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Commit 2471b6c8 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: info: Register proc entries recursively, too 



The commit [c560a679: ALSA: core: Remove child proc file elements
recursively] converted snd_card_proc_new() with the normal
snd_info_*() call and removed snd_device chain for such info
entries. However, it misses one point: the creation of the proc entry
was managed by snd_device chain in the former code, and now it's also
gone, which results in no proc files creation at all.  Mea culpa.

This patch makes snd_info_card_register() creating the all pending
child proc entries in a shot.  Also, since snd_card_register() might
be called multiple times, this function is also changed to be callable
multiple times.

Along with the changes above, now the linked list of snd_info_entry is
added at creation time instead of snd_info_register() for keeping eyes
of pending info entries.

Fixes: c560a679 ('ALSA: core: Remove child proc file elements recursively')
Reported-by: default avatar"Lu, Han" <han.lu@intel.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 90a409aa

sound/core/info.c

+34 −3
Original line number Diff line number Diff line
@@ -515,22 +515,51 @@ int snd_info_card_create(struct snd_card *card) 
	return 0;

}



/* register all pending info entries */

static int snd_info_register_recursive(struct snd_info_entry *entry)

{

	struct snd_info_entry *p;

	int err;



	if (!entry->p) {

		err = snd_info_register(entry);

		if (err < 0)

			return err;

	}



	list_for_each_entry(p, &entry->children, list) {

		err = snd_info_register_recursive(p);

		if (err < 0)

			return err;

	}



	return 0;

}



/*

 * register the card proc file

 * called from init.c

 * can be called multiple times for reinitialization

 */

int snd_info_card_register(struct snd_card *card)

{

	struct proc_dir_entry *p;

	int err;



	if (snd_BUG_ON(!card))

		return -ENXIO;



	err = snd_info_register_recursive(card->proc_root);

	if (err < 0)

		return err;



	if (!strcmp(card->id, card->proc_root->name))

		return 0;



	if (card->proc_root_link)

		return 0;

	p = proc_symlink(card->id, snd_proc_root->p, card->proc_root->name);

	if (p == NULL)

	if (!p)

		return -ENOMEM;

	card->proc_root_link = p;

	return 0;
@@ -705,6 +734,8 @@ struct snd_info_entry *snd_info_create_module_entry(struct module * module, 
	if (entry) {

		entry->module = module;

		entry->parent = parent;

		if (parent)

			list_add_tail(&entry->list, &parent->children);

	}

	return entry;

}
@@ -730,6 +761,8 @@ struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, 
		entry->module = card->module;

		entry->card = card;

		entry->parent = parent;

		if (parent)

			list_add_tail(&entry->list, &parent->children);

	}

	return entry;

}
@@ -816,8 +849,6 @@ int snd_info_register(struct snd_info_entry * entry) 
		proc_set_size(p, entry->size);

	}

	entry->p = p;

	if (entry->parent)

		list_add_tail(&entry->list, &entry->parent->children);

	mutex_unlock(&info_mutex);

	return 0;

}

sound/core/init.c

+6 −12
Original line number Diff line number Diff line
@@ -107,26 +107,20 @@ static void snd_card_id_read(struct snd_info_entry *entry, 
	snd_iprintf(buffer, "%s\n", entry->card->id);

}



static inline int init_info_for_card(struct snd_card *card)

static int init_info_for_card(struct snd_card *card)

{

	int err;

	struct snd_info_entry *entry;



	if ((err = snd_info_card_register(card)) < 0) {

		dev_dbg(card->dev, "unable to create card info\n");

		return err;

	}

	if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) {

	entry = snd_info_create_card_entry(card, "id", card->proc_root);

	if (!entry) {

		dev_dbg(card->dev, "unable to create card entry\n");

		return err;

	}

	entry->c.text.read = snd_card_id_read;

	if (snd_info_register(entry) < 0) {

		snd_info_free_entry(entry);

		entry = NULL;

	}

	card->proc_id = entry;

	return 0;



	return snd_info_card_register(card);

}

#else /* !CONFIG_PROC_FS */

#define init_info_for_card(card)
@@ -756,7 +750,7 @@ int snd_card_register(struct snd_card *card) 
	if (snd_cards[card->number]) {

		/* already registered */

		mutex_unlock(&snd_card_mutex);

		return 0;

		return snd_info_card_register(card); /* register pending info */

	}

	if (*card->id) {

		/* make a unique id name from the given string */