From: Takashi Iwai <tiwai@suse.de>
Date: Tue, 14 Apr 2009 14:15:29 +0000 (+0200)
Subject: ALSA: hda - Avoid call of snd_jack_report at release
X-Git-Tag: v2.6.30-rc3~86^2^2~2^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=95c0909961bc5ff18c78b2ab0d093cddc0a8b0b5;p=platform%2Fkernel%2Flinux-exynos.git

ALSA: hda - Avoid call of snd_jack_report at release

Don't call snd_jack_report at release of sigmatel and conexnat codecs
which results in Oops at unloading the module.

The Oops is triggered by the power-up sequence during the free due to
the pincfg restoration.  Since the power-up sequence is involved with
the unsol handling, the jack reporting may be issued during that.
The Oops occurs with this jack reporting because the jack instances
have been already released but the codec doesn't do the proper
book-keeping.

This patch adds the book-keeping of jack instances to avoid the access
to bogus pointers.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c
index 1f2ad76..56ce19e 100644
--- a/sound/pci/hda/patch_conexant.c
+++ b/sound/pci/hda/patch_conexant.c
@@ -350,12 +350,20 @@ static int conexant_mux_enum_put(struct snd_kcontrol *kcontrol,
 }
 
 #ifdef CONFIG_SND_JACK
+static void conexant_free_jack_priv(struct snd_jack *jack)
+{
+	struct conexant_jack *jacks = jack->private_data;
+	jacks->nid = 0;
+	jacks->jack = NULL;
+}
+
 static int conexant_add_jack(struct hda_codec *codec,
 		hda_nid_t nid, int type)
 {
 	struct conexant_spec *spec;
 	struct conexant_jack *jack;
 	const char *name;
+	int err;
 
 	spec = codec->spec;
 	snd_array_init(&spec->jacks, sizeof(*jack), 32);
@@ -368,7 +376,12 @@ static int conexant_add_jack(struct hda_codec *codec,
 	jack->nid = nid;
 	jack->type = type;
 
-	return snd_jack_new(codec->bus->card, name, type, &jack->jack);
+	err = snd_jack_new(codec->bus->card, name, type, &jack->jack);
+	if (err < 0)
+		return err;
+	jack->jack->private_data = jack;
+	jack->jack->private_free = conexant_free_jack_priv;
+	return 0;
 }
 
 static void conexant_report_jack(struct hda_codec *codec, hda_nid_t nid)
@@ -455,8 +468,10 @@ static void conexant_free(struct hda_codec *codec)
 	if (spec->jacks.list) {
 		struct conexant_jack *jacks = spec->jacks.list;
 		int i;
-		for (i = 0; i < spec->jacks.used; i++)
-			snd_device_free(codec->bus->card, &jacks[i].jack);
+		for (i = 0; i < spec->jacks.used; i++, jacks++) {
+			if (jacks->jack)
+				snd_device_free(codec->bus->card, jacks->jack);
+		}
 		snd_array_free(&spec->jacks);
 	}
 #endif
diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 61996a2..ce30b45 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -3851,6 +3851,15 @@ static void stac_gpio_set(struct hda_codec *codec, unsigned int mask,
 			   AC_VERB_SET_GPIO_DATA, gpiostate); /* sync */
 }
 
+#ifdef CONFIG_SND_JACK
+static void stac92xx_free_jack_priv(struct snd_jack *jack)
+{
+	struct sigmatel_jack *jacks = jack->private_data;
+	jacks->nid = 0;
+	jacks->jack = NULL;
+}
+#endif
+
 static int stac92xx_add_jack(struct hda_codec *codec,
 		hda_nid_t nid, int type)
 {
@@ -3860,6 +3869,7 @@ static int stac92xx_add_jack(struct hda_codec *codec,
 	int def_conf = snd_hda_codec_get_pincfg(codec, nid);
 	int connectivity = get_defcfg_connect(def_conf);
 	char name[32];
+	int err;
 
 	if (connectivity && connectivity != AC_JACK_PORT_FIXED)
 		return 0;
@@ -3876,10 +3886,15 @@ static int stac92xx_add_jack(struct hda_codec *codec,
 		snd_hda_get_jack_connectivity(def_conf),
 		snd_hda_get_jack_location(def_conf));
 
-	return snd_jack_new(codec->bus->card, name, type, &jack->jack);
-#else
-	return 0;
+	err = snd_jack_new(codec->bus->card, name, type, &jack->jack);
+	if (err < 0) {
+		jack->nid = 0;
+		return err;
+	}
+	jack->jack->private_data = jack;
+	jack->jack->private_free = stac92xx_free_jack_priv;
 #endif
+	return 0;
 }
 
 static int stac_add_event(struct sigmatel_spec *spec, hda_nid_t nid,
@@ -4138,8 +4153,10 @@ static void stac92xx_free_jacks(struct hda_codec *codec)
 	if (!codec->bus->shutdown && spec->jacks.list) {
 		struct sigmatel_jack *jacks = spec->jacks.list;
 		int i;
-		for (i = 0; i < spec->jacks.used; i++)
-			snd_device_free(codec->bus->card, &jacks[i].jack);
+		for (i = 0; i < spec->jacks.used; i++, jacks++) {
+			if (jacks->jack)
+				snd_device_free(codec->bus->card, jacks->jack);
+		}
 	}
 	snd_array_free(&spec->jacks);
 #endif