[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>

include/sound/info.h

@@ -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; }

sound/core/hwdep.c

@@ -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()

sound/core/info.c

@@ -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;
 }
 
@@ -819,30 +833,35 @@ struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
 
 EXPORT_SYMBOL(snd_info_create_card_entry);
 
-static int snd_info_dev_free_entry(struct snd_device *device)
+static void snd_info_disconnect(struct snd_info_entry *entry)
 {
-	struct snd_info_entry *entry = device->device_data;
-	snd_info_free_entry(entry);
-	return 0;
-}
+	struct list_head *p, *n;
+	struct proc_dir_entry *root;
 
-static int snd_info_dev_register_entry(struct snd_device *device)
-{
-	struct snd_info_entry *entry = device->device_data;
-	return snd_info_register(entry);
+	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_disconnect_entry(struct snd_device *device)
+static int snd_info_dev_free_entry(struct snd_device *device)
 {
 	struct snd_info_entry *entry = device->device_data;
-	entry->disconnected = 1;
+	snd_info_free_entry(entry);
 	return 0;
 }
 
-static int snd_info_dev_unregister_entry(struct snd_device *device)
+static int snd_info_dev_register_entry(struct snd_device *device)
 {
 	struct snd_info_entry *entry = device->device_data;
-	return snd_info_unregister(entry);
+	return snd_info_register(entry);
 }
 
 /**
@@ -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;
 }
 

sound/core/info_oss.c

@@ -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;
 }
 

sound/core/init.c

@@ -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;
 }

sound/core/oss/mixer_oss.c

@@ -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)

sound/core/oss/pcm_oss.c

@@ -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 */

sound/core/pcm.c

@@ -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 */

sound/core/pcm_memory.c

@@ -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;

sound/core/rawmidi.c

@@ -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

sound/core/seq/oss/seq_oss.c

@@ -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 */

sound/core/seq/seq_device.c

@@ -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);

sound/core/seq/seq_info.c

@@ -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

sound/core/sound.c

@@ -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 */

sound/core/sound_oss.c

@@ -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 */

sound/core/timer.c

@@ -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()

sound/drivers/opl4/opl4_proc.c

@@ -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 */

sound/pci/ac97/ac97_proc.c

@@ -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;
 }

sound/pci/cs46xx/dsp_spos.c

@@ -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;
 }

sound/pci/cs46xx/dsp_spos_scb_lib.c

@@ -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);

sound/synth/emux/emux_proc.c

@@ -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 */