ALSA: hda/tegra: clear pending irq handlers

commit 63d2a9ec310d8bcc955574220d4631aa55c1a80c upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c
index 0621920f7617f91900591c46970f6cbd03216771..e85fb04ec7be658b0c9e28589eca7fb0550262bd 100644 (file)
--- a/sound/pci/hda/hda_tegra.c
+++ b/sound/pci/hda/hda_tegra.c
@@ -249,10 +249,12 @@ 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);