[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>
diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
index 8bd0dcc..cbd8a63 100644
--- a/sound/core/hwdep.c
+++ b/sound/core/hwdep.c
@@ -497,7 +497,7 @@
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()
diff --git a/sound/core/info.c b/sound/core/info.c
index 340332c..9663b6b 100644
--- a/sound/core/info.c
+++ b/sound/core/info.c
@@ -78,6 +78,7 @@
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 @@
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 @@
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 @@
* 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 @@
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 @@
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 @@
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 @@
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 @@
{
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 @@
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 __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;
}
diff --git a/sound/core/info_oss.c b/sound/core/info_oss.c
index bb2c40d..3ebc349 100644
--- a/sound/core/info_oss.c
+++ b/sound/core/info_oss.c
@@ -131,10 +131,8 @@
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;
}
diff --git a/sound/core/init.c b/sound/core/init.c
index 4d92588..1ecb029 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -310,6 +310,7 @@
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 @@
}
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 __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;
}
diff --git a/sound/core/oss/mixer_oss.c b/sound/core/oss/mixer_oss.c
index 75a9505..00c95de 100644
--- a/sound/core/oss/mixer_oss.c
+++ b/sound/core/oss/mixer_oss.c
@@ -1193,10 +1193,8 @@
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)
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index 472fce0..a92b93e 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -2846,11 +2846,9 @@
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 */
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 7581edd..b860247 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -494,19 +494,13 @@
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 @@
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_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 */
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index 067d205..be030cb 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -101,7 +101,7 @@
{
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;
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 8c15c66..51577c2 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -1599,7 +1599,7 @@
mutex_lock(®ister_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
diff --git a/sound/core/seq/oss/seq_oss.c b/sound/core/seq/oss/seq_oss.c
index e723413..92858cf 100644
--- a/sound/core/seq/oss/seq_oss.c
+++ b/sound/core/seq/oss/seq_oss.c
@@ -303,8 +303,7 @@
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 */
diff --git a/sound/core/seq/seq_device.c b/sound/core/seq/seq_device.c
index 102ff54..b85954e 100644
--- a/sound/core/seq/seq_device.c
+++ b/sound/core/seq/seq_device.c
@@ -573,7 +573,7 @@
{
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);
diff --git a/sound/core/seq/seq_info.c b/sound/core/seq/seq_info.c
index 142e9e6..8a7fe5c 100644
--- a/sound/core/seq/seq_info.c
+++ b/sound/core/seq/seq_info.c
@@ -64,9 +64,9 @@
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
diff --git a/sound/core/sound.c b/sound/core/sound.c
index 7edd1fc..b4430db 100644
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -387,8 +387,7 @@
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 */
diff --git a/sound/core/sound_oss.c b/sound/core/sound_oss.c
index 74f0fe5..b2fc40a 100644
--- a/sound/core/sound_oss.c
+++ b/sound/core/sound_oss.c
@@ -270,8 +270,7 @@
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 */
diff --git a/sound/core/timer.c b/sound/core/timer.c
index 0a984e8..52ecbe1 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1126,7 +1126,7 @@
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()
