ALSA: x86: Clear the pdata.notify_lpe_audio pointer before teardown

Clear the notify function pointer in the platform data before we tear
down the driver. Otherwise i915 would end up calling a stale function
pointer and possibly explode.

Cc: stable@vger.kernel.org
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170427160231.13337-3-ville.syrjala@linux.intel.com
Reviewed-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/sound/x86/intel_hdmi_audio.c b/sound/x86/intel_hdmi_audio.c
index bfac6f21ae5e..5b89662493c9 100644
--- a/sound/x86/intel_hdmi_audio.c
+++ b/sound/x86/intel_hdmi_audio.c
@@ -1665,6 +1665,11 @@ static int __maybe_unused hdmi_lpe_audio_resume(struct device *dev)
 static void hdmi_lpe_audio_free(struct snd_card *card)
 {
         struct snd_intelhad *ctx = card->private_data;
+        struct intel_hdmi_lpe_audio_pdata *pdata = ctx->dev->platform_data;
+
+        spin_lock_irq(&pdata->lpe_audio_slock);
+        pdata->notify_audio_lpe = NULL;
+        spin_unlock_irq(&pdata->lpe_audio_slock);
 
         cancel_work_sync(&ctx->hdmi_audio_wq);