[PATCH 4/9] ALSA: hda: Fix put_device() inconsistency in error path

[Cezary Rojewski <cezary.rojewski@xxxxxxxxx>]

AVS HDAudio bus driver does not tie with codec drivers tighly. Codec
device and its respective driver cleanup procedures are split and may
not occur one after the other. Device cleanup is performed only on
snd_hdac_ext_bus_device_remove() i.e. it's the bus driver's
responsibility. If codec component probing fails, put_device() found in
snd_hda_codec_device_new() may lead to page fault. Relocate it to
snd_hda_codec_new() to address the problem on ASoC side while keeping
status quo for snd_hda_intel.

Signed-off-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
---
 sound/pci/hda/hda_codec.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 83d954ab056f..2381aced492f 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -949,6 +949,7 @@ int snd_hda_codec_new(struct hda_bus *bus, struct snd_card *card,
 		      unsigned int codec_addr, struct hda_codec **codecp)
 {
 	struct hda_codec *codec;
+	int ret;
 
 	codec = snd_hda_codec_device_init(bus, codec_addr, "hdaudioC%dD%d",
 					  card->number, codec_addr);
@@ -956,7 +957,11 @@ int snd_hda_codec_new(struct hda_bus *bus, struct snd_card *card,
 		return PTR_ERR(codec);
 	*codecp = codec;
 
-	return snd_hda_codec_device_new(bus, card, codec_addr, *codecp, true);
+	ret = snd_hda_codec_device_new(bus, card, codec_addr, *codecp, true);
+	if (ret)
+		put_device(hda_codec_dev(*codecp));
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_new);
 
@@ -1011,19 +1016,17 @@ int snd_hda_codec_device_new(struct hda_bus *bus, struct snd_card *card,
 
 	if (codec->bus->modelname) {
 		codec->modelname = kstrdup(codec->bus->modelname, GFP_KERNEL);
-		if (!codec->modelname) {
-			err = -ENOMEM;
-			goto error;
-		}
+		if (!codec->modelname)
+			return -ENOMEM;
 	}
 
 	fg = codec->core.afg ? codec->core.afg : codec->core.mfg;
 	err = read_widget_caps(codec, fg);
 	if (err < 0)
-		goto error;
+		return err;
 	err = read_pin_defaults(codec);
 	if (err < 0)
-		goto error;
+		return err;
 
 	/* power-up all before initialization */
 	hda_set_power_state(codec, AC_PWRST_D0);
@@ -1041,7 +1044,7 @@ int snd_hda_codec_device_new(struct hda_bus *bus, struct snd_card *card,
 		/* ASoC features component management instead */
 		err = snd_device_new(card, SNDRV_DEV_CODEC, codec, &dev_ops);
 		if (err < 0)
-			goto error;
+			return err;
 	}
 
 #ifdef CONFIG_PM
@@ -1054,10 +1057,6 @@ int snd_hda_codec_device_new(struct hda_bus *bus, struct snd_card *card,
 #endif
 
 	return 0;
-
- error:
-	put_device(hda_codec_dev(codec));
-	return err;
 }
 EXPORT_SYMBOL_GPL(snd_hda_codec_device_new);
 
-- 
2.25.1