[PATCH 2/2] ALSA: hda: Add missing sanity checks in PM prepare/complete callbacks

[Takashi Iwai]

The recently added PM prepare and complete callbacks don't have the
sanity check whether the card instance has been properly initialized,
which may potentially lead to Oops.

This patch adds the azx_is_pm_ready() call in each place
appropriately like other PM callbacks.

Fixes: f5dac54d9d93 ("ALSA: hda: Separate runtime and system suspend")
Cc: <stable at vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 sound/pci/hda/hda_intel.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 12e51ac973c4..8a74b5818e91 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1023,6 +1023,9 @@ static int azx_prepare(struct device *dev)
 	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip;
 
+	if (!azx_is_pm_ready(card))
+		return 0;
+
 	chip = card->private_data;
 	chip->pm_prepared = 1;
 	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
@@ -1038,6 +1041,9 @@ static void azx_complete(struct device *dev)
 	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip;
 
+	if (!azx_is_pm_ready(card))
+		return;
+
 	chip = card->private_data;
 	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 	chip->pm_prepared = 0;
-- 
2.26.2