ALSA: hda: Add missing sanity checks in PM prepare/complete callbacks

commit 66affb7bb0dc0905155a1b2475261aa704d1ddb5 upstream.

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@vger.kernel.org>
Link: https://lore.kernel.org/r/20210329113059.25035-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index d9a2857b4c331d95f2021d339ce993e3176a233d..ebb1ee69dd0c33dc9f45d8344367218297df33c1 100644 (file)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1022,6 +1022,9 @@ 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);
@@ -1039,6 +1042,9 @@ 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;