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: [email protected] Cc: Takashi Iwai <[email protected]> Cc: Pierre-Louis Bossart <[email protected]> Signed-off-by: Ville Syrjälä <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Reviewed-by: Takashi Iwai <[email protected]>
chewitt · May 3, 2017 · 8d5c303 · 8d5c303
1 parent 183c003
commit 8d5c303
Showing 1 changed file with 5 additions and 0 deletions.
diff --git 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);