ASoC: nau8821: Cancel delayed work on component remove

Attempting to unload the driver while a jack detection work is pending
would likely crash the kernel when it is eventually scheduled for
execution:

[ 1984.896308] BUG: unable to handle page fault for address: ffffffffc10c2a20
[...]
[ 1984.896388] Hardware name: Valve Jupiter/Jupiter, BIOS F7A0131 01/30/2024
[ 1984.896396] Workqueue: events nau8821_jdet_work [snd_soc_nau8821]
[ 1984.896414] RIP: 0010:__mutex_lock+0x9f/0x11d0
[...]
[ 1984.896504] Call Trace:
[ 1984.896511]  <TASK>
[ 1984.896524]  ? snd_soc_dapm_disable_pin+0x26/0x60 [snd_soc_core]
[ 1984.896572]  ? snd_soc_dapm_disable_pin+0x26/0x60 [snd_soc_core]
[ 1984.896596]  snd_soc_dapm_disable_pin+0x26/0x60 [snd_soc_core]
[ 1984.896622]  nau8821_jdet_work+0xeb/0x1e0 [snd_soc_nau8821]
[ 1984.896636]  process_one_work+0x211/0x590
[ 1984.896649]  ? srso_return_thunk+0x5/0x5f
[ 1984.896670]  worker_thread+0x1cd/0x3a0

Cancel unscheduled jdet_work or wait for its execution to finish before
the component driver gets removed.

Fixes: aab1ad11d69f ("ASoC: nau8821: new driver")
Fixes: ee70bacef1c6 ("ASoC: nau8821: Avoid unnecessary blocking in IRQ handler")
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://patch.msgid.link/20251231-nau8821-cleanup-v1-2-6b0b76cbbb64@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/nau8821.c b/sound/soc/codecs/nau8821.c
index 2d25a182f4abe587a515d376a6e506f7b0257ab1..2e2714b475012dd3f5c430e7013c9a70e16fefe1 100644 (file)
--- a/sound/soc/codecs/nau8821.c
+++ b/sound/soc/codecs/nau8821.c
@@ -1264,6 +1264,14 @@ static int nau8821_component_probe(struct snd_soc_component *component)
        return 0;
 }
 
+static void nau8821_component_remove(struct snd_soc_component *component)
+{
+       struct nau8821 *nau8821 = snd_soc_component_get_drvdata(component);
+
+       if (nau8821->jdet_active)
+               cancel_delayed_work_sync(&nau8821->jdet_work);
+};
+
 /**
  * nau8821_calc_fll_param - Calculate FLL parameters.
  * @fll_in: external clock provided to codec.
@@ -1621,6 +1629,7 @@ static int __maybe_unused nau8821_resume(struct snd_soc_component *component)
 
 static const struct snd_soc_component_driver nau8821_component_driver = {
        .probe                  = nau8821_component_probe,
+       .remove                 = nau8821_component_remove,
        .set_sysclk             = nau8821_set_sysclk,
        .set_pll                = nau8821_set_fll,
        .set_bias_level         = nau8821_set_bias_level,