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>

1 files changed, 18 insertions, 3 deletions

diff --git a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c
index 1f2ad76ca94..56ce19e68cb 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