/codecs/da7219-aad.c
@@ -968,6 +968,8 @@ int da7219_aad_init(struct snd_soc_component *component)
 	INIT_WORK(&da7219_aad->hptest_work, da7219_aad_hptest_work);
 	INIT_WORK(&da7219_aad->jack_det_work, da7219_aad_jack_det_work);
 
+	mutex_init(&da7219_aad->jack_det_mutex);
+
 	ret = request_threaded_irq(da7219_aad->irq, da7219_aad_pre_irq_thread,
 				   da7219_aad_irq_thread,
 				   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
-- 
2.39.2