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[ALSA] Fix disconnection of proc interface 

- Add the linked list to each proc entry to enable a single-shot
  disconnection (unregister)
- Deprecate snd_info_unregister(), use snd_info_free_entry()
- Removed NULL checks of snd_info_free_entry()

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Takashi Iwai 2006-06-23 14:37:59 +02:00 committed by Jaroslav Kysela
parent 42750b04c5
commit 746d4a02e6
21 changed files with 123 additions and 172 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/sound/info.h
View File

@ -71,7 +71,6 @@ struct snd_info_entry {
mode_t mode;
long size;
unsigned short content;
unsigned short disconnected: 1;
union {
struct snd_info_entry_text text;
struct snd_info_entry_ops *ops;
@ -83,6 +82,8 @@ struct snd_info_entry {
void (*private_free)(struct snd_info_entry *entry);
struct proc_dir_entry *p;
struct mutex access;
struct list_head children;
struct list_head list;
};
#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
@ -122,8 +123,8 @@ int snd_info_restore_text(struct snd_info_entry * entry);
int snd_info_card_create(struct snd_card * card);
int snd_info_card_register(struct snd_card * card);
int snd_info_card_free(struct snd_card * card);
void snd_info_card_disconnect(struct snd_card * card);
int snd_info_register(struct snd_info_entry * entry);
int snd_info_unregister(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);
@ -156,8 +157,8 @@ static inline void snd_info_free_entry(struct snd_info_entry * entry) { ; }
static inline int snd_info_card_create(struct snd_card * card) { return 0; }
static inline int snd_info_card_register(struct snd_card * card) { return 0; }
static inline int snd_info_card_free(struct snd_card * card) { return 0; }
static inline void snd_info_card_disconnect(struct snd_card * card) { }
static inline int snd_info_register(struct snd_info_entry * entry) { return 0; }
static inline int snd_info_unregister(struct snd_info_entry * entry) { return 0; }
static inline int snd_card_proc_new(struct snd_card *card, const char *name,
struct snd_info_entry **entryp) { return -EINVAL; }

2
sound/core/hwdep.c
View File

@ -497,7 +497,7 @@ static void __init snd_hwdep_proc_init(void)
static void __exit snd_hwdep_proc_done(void)
{
snd_info_unregister(snd_hwdep_proc_entry);
snd_info_free_entry(snd_hwdep_proc_entry);
}
#else /* !CONFIG_PROC_FS */
#define snd_hwdep_proc_init()

102
sound/core/info.c
View File

@ -78,6 +78,7 @@ struct snd_info_private_data {
static int snd_info_version_init(void);
static int snd_info_version_done(void);
static void snd_info_disconnect(struct snd_info_entry *entry);
/* resize the proc r/w buffer */
@ -304,7 +305,7 @@ static int snd_info_entry_open(struct inode *inode, struct file *file)
mutex_lock(&info_mutex);
p = PDE(inode);
entry = p == NULL ? NULL : (struct snd_info_entry *)p->data;
if (entry == NULL || entry->disconnected) {
if (entry == NULL || ! entry->p) {
mutex_unlock(&info_mutex);
return -ENODEV;
}
@ -586,10 +587,10 @@ int __exit snd_info_done(void)
snd_info_version_done();
if (snd_proc_root) {
#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
snd_info_unregister(snd_seq_root);
snd_info_free_entry(snd_seq_root);
#endif
#ifdef CONFIG_SND_OSSEMUL
snd_info_unregister(snd_oss_root);
snd_info_free_entry(snd_oss_root);
#endif
snd_remove_proc_entry(&proc_root, snd_proc_root);
}
@ -648,17 +649,28 @@ int snd_info_card_register(struct snd_card *card)
* de-register the card proc file
* called from init.c
*/
int snd_info_card_free(struct snd_card *card)
void snd_info_card_disconnect(struct snd_card *card)
{
snd_assert(card != NULL, return -ENXIO);
snd_assert(card != NULL, return);
mutex_lock(&info_mutex);
if (card->proc_root_link) {
snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
card->proc_root_link = NULL;
}
if (card->proc_root) {
snd_info_unregister(card->proc_root);
card->proc_root = NULL;
}
if (card->proc_root)
snd_info_disconnect(card->proc_root);
mutex_unlock(&info_mutex);
}
/*
* release the card proc file resources
* called from init.c
*/
int snd_info_card_free(struct snd_card *card)
{
snd_assert(card != NULL, return -ENXIO);
snd_info_free_entry(card->proc_root);
card->proc_root = NULL;
return 0;
}
@ -767,6 +779,8 @@ static struct snd_info_entry *snd_info_create_entry(const char *name)
entry->mode = S_IFREG | S_IRUGO;
entry->content = SNDRV_INFO_CONTENT_TEXT;
mutex_init(&entry->access);
INIT_LIST_HEAD(&entry->children);
INIT_LIST_HEAD(&entry->list);
return entry;
}
@ -819,6 +833,24 @@ struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
EXPORT_SYMBOL(snd_info_create_card_entry);
static void snd_info_disconnect(struct snd_info_entry *entry)
{
struct list_head *p, *n;
struct proc_dir_entry *root;
list_for_each_safe(p, n, &entry->children) {
snd_info_disconnect(list_entry(p, struct snd_info_entry, list));
}
if (! entry->p)
return;
list_del_init(&entry->list);
root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
snd_assert(root, return);
snd_remove_proc_entry(root, entry->p);
entry->p = NULL;
}
static int snd_info_dev_free_entry(struct snd_device *device)
{
struct snd_info_entry *entry = device->device_data;
@ -832,19 +864,6 @@ static int snd_info_dev_register_entry(struct snd_device *device)
return snd_info_register(entry);
}
static int snd_info_dev_disconnect_entry(struct snd_device *device)
{
struct snd_info_entry *entry = device->device_data;
entry->disconnected = 1;
return 0;
}
static int snd_info_dev_unregister_entry(struct snd_device *device)
{
struct snd_info_entry *entry = device->device_data;
return snd_info_unregister(entry);
}
/**
* snd_card_proc_new - create an info entry for the given card
* @card: the card instance
@ -871,8 +890,7 @@ int snd_card_proc_new(struct snd_card *card, const char *name,
static struct snd_device_ops ops = {
.dev_free = snd_info_dev_free_entry,
.dev_register = snd_info_dev_register_entry,
.dev_disconnect = snd_info_dev_disconnect_entry,
.dev_unregister = snd_info_dev_unregister_entry
/* disconnect is done via snd_info_card_disconnect() */
};
struct snd_info_entry *entry;
int err;
@ -901,6 +919,11 @@ void snd_info_free_entry(struct snd_info_entry * entry)
{
if (entry == NULL)
return;
if (entry->p) {
mutex_lock(&info_mutex);
snd_info_disconnect(entry);
mutex_unlock(&info_mutex);
}
kfree(entry->name);
if (entry->private_free)
entry->private_free(entry);
@ -935,38 +958,14 @@ int snd_info_register(struct snd_info_entry * entry)
p->size = entry->size;
p->data = entry;
entry->p = p;
if (entry->parent)
list_add_tail(&entry->list, &entry->parent->children);
mutex_unlock(&info_mutex);
return 0;
}
EXPORT_SYMBOL(snd_info_register);
/**
* snd_info_unregister - de-register the info entry
* @entry: the info entry
*
* De-registers the info entry and releases the instance.
*
* Returns zero if successful, or a negative error code on failure.
*/
int snd_info_unregister(struct snd_info_entry * entry)
{
struct proc_dir_entry *root;
if (! entry)
return 0;
snd_assert(entry->p != NULL, return -ENXIO);
root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
snd_assert(root, return -ENXIO);
mutex_lock(&info_mutex);
snd_remove_proc_entry(root, entry->p);
mutex_unlock(&info_mutex);
snd_info_free_entry(entry);
return 0;
}
EXPORT_SYMBOL(snd_info_unregister);
/*
*/
@ -999,8 +998,7 @@ static int __init snd_info_version_init(void)
static int __exit snd_info_version_done(void)
{
if (snd_info_version_entry)
snd_info_unregister(snd_info_version_entry);
snd_info_free_entry(snd_info_version_entry);
return 0;
}

6
sound/core/info_oss.c
View File

@ -131,10 +131,8 @@ int snd_info_minor_register(void)
int snd_info_minor_unregister(void)
{
if (snd_sndstat_proc_entry) {
snd_info_unregister(snd_sndstat_proc_entry);
snd_sndstat_proc_entry = NULL;
}
snd_info_free_entry(snd_sndstat_proc_entry);
snd_sndstat_proc_entry = NULL;
return 0;
}

7
sound/core/init.c
View File

@ -310,6 +310,7 @@ int snd_card_disconnect(struct snd_card *card)
if (err < 0)
snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number);
snd_info_card_disconnect(card);
return 0;
}
@ -360,7 +361,7 @@ int snd_card_free(struct snd_card *card)
}
if (card->private_free)
card->private_free(card);
snd_info_unregister(card->proc_id);
snd_info_free_entry(card->proc_id);
if (snd_info_card_free(card) < 0) {
snd_printk(KERN_WARNING "unable to free card info\n");
/* Not fatal error */
@ -625,9 +626,9 @@ int __init snd_card_info_init(void)
int __exit snd_card_info_done(void)
{
snd_info_unregister(snd_card_info_entry);
snd_info_free_entry(snd_card_info_entry);
#ifdef MODULE
snd_info_unregister(snd_card_module_info_entry);
snd_info_free_entry(snd_card_module_info_entry);
#endif
return 0;
}

6
sound/core/oss/mixer_oss.c
View File

@ -1193,10 +1193,8 @@ static void snd_mixer_oss_proc_init(struct snd_mixer_oss *mixer)
static void snd_mixer_oss_proc_done(struct snd_mixer_oss *mixer)
{
if (mixer->proc_entry) {
snd_info_unregister(mixer->proc_entry);
mixer->proc_entry = NULL;
}
snd_info_free_entry(mixer->proc_entry);
mixer->proc_entry = NULL;
}
#else /* !CONFIG_PROC_FS */
#define snd_mixer_oss_proc_init(mix)

8
sound/core/oss/pcm_oss.c
View File

@ -2846,11 +2846,9 @@ static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
int stream;
for (stream = 0; stream < 2; ++stream) {
struct snd_pcm_str *pstr = &pcm->streams[stream];
if (pstr->oss.proc_entry) {
snd_info_unregister(pstr->oss.proc_entry);
pstr->oss.proc_entry = NULL;
snd_pcm_oss_proc_free_setup_list(pstr);
}
snd_info_free_entry(pstr->oss.proc_entry);
pstr->oss.proc_entry = NULL;
snd_pcm_oss_proc_free_setup_list(pstr);
}
}
#else /* !CONFIG_SND_VERBOSE_PROCFS */

53
sound/core/pcm.c
View File

@ -494,19 +494,13 @@ static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
{
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
if (pstr->proc_xrun_debug_entry) {
snd_info_unregister(pstr->proc_xrun_debug_entry);
pstr->proc_xrun_debug_entry = NULL;
}
snd_info_free_entry(pstr->proc_xrun_debug_entry);
pstr->proc_xrun_debug_entry = NULL;
#endif
if (pstr->proc_info_entry) {
snd_info_unregister(pstr->proc_info_entry);
pstr->proc_info_entry = NULL;
}
if (pstr->proc_root) {
snd_info_unregister(pstr->proc_root);
pstr->proc_root = NULL;
}
snd_info_free_entry(pstr->proc_info_entry);
pstr->proc_info_entry = NULL;
snd_info_free_entry(pstr->proc_root);
pstr->proc_root = NULL;
return 0;
}
@ -570,29 +564,19 @@ static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
return 0;
}
static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
{
if (substream->proc_info_entry) {
snd_info_unregister(substream->proc_info_entry);
substream->proc_info_entry = NULL;
}
if (substream->proc_hw_params_entry) {
snd_info_unregister(substream->proc_hw_params_entry);
substream->proc_hw_params_entry = NULL;
}
if (substream->proc_sw_params_entry) {
snd_info_unregister(substream->proc_sw_params_entry);
substream->proc_sw_params_entry = NULL;
}
if (substream->proc_status_entry) {
snd_info_unregister(substream->proc_status_entry);
substream->proc_status_entry = NULL;
}
if (substream->proc_root) {
snd_info_unregister(substream->proc_root);
substream->proc_root = NULL;
}
snd_info_free_entry(substream->proc_info_entry);
substream->proc_info_entry = NULL;
snd_info_free_entry(substream->proc_hw_params_entry);
substream->proc_hw_params_entry = NULL;
snd_info_free_entry(substream->proc_sw_params_entry);
substream->proc_sw_params_entry = NULL;
snd_info_free_entry(substream->proc_status_entry);
substream->proc_status_entry = NULL;
snd_info_free_entry(substream->proc_root);
substream->proc_root = NULL;
return 0;
}
#else /* !CONFIG_SND_VERBOSE_PROCFS */
@ -1090,8 +1074,7 @@ static void snd_pcm_proc_init(void)
static void snd_pcm_proc_done(void)
{
if (snd_pcm_proc_entry)
snd_info_unregister(snd_pcm_proc_entry);
snd_info_free_entry(snd_pcm_proc_entry);
}
#else /* !CONFIG_PROC_FS */

2
sound/core/pcm_memory.c
View File

@ -101,7 +101,7 @@ int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream)
{
snd_pcm_lib_preallocate_dma_free(substream);
#ifdef CONFIG_SND_VERBOSE_PROCFS
snd_info_unregister(substream->proc_prealloc_entry);
snd_info_free_entry(substream->proc_prealloc_entry);
substream->proc_prealloc_entry = NULL;
#endif
return 0;

2
sound/core/rawmidi.c
View File

@ -1599,7 +1599,7 @@ static int snd_rawmidi_dev_unregister(struct snd_device *device)
mutex_lock(&register_mutex);
list_del(&rmidi->list);
if (rmidi->proc_entry) {
snd_info_unregister(rmidi->proc_entry);
snd_info_free_entry(rmidi->proc_entry);
rmidi->proc_entry = NULL;
}
#ifdef CONFIG_SND_OSSEMUL

3
sound/core/seq/oss/seq_oss.c
View File

@ -303,8 +303,7 @@ register_proc(void)
static void
unregister_proc(void)
{
if (info_entry)
snd_info_unregister(info_entry);
snd_info_free_entry(info_entry);
info_entry = NULL;
}
#endif /* CONFIG_PROC_FS */

2
sound/core/seq/seq_device.c
View File

@ -573,7 +573,7 @@ static void __exit alsa_seq_device_exit(void)
{
remove_drivers();
#ifdef CONFIG_PROC_FS
snd_info_unregister(info_entry);
snd_info_free_entry(info_entry);
#endif
if (num_ops)
snd_printk(KERN_ERR "drivers not released (%d)\n", num_ops);

6
sound/core/seq/seq_info.c
View File

@ -64,9 +64,9 @@ int __init snd_seq_info_init(void)
int __exit snd_seq_info_done(void)
{
snd_info_unregister(queues_entry);
snd_info_unregister(clients_entry);
snd_info_unregister(timer_entry);
snd_info_free_entry(queues_entry);
snd_info_free_entry(clients_entry);
snd_info_free_entry(timer_entry);
return 0;
}
#endif

3
sound/core/sound.c
View File

@ -387,8 +387,7 @@ int __init snd_minor_info_init(void)
int __exit snd_minor_info_done(void)
{
if (snd_minor_info_entry)
snd_info_unregister(snd_minor_info_entry);
snd_info_free_entry(snd_minor_info_entry);
return 0;
}
#endif /* CONFIG_PROC_FS */

3
sound/core/sound_oss.c
View File

@ -270,8 +270,7 @@ int __init snd_minor_info_oss_init(void)
int __exit snd_minor_info_oss_done(void)
{
if (snd_minor_info_oss_entry)
snd_info_unregister(snd_minor_info_oss_entry);
snd_info_free_entry(snd_minor_info_oss_entry);
return 0;
}
#endif /* CONFIG_PROC_FS */

2
sound/core/timer.c
View File

@ -1126,7 +1126,7 @@ static void __init snd_timer_proc_init(void)
static void __exit snd_timer_proc_done(void)
{
snd_info_unregister(snd_timer_proc_entry);
snd_info_free_entry(snd_timer_proc_entry);
}
#else /* !CONFIG_PROC_FS */
#define snd_timer_proc_init()

3
sound/drivers/opl4/opl4_proc.c
View File

@ -159,8 +159,7 @@ int snd_opl4_create_proc(struct snd_opl4 *opl4)
void snd_opl4_free_proc(struct snd_opl4 *opl4)
{
if (opl4->proc_entry)
snd_info_unregister(opl4->proc_entry);
snd_info_free_entry(opl4->proc_entry);
}
#endif /* CONFIG_PROC_FS */

18
sound/pci/ac97/ac97_proc.c
View File

@ -457,14 +457,10 @@ void snd_ac97_proc_init(struct snd_ac97 * ac97)
void snd_ac97_proc_done(struct snd_ac97 * ac97)
{
if (ac97->proc_regs) {
snd_info_unregister(ac97->proc_regs);
ac97->proc_regs = NULL;
}
if (ac97->proc) {
snd_info_unregister(ac97->proc);
ac97->proc = NULL;
}
snd_info_free_entry(ac97->proc_regs);
ac97->proc_regs = NULL;
snd_info_free_entry(ac97->proc);
ac97->proc = NULL;
}
void snd_ac97_bus_proc_init(struct snd_ac97_bus * bus)
@ -485,8 +481,6 @@ void snd_ac97_bus_proc_init(struct snd_ac97_bus * bus)
void snd_ac97_bus_proc_done(struct snd_ac97_bus * bus)
{
if (bus->proc) {
snd_info_unregister(bus->proc);
bus->proc = NULL;
}
snd_info_free_entry(bus->proc);
bus->proc = NULL;
}

52
sound/pci/cs46xx/dsp_spos.c
View File

@ -868,35 +868,23 @@ int cs46xx_dsp_proc_done (struct snd_cs46xx *chip)
struct dsp_spos_instance * ins = chip->dsp_spos_instance;
int i;
if (ins->proc_sym_info_entry) {
snd_info_unregister(ins->proc_sym_info_entry);
ins->proc_sym_info_entry = NULL;
}
if (ins->proc_modules_info_entry) {
snd_info_unregister(ins->proc_modules_info_entry);
ins->proc_modules_info_entry = NULL;
}
if (ins->proc_parameter_dump_info_entry) {
snd_info_unregister(ins->proc_parameter_dump_info_entry);
ins->proc_parameter_dump_info_entry = NULL;
}
if (ins->proc_sample_dump_info_entry) {
snd_info_unregister(ins->proc_sample_dump_info_entry);
ins->proc_sample_dump_info_entry = NULL;
}
if (ins->proc_scb_info_entry) {
snd_info_unregister(ins->proc_scb_info_entry);
ins->proc_scb_info_entry = NULL;
}
if (ins->proc_task_info_entry) {
snd_info_unregister(ins->proc_task_info_entry);
ins->proc_task_info_entry = NULL;
}
snd_info_free_entry(ins->proc_sym_info_entry);
ins->proc_sym_info_entry = NULL;
snd_info_free_entry(ins->proc_modules_info_entry);
ins->proc_modules_info_entry = NULL;
snd_info_free_entry(ins->proc_parameter_dump_info_entry);
ins->proc_parameter_dump_info_entry = NULL;
snd_info_free_entry(ins->proc_sample_dump_info_entry);
ins->proc_sample_dump_info_entry = NULL;
snd_info_free_entry(ins->proc_scb_info_entry);
ins->proc_scb_info_entry = NULL;
snd_info_free_entry(ins->proc_task_info_entry);
ins->proc_task_info_entry = NULL;
mutex_lock(&chip->spos_mutex);
for (i = 0; i < ins->nscb; ++i) {
@ -905,10 +893,8 @@ int cs46xx_dsp_proc_done (struct snd_cs46xx *chip)
}
mutex_unlock(&chip->spos_mutex);
if (ins->proc_dsp_dir) {
snd_info_unregister (ins->proc_dsp_dir);
ins->proc_dsp_dir = NULL;
}
snd_info_free_entry(ins->proc_dsp_dir);
ins->proc_dsp_dir = NULL;
return 0;
}

2
sound/pci/cs46xx/dsp_spos_scb_lib.c
View File

@ -233,7 +233,7 @@ void cs46xx_dsp_proc_free_scb_desc (struct dsp_scb_descriptor * scb)
snd_printdd("cs46xx_dsp_proc_free_scb_desc: freeing %s\n",scb->scb_name);
snd_info_unregister(scb->proc_info);
snd_info_free_entry(scb->proc_info);
scb->proc_info = NULL;
snd_assert (scb_info != NULL, return);

6
sound/synth/emux/emux_proc.c
View File

@ -128,10 +128,8 @@ void snd_emux_proc_init(struct snd_emux *emu, struct snd_card *card, int device)
void snd_emux_proc_free(struct snd_emux *emu)
{
if (emu->proc) {
snd_info_unregister(emu->proc);
emu->proc = NULL;
}
snd_info_free_entry(emu->proc);
emu->proc = NULL;
}
#endif /* CONFIG_PROC_FS */