[PATCH 4/7] ASoC: codecs: wsa884x: disable runtime PM on unbind

[Srinivas Kandagatla]

Probe enables runtime PM but nothing disables it on unbind. The pending
autosuspend then runs wsa884x_runtime_suspend() after the devm-managed
regmap is freed, and dereferences NULL:

  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020
  pc : regcache_cache_only+0x18/0x80
  lr : wsa884x_runtime_suspend+0x24/0x40 [snd_soc_wsa884x]

Use devm_pm_runtime_enable() so runtime PM is disabled before the regmap
is freed.

Fixes: aa21a7d4f68a ("ASoC: codecs: wsa884x: Add WSA884x family of speakers")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxxxxxxxx>
---
 sound/soc/codecs/wsa884x.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/wsa884x.c b/sound/soc/codecs/wsa884x.c
index f0857c0588d5..3c008224d32e 100644
--- a/sound/soc/codecs/wsa884x.c
+++ b/sound/soc/codecs/wsa884x.c
@@ -2125,7 +2125,9 @@ static int wsa884x_probe(struct sdw_slave *pdev,
 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_set_active(dev);
-	pm_runtime_enable(dev);
+	ret = devm_pm_runtime_enable(dev);
+	if (ret)
+		return ret;
 
 	return devm_snd_soc_register_component(dev,
 					       &wsa884x_component_drv,
-- 
2.47.3