ALSA: Simplify snd_device_register() variants

Now that all callers have been replaced with
snd_device_register_for_dev(), let's drop the obsolete device
registration code and concentrate only on the code handling struct
device directly.  That said,

- remove the old snd_device_register(),
- rename snd_device_register_for_dev() with snd_device_register(),
- drop superfluous arguments from snd_device_register(),
- change snd_unregister_device() to pass the device pointer directly

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/include/sound/core.h b/include/sound/core.h
index 4b7e04e..67ac309 100644 (file)
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -187,7 +187,6 @@ struct snd_minor {
        int type;                       /* SNDRV_DEVICE_TYPE_XXX */
        int card;                       /* card number */
        int device;                     /* device number */
-       bool created;
        const struct file_operations *f_ops;    /* file operations */
        void *private_data;             /* private data for f_ops->open */
        struct device *dev;             /* device for sysfs */
@@ -210,40 +209,10 @@ void snd_request_card(int card);
 
 void snd_device_initialize(struct device *dev, struct snd_card *card);
 
-int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
-                               const struct file_operations *f_ops,
-                               void *private_data, struct device *device,
-                               struct device *parent, const char *name);
-
-/**
- * snd_register_device - Register the ALSA device file for the card
- * @type: the device type, SNDRV_DEVICE_TYPE_XXX
- * @card: the card instance
- * @dev: the device index
- * @f_ops: the file operations
- * @private_data: user pointer for f_ops->open()
- * @name: the device file name
- *
- * Registers an ALSA device file for the given card.
- * The operators have to be set in reg parameter.
- *
- * This function uses the card's device pointer to link to the
- * correct &struct device.
- *
- * Return: Zero if successful, or a negative error code on failure.
- */
-static inline int snd_register_device(int type, struct snd_card *card, int dev,
-                                     const struct file_operations *f_ops,
-                                     void *private_data,
-                                     const char *name)
-{
-       return snd_register_device_for_dev(type, card, dev, f_ops,
-                                          private_data, NULL,
-                                          snd_card_get_device_link(card),
-                                          name);
-}
-
-int snd_unregister_device(int type, struct snd_card *card, int dev);
+int snd_register_device(int type, struct snd_card *card, int dev,
+                       const struct file_operations *f_ops,
+                       void *private_data, struct device *device);
+int snd_unregister_device(struct device *dev);
 void *snd_lookup_minor_data(unsigned int minor, int type);
 struct device *snd_get_device(int type, struct snd_card *card, int dev);
 

diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index cb58c3f..b123c42 100644 (file)
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -871,10 +871,9 @@ static int snd_compress_dev_register(struct snd_device *device)
        pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
                        compr->direction);
        /* register compressed device */
-       ret = snd_register_device_for_dev(SNDRV_DEVICE_TYPE_COMPRESS,
-                                         compr->card, compr->device,
-                                         &snd_compr_file_ops, compr,
-                                         &compr->dev, NULL, NULL);
+       ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
+                                 compr->card, compr->device,
+                                 &snd_compr_file_ops, compr, &compr->dev);
        if (ret < 0) {
                pr_err("snd_register_device failed\n %d", ret);
                return ret;
@@ -888,8 +887,7 @@ static int snd_compress_dev_disconnect(struct snd_device *device)
        struct snd_compr *compr;
 
        compr = device->device_data;
-       snd_unregister_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
-               compr->device);
+       snd_unregister_device(&compr->dev);
        return 0;
 }
 

diff --git a/sound/core/control.c b/sound/core/control.c
index e214fab..60caba1 100644 (file)
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1661,9 +1661,8 @@ static int snd_ctl_dev_register(struct snd_device *device)
 {
        struct snd_card *card = device->device_data;
 
-       return snd_register_device_for_dev(SNDRV_DEVICE_TYPE_CONTROL, card,
-                                          -1, &snd_ctl_f_ops, card,
-                                          &card->ctl_dev, NULL, NULL);
+       return snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
+                                  &snd_ctl_f_ops, card, &card->ctl_dev);
 }
 
 /*
@@ -1681,7 +1680,7 @@ static int snd_ctl_dev_disconnect(struct snd_device *device)
        }
        read_unlock(&card->ctl_files_rwlock);
 
-       return snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1);
+       return snd_unregister_device(&card->ctl_dev);
 }
 
 /*

diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
index 506387b..84244a5 100644 (file)
--- a/sound/core/hwdep.c
+++ b/sound/core/hwdep.c
@@ -432,10 +432,9 @@ static int snd_hwdep_dev_register(struct snd_device *device)
                return -EBUSY;
        }
        list_add_tail(&hwdep->list, &snd_hwdep_devices);
-       err = snd_register_device_for_dev(SNDRV_DEVICE_TYPE_HWDEP,
-                                         hwdep->card, hwdep->device,
-                                         &snd_hwdep_f_ops, hwdep,
-                                         &hwdep->dev, NULL, NULL);
+       err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
+                                 hwdep->card, hwdep->device,
+                                 &snd_hwdep_f_ops, hwdep, &hwdep->dev);
        if (err < 0) {
                dev_err(&hwdep->dev, "unable to register\n");
                list_del(&hwdep->list);
@@ -480,7 +479,7 @@ static int snd_hwdep_dev_disconnect(struct snd_device *device)
        if (hwdep->ossreg)
                snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
 #endif
-       snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
+       snd_unregister_device(&hwdep->dev);
        list_del_init(&hwdep->list);
        mutex_unlock(&hwdep->open_mutex);
        mutex_unlock(&register_mutex);

diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 4d5120f..0345e53 100644 (file)
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -1105,11 +1105,9 @@ static int snd_pcm_dev_register(struct snd_device *device)
                        break;
                }
                /* register pcm */
-               err = snd_register_device_for_dev(devtype, pcm->card,
-                                                 pcm->device,
-                                                 &snd_pcm_f_ops[cidx],
-                                                 pcm, &pcm->streams[cidx].dev,
-                                                 NULL, NULL);
+               err = snd_register_device(devtype, pcm->card, pcm->device,
+                                         &snd_pcm_f_ops[cidx], pcm,
+                                         &pcm->streams[cidx].dev);
                if (err < 0) {
                        list_del(&pcm->list);
                        mutex_unlock(&register_mutex);
@@ -1132,7 +1130,7 @@ static int snd_pcm_dev_disconnect(struct snd_device *device)
        struct snd_pcm *pcm = device->device_data;
        struct snd_pcm_notify *notify;
        struct snd_pcm_substream *substream;
-       int cidx, devtype;
+       int cidx;
 
        mutex_lock(&register_mutex);
        if (list_empty(&pcm->list))
@@ -1155,16 +1153,7 @@ static int snd_pcm_dev_disconnect(struct snd_device *device)
                notify->n_disconnect(pcm);
        }
        for (cidx = 0; cidx < 2; cidx++) {
-               devtype = -1;
-               switch (cidx) {
-               case SNDRV_PCM_STREAM_PLAYBACK:
-                       devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
-                       break;
-               case SNDRV_PCM_STREAM_CAPTURE:
-                       devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
-                       break;
-               }
-               snd_unregister_device(devtype, pcm->card, pcm->device);
+               snd_unregister_device(&pcm->streams[cidx].dev);
                if (pcm->streams[cidx].chmap_kctl) {
                        snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
                        pcm->streams[cidx].chmap_kctl = NULL;

diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index bccbf7e..b5a7485 100644 (file)
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -1581,10 +1581,9 @@ static int snd_rawmidi_dev_register(struct snd_device *device)
                return -EBUSY;
        }
        list_add_tail(&rmidi->list, &snd_rawmidi_devices);
-       err = snd_register_device_for_dev(SNDRV_DEVICE_TYPE_RAWMIDI,
-                                         rmidi->card, rmidi->device,
-                                         &snd_rawmidi_f_ops, rmidi,
-                                         &rmidi->dev, NULL, NULL);
+       err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
+                                 rmidi->card, rmidi->device,
+                                 &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
        if (err < 0) {
                rmidi_err(rmidi, "unable to register\n");
                list_del(&rmidi->list);
@@ -1593,7 +1592,7 @@ static int snd_rawmidi_dev_register(struct snd_device *device)
        }
        if (rmidi->ops && rmidi->ops->dev_register &&
            (err = rmidi->ops->dev_register(rmidi)) < 0) {
-               snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
+               snd_unregister_device(&rmidi->dev);
                list_del(&rmidi->list);
                mutex_unlock(&register_mutex);
                return err;
@@ -1681,7 +1680,7 @@ static int snd_rawmidi_dev_disconnect(struct snd_device *device)
                rmidi->ossreg = 0;
        }
 #endif /* CONFIG_SND_OSSEMUL */
-       snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
+       snd_unregister_device(&rmidi->dev);
        mutex_unlock(&rmidi->open_mutex);
        mutex_unlock(&register_mutex);
        return 0;

diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index 65b320e..2b62cd0 100644 (file)
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -2586,9 +2586,8 @@ int __init snd_sequencer_device_init(void)
        if (mutex_lock_interruptible(&register_mutex))
                return -ERESTARTSYS;
 
-       err = snd_register_device_for_dev(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
-                                         &snd_seq_f_ops, NULL,
-                                         &seq_dev, NULL, NULL);
+       err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
+                                 &snd_seq_f_ops, NULL, &seq_dev);
        if (err < 0) {
                mutex_unlock(&register_mutex);
                put_device(&seq_dev);
@@ -2607,6 +2606,6 @@ int __init snd_sequencer_device_init(void)
  */
 void __exit snd_sequencer_device_done(void)
 {
-       snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
+       snd_unregister_device(&seq_dev);
        put_device(&seq_dev);
 }

diff --git a/sound/core/sound.c b/sound/core/sound.c
index ea1af1a..2e8aeb1 100644 (file)
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -242,30 +242,30 @@ static int snd_kernel_minor(int type, struct snd_card *card, int dev)
 #endif
 
 /**
- * snd_register_device_for_dev - Register the ALSA device file for the card
+ * snd_register_device - Register the ALSA device file for the card
  * @type: the device type, SNDRV_DEVICE_TYPE_XXX
  * @card: the card instance
  * @dev: the device index
  * @f_ops: the file operations
  * @private_data: user pointer for f_ops->open()
- * @device: the device to register, NULL to create a new one
- * @parent: the &struct device to link this new device to (only for device=NULL)
- * @name: the device file name (only for device=NULL)
+ * @device: the device to register
  *
  * Registers an ALSA device file for the given card.
  * The operators have to be set in reg parameter.
  *
  * Return: Zero if successful, or a negative error code on failure.
  */
-int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
-                               const struct file_operations *f_ops,
-                               void *private_data, struct device *device,
-                               struct device *parent, const char *name)
+int snd_register_device(int type, struct snd_card *card, int dev,
+                       const struct file_operations *f_ops,
+                       void *private_data, struct device *device)
 {
        int minor;
        int err = 0;
        struct snd_minor *preg;
 
+       if (snd_BUG_ON(!device))
+               return -EINVAL;
+
        preg = kmalloc(sizeof *preg, GFP_KERNEL);
        if (preg == NULL)
                return -ENOMEM;
@@ -288,19 +288,9 @@ int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
                goto error;
        }
 
-       if (device) {
-               preg->created = false;
-               preg->dev = device;
-               device->devt = MKDEV(major, minor);
-               err = device_add(device);
-       } else {
-               preg->created = true;
-               preg->dev = device_create(sound_class, parent,
-                                         MKDEV(major, minor), private_data,
-                                         "%s", name);
-               if (IS_ERR(preg->dev))
-                       err = PTR_ERR(preg->dev);
-       }
+       preg->dev = device;
+       device->devt = MKDEV(major, minor);
+       err = device_add(device);
        if (err < 0)
                goto error;
 
@@ -311,8 +301,7 @@ int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
                kfree(preg);
        return err;
 }
-
-EXPORT_SYMBOL(snd_register_device_for_dev);
+EXPORT_SYMBOL(snd_register_device);
 
 /* find the matching minor record
  * return the index of snd_minor, or -1 if not found
@@ -334,39 +323,33 @@ static int find_snd_minor(int type, struct snd_card *card, int dev)
 
 /**
  * snd_unregister_device - unregister the device on the given card
- * @type: the device type, SNDRV_DEVICE_TYPE_XXX
- * @card: the card instance
- * @dev: the device index
+ * @dev: the device instance
  *
  * Unregisters the device file already registered via
  * snd_register_device().
  *
  * Return: Zero if successful, or a negative error code on failure.
  */
-int snd_unregister_device(int type, struct snd_card *card, int dev)
+int snd_unregister_device(struct device *dev)
 {
        int minor;
        struct snd_minor *preg;
 
        mutex_lock(&sound_mutex);
-       minor = find_snd_minor(type, card, dev);
-       if (minor < 0) {
-               mutex_unlock(&sound_mutex);
-               return -EINVAL;
+       for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
+               preg = snd_minors[minor];
+               if (preg && preg->dev == dev) {
+                       snd_minors[minor] = NULL;
+                       device_del(dev);
+                       kfree(preg);
+                       break;
+               }
        }
-
-       preg = snd_minors[minor];
-       if (preg && !preg->created)
-               device_del(preg->dev);
-       else
-               device_destroy(sound_class, MKDEV(major, minor));
-
-       kfree(snd_minors[minor]);
-       snd_minors[minor] = NULL;
        mutex_unlock(&sound_mutex);
+       if (minor >= ARRAY_SIZE(snd_minors))
+               return -ENOENT;
        return 0;
 }
-
 EXPORT_SYMBOL(snd_unregister_device);
 
 /**

diff --git a/sound/core/timer.c b/sound/core/timer.c
index dae40ac..9f0c703 100644 (file)
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1976,9 +1976,8 @@ static int __init alsa_timer_init(void)
                return err;
        }
 
-       err = snd_register_device_for_dev(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
-                                         &snd_timer_f_ops, NULL,
-                                         &timer_dev, NULL, NULL);
+       err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
+                                 &snd_timer_f_ops, NULL, &timer_dev);
        if (err < 0) {
                pr_err("ALSA: unable to register timer device (%i)\n", err);
                snd_timer_free_all();
@@ -1992,7 +1991,7 @@ static int __init alsa_timer_init(void)
 
 static void __exit alsa_timer_exit(void)
 {
-       snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0);
+       snd_unregister_device(&timer_dev);
        snd_timer_free_all();
        put_device(&timer_dev);
        snd_timer_proc_done();