commit 8d5c30308d7c5a17db96fa5452c0232f633377c2
author Ville Syrjälä <ville.syrjala@linux.intel.com> Thu Apr 27 19:02:21 2017 +0300
committer Ville Syrjälä <ville.syrjala@linux.intel.com> Wed May 03 16:19:07 2017 +0300
tree c4abcbd258fe586acc4ff7fd8a1566afbd29af36
parent 183c00350ccda86781f6695840e6c5f5b22efbd1

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>

sound/x86/intel_hdmi_audio.c

diff --git a/sound/x86/intel_hdmi_audio.c b/sound/x86/intel_hdmi_audio.c
index bfac6f2..5b89662 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);