ASoC: hdmi-codec: remove HDMI device unregister

While unregistering the hdmi-codec, the hdmi device list must be
cleaned up. It avoid kernel page fault when registering again the
hdmi-codec.

Signed-off-by: Vincent Abriou <vincent.abriou@st.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 22 insertions, 3 deletions

diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c
index dc6715a804a1..8c5ae1fc23a9 100644
--- a/sound/soc/codecs/hdmi-codec.c
+++ b/sound/soc/codecs/hdmi-codec.c
@@ -32,6 +32,7 @@ struct hdmi_device {
 };
 #define pos_to_hdmi_device(pos) container_of((pos), struct hdmi_device, list)
 LIST_HEAD(hdmi_device_list);
+static DEFINE_MUTEX(hdmi_mutex);
 
 #define DAI_NAME_SIZE 16
 
@@ -794,6 +795,7 @@ static int hdmi_codec_probe(struct platform_device *pdev)
                 return -ENOMEM;
 
         hd = NULL;
+        mutex_lock(&hdmi_mutex);
         list_for_each(pos, &hdmi_device_list) {
                 struct hdmi_device *tmp = pos_to_hdmi_device(pos);
 
@@ -805,13 +807,16 @@ static int hdmi_codec_probe(struct platform_device *pdev)
 
         if (!hd) {
                 hd = devm_kzalloc(dev, sizeof(*hd), GFP_KERNEL);
-                if (!hd)
+                if (!hd) {
+                        mutex_unlock(&hdmi_mutex);
                         return -ENOMEM;
+                }
 
                 hd->dev = dev->parent;
 
                 list_add_tail(&hd->list, &hdmi_device_list);
         }
+        mutex_unlock(&hdmi_mutex);
 
         if (hd->cnt >= ARRAY_SIZE(hdmi_dai_name)) {
                 dev_err(dev, "too many hdmi codec are deteced\n");
@@ -853,11 +858,25 @@ static int hdmi_codec_probe(struct platform_device *pdev)
 
 static int hdmi_codec_remove(struct platform_device *pdev)
 {
+        struct device *dev = &pdev->dev;
+        struct list_head *pos;
         struct hdmi_codec_priv *hcp;
 
-        hcp = dev_get_drvdata(&pdev->dev);
+        mutex_lock(&hdmi_mutex);
+        list_for_each(pos, &hdmi_device_list) {
+                struct hdmi_device *tmp = pos_to_hdmi_device(pos);
+
+                if (tmp->dev == dev->parent) {
+                        list_del(pos);
+                        break;
+                }
+        }
+        mutex_unlock(&hdmi_mutex);
+
+        hcp = dev_get_drvdata(dev);
         kfree(hcp->chmap_info);
-        snd_soc_unregister_codec(&pdev->dev);
+        snd_soc_unregister_codec(dev);
+
         return 0;
 }