ALSA: hda - Fix possible runtime PM refcount unbalance

When the driver is unloaded before the codec is bound, it still keeps
the runtime PM refcount up, and results in the unbalance.  This patch
covers these cases by introducing a flag indicating the runtime PM
initialization and handling the codec registration procedure more
properly.  It also fixes the missing input beep device as a gratis,
too.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/hda/hdac_device.c

@@ -109,7 +109,6 @@ int snd_hdac_device_init(struct hdac_device *codec, struct hdac_bus *bus,
 	return 0;
 
  error:
-	pm_runtime_put_noidle(&codec->dev);
 	put_device(&codec->dev);
 	return err;
 }
@@ -121,7 +120,7 @@ EXPORT_SYMBOL_GPL(snd_hdac_device_init);
  */
 void snd_hdac_device_exit(struct hdac_device *codec)
 {
-	/* pm_runtime_put_noidle(&codec->dev); */
+	pm_runtime_put_noidle(&codec->dev);
 	snd_hdac_bus_remove_device(codec->bus, codec);
 	kfree(codec->vendor_name);
 	kfree(codec->chip_name);

sound/pci/hda/hda_bind.c

@@ -95,6 +95,7 @@ static int hda_codec_driver_probe(struct device *dev)
 		err = snd_card_register(codec->card);
 		if (err < 0)
 			goto error_module;
+		snd_hda_codec_register(codec);
 	}
 
 	return 0;

sound/pci/hda/hda_codec.c

@@ -912,6 +912,13 @@ static void codec_release_pcms(struct hda_codec *codec)
 
 void snd_hda_codec_cleanup_for_unbind(struct hda_codec *codec)
 {
+	if (codec->registered) {
+		/* pm_runtime_put() is called in snd_hdac_device_exit() */
+		pm_runtime_get_noresume(hda_codec_dev(codec));
+		pm_runtime_disable(hda_codec_dev(codec));
+		codec->registered = 0;
+	}
+
 	cancel_delayed_work_sync(&codec->jackpoll_work);
 	if (!codec->in_freeing)
 		snd_hda_ctls_clear(codec);
@@ -943,15 +950,23 @@ void snd_hda_codec_cleanup_for_unbind(struct hda_codec *codec)
 static unsigned int hda_set_power_state(struct hda_codec *codec,
 				unsigned int power_state);
 
-static int snd_hda_codec_dev_register(struct snd_device *device)
+/* also called from hda_bind.c */
+void snd_hda_codec_register(struct hda_codec *codec)
 {
-	struct hda_codec *codec = device->device_data;
-
-	snd_hda_register_beep_device(codec);
-	if (device_is_registered(hda_codec_dev(codec)))
+	if (codec->registered)
+		return;
+	if (device_is_registered(hda_codec_dev(codec))) {
+		snd_hda_register_beep_device(codec);
 		pm_runtime_enable(hda_codec_dev(codec));
-	/* it was powered up in snd_hda_codec_new(), now all done */
-	snd_hda_power_down(codec);
+		/* it was powered up in snd_hda_codec_new(), now all done */
+		snd_hda_power_down(codec);
+		codec->registered = 1;
+	}
+}
+
+static int snd_hda_codec_dev_register(struct snd_device *device)
+{
+	snd_hda_codec_register(device->device_data);
 	return 0;
 }
 
@@ -1094,7 +1109,6 @@ int snd_hda_codec_new(struct hda_bus *bus, struct snd_card *card,
 	return 0;
 
  error:
-	pm_runtime_put_noidle(hda_codec_dev(codec));
 	put_device(hda_codec_dev(codec));
 	return err;
 }

sound/pci/hda/hda_codec.h

@@ -314,6 +314,7 @@ struct hda_codec {
 
 	/* misc flags */
 	unsigned int in_freeing:1; /* being released */
+	unsigned int registered:1; /* codec was registered */
 	unsigned int spdif_status_reset :1; /* needs to toggle SPDIF for each
 					     * status change
 					     * (e.g. Realtek codecs)

sound/pci/hda/hda_local.h

@@ -150,6 +150,7 @@ int __snd_hda_add_vmaster(struct hda_codec *codec, char *name,
 #define snd_hda_add_vmaster(codec, name, tlv, slaves, suffix) \
 	__snd_hda_add_vmaster(codec, name, tlv, slaves, suffix, true, NULL)
 int snd_hda_codec_reset(struct hda_codec *codec);
+void snd_hda_codec_register(struct hda_codec *codec);
 void snd_hda_codec_cleanup_for_unbind(struct hda_codec *codec);
 
 enum {