[PATCH AUTOSEL 5.1 148/219] ASoC: Intel: hdac_hdmi: Set ops to NULL on remove

Sasha Levin
2019-07-15T14:12:49Z

From: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>

[ Upstream commit 0f6ff78540bd1b4df1e0f17806b0ce2e1dff0d78 ]

When we unload Skylake driver we may end up calling
hdac_component_master_unbind(), it uses acomp->audio_ops, which we set
in hdmi_codec_probe(), so we need to set it to NULL in hdmi_codec_remove(),
otherwise we will dereference no longer existing pointer.

Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/codecs/hdac_hdmi.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/sound/soc/codecs/hdac_hdmi.c b/sound/soc/codecs/hdac_hdmi.c
index 4de1fbfa8827..65177ca64827 100644
--- a/sound/soc/codecs/hdac_hdmi.c
+++ b/sound/soc/codecs/hdac_hdmi.c
@@ -1880,6 +1880,12 @@ static void hdmi_codec_remove(struct snd_soc_component *component)
{
struct hdac_hdmi_priv *hdmi = snd_soc_component_get_drvdata(component);
struct hdac_device *hdev = hdmi->hdev;
+ int ret;
+
+ ret = snd_hdac_acomp_register_notifier(hdev->bus, NULL);
+ if (ret < 0)
+ dev_err(&hdev->dev, "notifier unregister failed: err: %d\n",
+ ret);

pm_runtime_disable(&hdev->dev);
}
--
2.20.1