4.4-stable review patch. If anyone has any objections, please let me know.
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From: Sameer Pujar spujar@nvidia.com
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
--- sound/pci/hda/hda_tegra.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/sound/pci/hda/hda_tegra.c +++ b/sound/pci/hda/hda_tegra.c @@ -249,10 +249,12 @@ static int hda_tegra_suspend(struct devi 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);