[PATCH 4.4 76/78] ALSA: hda - Clear the leftover component assignment at snd_hdac_i915_exit()

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Iwai <tiwai@xxxxxxx>

commit faafd03d23c913633d2ef7e6ffebdce01b164409 upstream.

The commit [d745f5e7b8b2: ALSA: hda - Add the pin / port mapping on
Intel ILK and VLV] introduced a WARN_ON() to check the pointer for
avoiding the double initializations.  But hdac_acomp pointer wasn't
cleared at snd_hdac_i915_exit(), thus after reloading the HD-audio
driver, it may result in the false positive warning.  This patch makes
sure to clear the leftover pointer at exit.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94736
Reported-by: Daniela Doras-prodan <daniela.doras-prodan@xxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Cc: Kouta Okamoto <kouta.okamoto@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 sound/hda/hdac_i915.c |    1 +
 1 file changed, 1 insertion(+)

--- a/sound/hda/hdac_i915.c
+++ b/sound/hda/hdac_i915.c
@@ -273,6 +273,7 @@ int snd_hdac_i915_exit(struct hdac_bus *
 
 	kfree(acomp);
 	bus->audio_component = NULL;
+	hdac_acomp = NULL;
 
 	return 0;
 }