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ALSA: hda - Avoid doubly suspend after vga switcheroo 

The HD-audio driver artificially calls the suspend and the resume code
path in the VGA switcheroo state changes.  When a machine goes to
suspend, it tries to suspend the device again, and it stalls at
snd_power_wait().

This patch adds checks whether the devices were already in (forced)
suspend in PM callbacks for avoiding the doubly suspend.

Reported-by: Daniel J Blueman <daniel@quora.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2012-12-04 17:01:25 +01:00
parent 1d31affbef
commit c5c215232d
1 changed files with 6 additions and 0 deletions
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6
sound/pci/hda/hda_intel.c
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@ -2630,6 +2630,9 @@ static int azx_suspend(struct device *dev)
struct azx *chip = card->private_data;
struct azx_pcm *p;
if (chip->disabled)
return 0;
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
azx_clear_irq_pending(chip);
list_for_each_entry(p, &chip->pcm_list, list)
@ -2655,6 +2658,9 @@ static int azx_resume(struct device *dev)
struct snd_card *card = dev_get_drvdata(dev);
struct azx *chip = card->private_data;
if (chip->disabled)
return 0;
pci_set_power_state(pci, PCI_D0);
pci_restore_state(pci);
if (pci_enable_device(pci) < 0) {