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ALSA: core: Remove child proc file elements recursively

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This patch changes the way to manage the resource release of proc
files: namely, let snd_info_free_entry() freeing the whole children.

This makes it us possible to drop the snd_device_*() management.  Then
snd_card_proc_new() becomes merely a wrapper to
snd_info_create_card_entry().

Together with this change, now you need to call snd_info_free_entry()
for a proc entry created via snd_card_proc_new(), while it was freed
via snd_device_free() beforehand.

Acked-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-04-22 18:26:38 +02:00
parent 886364f679
commit c560a6797e
3 changed files with 21 additions and 69 deletions
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9
include/sound/info.h
View File

@ -24,6 +24,7 @@
#include <linux/poll.h>
#include <linux/seq_file.h>
#include <sound/core.h>
/* buffer for information */
struct snd_info_buffer {
@ -146,8 +147,12 @@ void snd_info_card_id_change(struct snd_card *card);
int snd_info_register(struct snd_info_entry *entry);
/* for card drivers */
int snd_card_proc_new(struct snd_card *card, const char *name,
struct snd_info_entry **entryp);
static inline int snd_card_proc_new(struct snd_card *card, const char *name,
struct snd_info_entry **entryp)
{
*entryp = snd_info_create_card_entry(card, name, card->proc_root);
return *entryp ? 0 : -ENOMEM;
}
static inline void snd_info_set_text_ops(struct snd_info_entry *entry,
void *private_data,

79
sound/core/info.c
View File

@ -760,92 +760,39 @@ EXPORT_SYMBOL(snd_info_create_card_entry);
static void snd_info_disconnect(struct snd_info_entry *entry)
{
struct list_head *p, *n;
struct snd_info_entry *p, *n;
list_for_each_safe(p, n, &entry->children) {
snd_info_disconnect(list_entry(p, struct snd_info_entry, list));
}
if (! entry->p)
if (!entry->p)
return;
list_for_each_entry_safe(p, n, &entry->children, list)
snd_info_disconnect(p);
list_del_init(&entry->list);
proc_remove(entry->p);
entry->p = NULL;
}
static int snd_info_dev_free_entry(struct snd_device *device)
{
struct snd_info_entry *entry = device->device_data;
snd_info_free_entry(entry);
return 0;
}
static int snd_info_dev_register_entry(struct snd_device *device)
{
struct snd_info_entry *entry = device->device_data;
return snd_info_register(entry);
}
/**
* snd_card_proc_new - create an info entry for the given card
* @card: the card instance
* @name: the file name
* @entryp: the pointer to store the new info entry
*
* Creates a new info entry and assigns it to the given card.
* Unlike snd_info_create_card_entry(), this function registers the
* info entry as an ALSA device component, so that it can be
* unregistered/released without explicit call.
* Also, you don't have to register this entry via snd_info_register(),
* since this will be registered by snd_card_register() automatically.
*
* The parent is assumed as card->proc_root.
*
* For releasing this entry, use snd_device_free() instead of
* snd_info_free_entry().
*
* Return: Zero if successful, or a negative error code on failure.
*/
int snd_card_proc_new(struct snd_card *card, const char *name,
struct snd_info_entry **entryp)
{
static struct snd_device_ops ops = {
.dev_free = snd_info_dev_free_entry,
.dev_register = snd_info_dev_register_entry,
/* disconnect is done via snd_info_card_disconnect() */
};
struct snd_info_entry *entry;
int err;
entry = snd_info_create_card_entry(card, name, card->proc_root);
if (! entry)
return -ENOMEM;
if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
snd_info_free_entry(entry);
return err;
}
if (entryp)
*entryp = entry;
return 0;
}
EXPORT_SYMBOL(snd_card_proc_new);
/**
* snd_info_free_entry - release the info entry
* @entry: the info entry
*
* Releases the info entry. Don't call this after registered.
* Releases the info entry.
*/
void snd_info_free_entry(struct snd_info_entry * entry)
{
if (entry == NULL)
struct snd_info_entry *p, *n;
if (!entry)
return;
if (entry->p) {
mutex_lock(&info_mutex);
snd_info_disconnect(entry);
mutex_unlock(&info_mutex);
}
/* free all children at first */
list_for_each_entry_safe(p, n, &entry->children, list)
snd_info_free_entry(p);
kfree(entry->name);
if (entry->private_free)
entry->private_free(entry);

2
sound/pci/hda/patch_hdmi.c
View File

@ -592,7 +592,7 @@ static int eld_proc_new(struct hdmi_spec_per_pin *per_pin, int index)
static void eld_proc_free(struct hdmi_spec_per_pin *per_pin)
{
if (!per_pin->codec->bus->shutdown && per_pin->proc_entry) {
snd_device_free(per_pin->codec->card, per_pin->proc_entry);
snd_info_free_entry(per_pin->proc_entry);
per_pin->proc_entry = NULL;
}
}