From 63d2a9ec310d8bcc955574220d4631aa55c1a80c Mon Sep 17 00:00:00 2001
From: Sameer Pujar <spujar@nvidia.com>
Date: Wed, 26 Dec 2018 16:04:49 +0530
Subject: [PATCH] ALSA: hda/tegra: clear pending irq handlers
Git-commit: 63d2a9ec310d8bcc955574220d4631aa55c1a80c
Patch-mainline: v5.0-rc1
References: bsc#1051510

Even after disabling interrupts on the module, it could be possible
that irq handlers are still running. System hang is seen during
suspend path. It was found that, there were pending writes on the
HDA bus and clock was disabled by that time.

Above mentioned issue is fixed by clearing any pending irq handlers
before disabling clocks and returning from hda suspend.

Suggested-by: Mohan Kumar <mkumard@nvidia.com>
Suggested-by: Dara Ramesh <dramesh@nvidia.com>
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

---
 sound/pci/hda/hda_tegra.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c
index 83befd8d43e8..97a176d817a0 100644
--- a/sound/pci/hda/hda_tegra.c
+++ b/sound/pci/hda/hda_tegra.c
@@ -234,10 +234,12 @@ static int hda_tegra_suspend(struct device *dev)
 	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip = card->private_data;
 	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
+	struct hdac_bus *bus = azx_bus(chip);
 
 	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 
 	azx_stop_chip(chip);
+	synchronize_irq(bus->irq);
 	azx_enter_link_reset(chip);
 	hda_tegra_disable_clocks(hda);
 
-- 
2.20.1