[alsa-devel] [PATCH v2] ALSA: hda - Fix race condition between HDA driver and runtime PM

[U. Artie Eoff]

Don't execute runtime suspend if HDA is not finished initializing.
Otherwise, the following errors can occur in hda:

snd_hda_intel 0000:00:1b.0: CORB reset timeout#2, CORBRP = 65535
snd_hda_intel 0000:00:1b.0: no codecs initialized

Debugged and root-cause found by zhuo-hao.lee at intel.com

v2: remove unnecessary extra check for chip init (libin)

Signed-off-by: U. Artie Eoff <ullysses.a.eoff at intel.com>
---
 sound/pci/hda/hda_intel.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index b729b25a6ad6..15d4e28fc64e 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1017,17 +1017,19 @@ static int azx_runtime_idle(struct device *dev)
 	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip;
 	struct hda_intel *hda;
+	struct hdac_bus *bus;
 
 	if (!card)
 		return 0;
 
 	chip = card->private_data;
 	hda = container_of(chip, struct hda_intel, chip);
+	bus = azx_bus(chip);
 	if (chip->disabled || hda->init_failed || !chip->running)
 		return 0;
 
 	if (!power_save_controller || !azx_has_pm_runtime(chip) ||
-	    azx_bus(chip)->codec_powered)
+	    bus->codec_powered || !bus->chip_init)
 		return -EBUSY;
 
 	return 0;
-- 
1.9.3