[ALSA] opl3 - simplify exclusive access lock

Use the exclusive access lock in hwdep instead of the own one.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

include/sound/opl3.h

@@ -320,7 +320,6 @@ struct snd_opl3 {
 
 	spinlock_t reg_lock;
 	struct snd_card *card;		/* The card that this belongs to */
-	int used;			/* usage flag - exclusive */
 	unsigned char fm_mode;		/* OPL mode, see SNDRV_DM_FM_MODE_XXX */
 	unsigned char rhythm;		/* percussion mode flag */
 	unsigned char max_voices;	/* max number of voices */
@@ -353,7 +352,6 @@ struct snd_opl3 {
 	int sys_timer_status;		/* system timer run status */
 	spinlock_t sys_timer_lock;	/* Lock for system timer access */
 #endif
-	struct mutex access_mutex;	/* locking */
 };
 
 /* opl3.c */

sound/drivers/opl3/opl3_lib.c

@@ -361,7 +361,6 @@ int snd_opl3_new(struct snd_card *card,
 	opl3->hardware = hardware;
 	spin_lock_init(&opl3->reg_lock);
 	spin_lock_init(&opl3->timer_lock);
-	mutex_init(&opl3->access_mutex);
 
 	if ((err = snd_device_new(card, SNDRV_DEV_CODEC, opl3, &ops)) < 0) {
 		snd_opl3_free(opl3);
@@ -497,6 +496,7 @@ int snd_opl3_hwdep_new(struct snd_opl3 * opl3,
 		return err;
 	}
 	hw->private_data = opl3;
+	hw->exclusive = 1;
 #ifdef CONFIG_SND_OSSEMUL
 	if (device == 0) {
 		hw->oss_type = SNDRV_OSS_DEVICE_TYPE_DMFM;

sound/drivers/opl3/opl3_seq.c

@@ -51,14 +51,15 @@ void snd_opl3_synth_use_dec(struct snd_opl3 * opl3)
 int snd_opl3_synth_setup(struct snd_opl3 * opl3)
 {
 	int idx;
+	struct snd_hwdep *hwdep = opl3->hwdep;
 
-	mutex_lock(&opl3->access_mutex);
-	if (opl3->used) {
-		mutex_unlock(&opl3->access_mutex);
+	mutex_lock(&hwdep->open_mutex);
+	if (hwdep->used) {
+		mutex_unlock(&hwdep->open_mutex);
 		return -EBUSY;
 	}
-	opl3->used++;
-	mutex_unlock(&opl3->access_mutex);
+	hwdep->used++;
+	mutex_unlock(&hwdep->open_mutex);
 
 	snd_opl3_reset(opl3);
 
@@ -91,9 +92,11 @@ void snd_opl3_synth_cleanup(struct snd_opl3 * opl3)
 	spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
 
 	snd_opl3_reset(opl3);
-	mutex_lock(&opl3->access_mutex);
-	opl3->used--;
-	mutex_unlock(&opl3->access_mutex);
+	hwdep = opl3->hwdep;
+	mutex_lock(&hwdep->open_mutex);
+	hwdep->used--;
+	mutex_unlock(&hwdep->open_mutex);
+	wake_up(&hwdep->open_wait);
 }
 
 static int snd_opl3_synth_use(void *private_data, struct snd_seq_port_subscribe * info)

sound/drivers/opl3/opl3_synth.c

@@ -76,16 +76,6 @@ static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection);
  */
 int snd_opl3_open(struct snd_hwdep * hw, struct file *file)
 {
-	struct snd_opl3 *opl3 = hw->private_data;
-
-	mutex_lock(&opl3->access_mutex);
-	if (opl3->used) {
-		mutex_unlock(&opl3->access_mutex);
-		return -EAGAIN;
-	}
-	opl3->used++;
-	mutex_unlock(&opl3->access_mutex);
-
 	return 0;
 }
 
@@ -185,10 +175,6 @@ int snd_opl3_release(struct snd_hwdep * hw, struct file *file)
 	struct snd_opl3 *opl3 = hw->private_data;
 
 	snd_opl3_reset(opl3);
-	mutex_lock(&opl3->access_mutex);
-	opl3->used--;
-	mutex_unlock(&opl3->access_mutex);
-
 	return 0;
 }