AVS HDAudio bus driver does not tie with codec drivers tighly and snd_hda_codec_device_new() can be called after codec's module reload. In such case, rpm is forbidden and invoking pm_runtime_forbid() unconditionally causes device's usage_count to become unbalanced. This is later caught by WARN_ON() found in sound/soc/hda.c. Detect such circumstance and bump the usage_count instead.
Signed-off-by: Cezary Rojewski cezary.rojewski@intel.com --- sound/pci/hda/hda_codec.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c index 9ceb642ac819..83d954ab056f 100644 --- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -1044,8 +1044,14 @@ int snd_hda_codec_device_new(struct hda_bus *bus, struct snd_card *card, goto error; }
+#ifdef CONFIG_PM /* PM runtime needs to be enabled later after binding codec */ - pm_runtime_forbid(&codec->core.dev); + if (codec->core.dev.power.runtime_auto) + pm_runtime_forbid(&codec->core.dev); + else + /* Keep the usage_count consistent across subsequent probing */ + pm_runtime_get_noresume(&codec->core.dev); +#endif
return 0;