[PATCH 02/11] ALSA: x86: Clear the pdata.notify_lpe_audio pointer before teardown

From: ville.syrjala@linux.intel.com
To: intel-gfx@lists.freedesktop.org
Cc: Takashi Iwai <tiwai@suse.de>, alsa-devel@alsa-project.org
Subject: [PATCH 02/11] ALSA: x86: Clear the pdata.notify_lpe_audio pointer before teardown
Date: Thu, 27 Apr 2017 19:02:21 +0300	[thread overview]
Message-ID: <20170427160231.13337-3-ville.syrjala@linux.intel.com> (raw)
In-Reply-To: <20170427160231.13337-1-ville.syrjala@linux.intel.com>

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

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: 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>
---
 sound/x86/intel_hdmi_audio.c | 5 +++++
 1 file changed, 5 insertions(+)

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);
 
-- 
2.10.2

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