ALSA: control: Rename ctl_files_rwlock to controls_rwlock

We'll re-use the existing rwlock for the protection of control list
lookup, too, and now rename it to a more generic name.

This is a preliminary change, only the rename of the struct field
here, no functional changes.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20240809104234.8488-2-tiwai@suse.de

include/sound/core.h

@@ -99,7 +99,7 @@ struct snd_card {
 	struct device *ctl_dev;		/* control device */
 	unsigned int last_numid;	/* last used numeric ID */
 	struct rw_semaphore controls_rwsem;	/* controls lock (list and values) */
-	rwlock_t ctl_files_rwlock;	/* ctl_files list lock */
+	rwlock_t controls_rwlock;	/* lock for ctl_files list */
 	int controls_count;		/* count of all controls */
 	size_t user_ctl_alloc_size;	// current memory allocation by user controls.
 	struct list_head controls;	/* all controls for this card */

sound/core/control.c

@@ -79,7 +79,7 @@ static int snd_ctl_open(struct inode *inode, struct file *file)
 		ctl->preferred_subdevice[i] = -1;
 	ctl->pid = get_pid(task_pid(current));
 	file->private_data = ctl;
-	scoped_guard(write_lock_irqsave, &card->ctl_files_rwlock)
+	scoped_guard(write_lock_irqsave, &card->controls_rwlock)
 		list_add_tail(&ctl->list, &card->ctl_files);
 	snd_card_unref(card);
 	return 0;
@@ -117,7 +117,7 @@ static int snd_ctl_release(struct inode *inode, struct file *file)
 	file->private_data = NULL;
 	card = ctl->card;
 
-	scoped_guard(write_lock_irqsave, &card->ctl_files_rwlock)
+	scoped_guard(write_lock_irqsave, &card->controls_rwlock)
 		list_del(&ctl->list);
 
 	scoped_guard(rwsem_write, &card->controls_rwsem) {
@@ -157,7 +157,7 @@ void snd_ctl_notify(struct snd_card *card, unsigned int mask,
 	if (card->shutdown)
 		return;
 
-	guard(read_lock_irqsave)(&card->ctl_files_rwlock);
+	guard(read_lock_irqsave)(&card->controls_rwlock);
 #if IS_ENABLED(CONFIG_SND_MIXER_OSS)
 	card->mixer_oss_change_count++;
 #endif
@@ -2178,7 +2178,7 @@ int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type)
 	struct snd_ctl_file *kctl;
 	int subdevice = -1;
 
-	guard(read_lock_irqsave)(&card->ctl_files_rwlock);
+	guard(read_lock_irqsave)(&card->controls_rwlock);
 	list_for_each_entry(kctl, &card->ctl_files, list) {
 		if (kctl->pid == task_pid(current)) {
 			subdevice = kctl->preferred_subdevice[type];
@@ -2328,7 +2328,7 @@ static int snd_ctl_dev_disconnect(struct snd_device *device)
 	struct snd_card *card = device->device_data;
 	struct snd_ctl_file *ctl;
 
-	scoped_guard(read_lock_irqsave, &card->ctl_files_rwlock) {
+	scoped_guard(read_lock_irqsave, &card->controls_rwlock) {
 		list_for_each_entry(ctl, &card->ctl_files, list) {
 			wake_up(&ctl->change_sleep);
 			snd_kill_fasync(ctl->fasync, SIGIO, POLL_ERR);

sound/core/init.c

@@ -315,7 +315,7 @@ static int snd_card_init(struct snd_card *card, struct device *parent,
 	card->module = module;
 	INIT_LIST_HEAD(&card->devices);
 	init_rwsem(&card->controls_rwsem);
-	rwlock_init(&card->ctl_files_rwlock);
+	rwlock_init(&card->controls_rwlock);
 	INIT_LIST_HEAD(&card->controls);
 	INIT_LIST_HEAD(&card->ctl_files);
 #ifdef CONFIG_SND_CTL_FAST_LOOKUP