ALSA: hda - create hda_codec.control_mutex for kcontrol->private_value

Fix the following lockdep warning by not reusing the hda_codec.spdif_mutex.

    ALSA sound/pci/hda/hda_codec.c:882: hda_codec_cleanup_stream: NID=0x2

    =======================================================
    [ INFO: possible circular locking dependency detected ]
    2.6.28-next-20090102 #33
    -------------------------------------------------------
    mplayer/3151 is trying to acquire lock:
     (&pcm->open_mutex){--..}, at: [<ffffffffa004ced3>] snd_pcm_release+0x43/0xd0 [snd_pcm]

    but task is already holding lock:
     (&mm->mmap_sem){----}, at: [<ffffffff810c0252>] sys_munmap+0x42/0x80

    which lock already depends on the new lock.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 20 insertions, 18 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index e16cf63821ae..f80e5f3b97dc 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -735,6 +735,7 @@ int /*__devinit*/ snd_hda_codec_new(struct hda_bus *bus, unsigned int codec_addr
         codec->bus = bus;
         codec->addr = codec_addr;
         mutex_init(&codec->spdif_mutex);
+        mutex_init(&codec->control_mutex);
         init_hda_cache(&codec->amp_cache, sizeof(struct hda_amp_info));
         init_hda_cache(&codec->cmd_cache, sizeof(struct hda_cache_head));
         snd_array_init(&codec->mixers, sizeof(struct snd_kcontrol *), 32);
@@ -1418,12 +1419,12 @@ int snd_hda_mixer_bind_switch_get(struct snd_kcontrol *kcontrol,
         unsigned long pval;
         int err;
 
-        mutex_lock(&codec->spdif_mutex); /* reuse spdif_mutex */
+        mutex_lock(&codec->control_mutex);
         pval = kcontrol->private_value;
         kcontrol->private_value = pval & ~AMP_VAL_IDX_MASK; /* index 0 */
         err = snd_hda_mixer_amp_switch_get(kcontrol, ucontrol);
         kcontrol->private_value = pval;
-        mutex_unlock(&codec->spdif_mutex);
+        mutex_unlock(&codec->control_mutex);
         return err;
 }
 EXPORT_SYMBOL_HDA(snd_hda_mixer_bind_switch_get);
@@ -1435,7 +1436,7 @@ int snd_hda_mixer_bind_switch_put(struct snd_kcontrol *kcontrol,
         unsigned long pval;
         int i, indices, err = 0, change = 0;
 
-        mutex_lock(&codec->spdif_mutex); /* reuse spdif_mutex */
+        mutex_lock(&codec->control_mutex);
         pval = kcontrol->private_value;
         indices = (pval & AMP_VAL_IDX_MASK) >> AMP_VAL_IDX_SHIFT;
         for (i = 0; i < indices; i++) {
@@ -1447,7 +1448,7 @@ int snd_hda_mixer_bind_switch_put(struct snd_kcontrol *kcontrol,
                 change |= err;
         }
         kcontrol->private_value = pval;
-        mutex_unlock(&codec->spdif_mutex);
+        mutex_unlock(&codec->control_mutex);
         return err < 0 ? err : change;
 }
 EXPORT_SYMBOL_HDA(snd_hda_mixer_bind_switch_put);
@@ -1462,12 +1463,12 @@ int snd_hda_mixer_bind_ctls_info(struct snd_kcontrol *kcontrol,
         struct hda_bind_ctls *c;
         int err;
 
-        mutex_lock(&codec->spdif_mutex); /* reuse spdif_mutex */
+        mutex_lock(&codec->control_mutex);
         c = (struct hda_bind_ctls *)kcontrol->private_value;
         kcontrol->private_value = *c->values;
         err = c->ops->info(kcontrol, uinfo);
         kcontrol->private_value = (long)c;
-        mutex_unlock(&codec->spdif_mutex);
+        mutex_unlock(&codec->control_mutex);
         return err;
 }
 EXPORT_SYMBOL_HDA(snd_hda_mixer_bind_ctls_info);
@@ -1479,12 +1480,12 @@ int snd_hda_mixer_bind_ctls_get(struct snd_kcontrol *kcontrol,
         struct hda_bind_ctls *c;
         int err;
 
-        mutex_lock(&codec->spdif_mutex); /* reuse spdif_mutex */
+        mutex_lock(&codec->control_mutex);
         c = (struct hda_bind_ctls *)kcontrol->private_value;
         kcontrol->private_value = *c->values;
         err = c->ops->get(kcontrol, ucontrol);
         kcontrol->private_value = (long)c;
-        mutex_unlock(&codec->spdif_mutex);
+        mutex_unlock(&codec->control_mutex);
         return err;
 }
 EXPORT_SYMBOL_HDA(snd_hda_mixer_bind_ctls_get);
@@ -1497,7 +1498,7 @@ int snd_hda_mixer_bind_ctls_put(struct snd_kcontrol *kcontrol,
         unsigned long *vals;
         int err = 0, change = 0;
 
-        mutex_lock(&codec->spdif_mutex); /* reuse spdif_mutex */
+        mutex_lock(&codec->control_mutex);
         c = (struct hda_bind_ctls *)kcontrol->private_value;
         for (vals = c->values; *vals; vals++) {
                 kcontrol->private_value = *vals;
@@ -1507,7 +1508,7 @@ int snd_hda_mixer_bind_ctls_put(struct snd_kcontrol *kcontrol,
                 change |= err;
         }
         kcontrol->private_value = (long)c;
-        mutex_unlock(&codec->spdif_mutex);
+        mutex_unlock(&codec->control_mutex);
         return err < 0 ? err : change;
 }
 EXPORT_SYMBOL_HDA(snd_hda_mixer_bind_ctls_put);
@@ -1519,12 +1520,12 @@ int snd_hda_mixer_bind_tlv(struct snd_kcontrol *kcontrol, int op_flag,
         struct hda_bind_ctls *c;
         int err;
 
-        mutex_lock(&codec->spdif_mutex); /* reuse spdif_mutex */
+        mutex_lock(&codec->control_mutex);
         c = (struct hda_bind_ctls *)kcontrol->private_value;
         kcontrol->private_value = *c->values;
         err = c->ops->tlv(kcontrol, op_flag, size, tlv);
         kcontrol->private_value = (long)c;
-        mutex_unlock(&codec->spdif_mutex);
+        mutex_unlock(&codec->control_mutex);
         return err;
 }
 EXPORT_SYMBOL_HDA(snd_hda_mixer_bind_tlv);
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 729fc7642d7f..e9c723e13e5d 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -771,6 +771,7 @@ struct hda_codec {
         struct hda_cache_rec cmd_cache; /* cache for other commands */
 
         struct mutex spdif_mutex;
+        struct mutex control_mutex;
         unsigned int spdif_status;      /* IEC958 status bits */
         unsigned short spdif_ctls;      /* SPDIF control bits */
         unsigned int spdif_in_enable;   /* SPDIF input enable? */
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index e8ec74173525..aa86a1584506 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -1502,11 +1502,11 @@ static int alc_cap_vol_info(struct snd_kcontrol *kcontrol,
         struct alc_spec *spec = codec->spec;
         int err;
 
-        mutex_lock(&codec->spdif_mutex); /* reuse spdif_mutex */
+        mutex_lock(&codec->control_mutex);
         kcontrol->private_value = HDA_COMPOSE_AMP_VAL(spec->adc_nids[0], 3, 0,
                                                       HDA_INPUT);
         err = snd_hda_mixer_amp_volume_info(kcontrol, uinfo);
-        mutex_unlock(&codec->spdif_mutex); /* reuse spdif_mutex */
+        mutex_unlock(&codec->control_mutex);
         return err;
 }
 
@@ -1517,11 +1517,11 @@ static int alc_cap_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
         struct alc_spec *spec = codec->spec;
         int err;
 
-        mutex_lock(&codec->spdif_mutex); /* reuse spdif_mutex */
+        mutex_lock(&codec->control_mutex);
         kcontrol->private_value = HDA_COMPOSE_AMP_VAL(spec->adc_nids[0], 3, 0,
                                                       HDA_INPUT);
         err = snd_hda_mixer_amp_tlv(kcontrol, op_flag, size, tlv);
-        mutex_unlock(&codec->spdif_mutex); /* reuse spdif_mutex */
+        mutex_unlock(&codec->control_mutex);
         return err;
 }
 
@@ -1537,11 +1537,11 @@ static int alc_cap_getput_caller(struct snd_kcontrol *kcontrol,
         unsigned int adc_idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
         int err;
 
-        mutex_lock(&codec->spdif_mutex); /* reuse spdif_mutex */
+        mutex_lock(&codec->control_mutex);
         kcontrol->private_value = HDA_COMPOSE_AMP_VAL(spec->adc_nids[adc_idx],
                                                       3, 0, HDA_INPUT);
         err = func(kcontrol, ucontrol);
-        mutex_unlock(&codec->spdif_mutex); /* reuse spdif_mutex */
+        mutex_unlock(&codec->control_mutex);
         return err;
 }