ALSA: hda: add hda link cleanup routine

In HDA extended bus the HDA link objects are created when multilink
capabilities are parsed. We need a routine which free up these link objects
for a bus. So add snd_hdac_link_free_all routine

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/hdaudio_ext.h

@@ -90,6 +90,7 @@ void snd_hdac_ext_stream_init(struct hdac_ext_bus *bus,
 int snd_hdac_ext_stream_init_all(struct hdac_ext_bus *ebus, int start_idx,
 		int num_stream, int dir);
 void snd_hdac_stream_free_all(struct hdac_ext_bus *ebus);
+void snd_hdac_link_free_all(struct hdac_ext_bus *ebus);
 struct hdac_ext_stream *snd_hdac_ext_stream_assign(struct hdac_ext_bus *bus,
 					   struct snd_pcm_substream *substream,
 					   int type);

sound/hda/ext/hdac_ext_controller.c

@@ -193,6 +193,24 @@ int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_ext_bus *ebus)
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities);
 
+/**
+ * snd_hdac_link_free_all- free hdac extended link objects
+ *
+ * @ebus: HD-audio ext core bus
+ */
+
+void snd_hdac_link_free_all(struct hdac_ext_bus *ebus)
+{
+	struct hdac_ext_link *l;
+
+	while (!list_empty(&ebus->hlink_list)) {
+		l = list_first_entry(&ebus->hlink_list, struct hdac_ext_link, list);
+		list_del(&l->list);
+		kfree(l);
+	}
+}
+EXPORT_SYMBOL_GPL(snd_hdac_link_free_all);
+
 /**
  * snd_hdac_ext_bus_get_link_index - get link based on codec name
  * @ebus: HD-audio extended core bus