[PATCH] ASoC: hdac_hda: fix page fault issue by removing race

[Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>]

From: Keyon Jie <yang.jie@linux.intel.com>

There is a race between hda codec device removing and the
jack-detecting work, which will lead to a page fault issue as the
latter work is accessing codec device which could be already removed.

Here add the cancellation of jack-detecting work before codecs are actually
removed to avoid the race and fix the issue.

Bug: https://github.com/thesofproject/linux/issues/1067
Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/soc/codecs/hdac_hda.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/codecs/hdac_hda.c b/sound/soc/codecs/hdac_hda.c
index 7d4940256914..91242b6f8ea7 100644
--- a/sound/soc/codecs/hdac_hda.c
+++ b/sound/soc/codecs/hdac_hda.c
@@ -495,6 +495,10 @@ static int hdac_hda_dev_probe(struct hdac_device *hdev)
 
 static int hdac_hda_dev_remove(struct hdac_device *hdev)
 {
+	struct hdac_hda_priv *hda_pvt;
+
+	hda_pvt = dev_get_drvdata(&hdev->dev);
+	cancel_delayed_work_sync(&hda_pvt->codec.jackpoll_work);
 	return 0;
 }
 
-- 
2.20.1