From 00976ad5271999ba06d24319fd1031b178aff832 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Wed, 1 Aug 2018 16:37:02 +0200
Subject: [PATCH] ALSA: seq: Fix leftovers at probe error path

The sequencer core module doesn't call some destructors in the error
path of the init code, which may leave some resources.

This patch mainly fix these leaks by calling the destructors
appropriately at alsa_seq_init().  Also the patch brings a few
cleanups along with it, namely:

- Expand the old "if ((err = xxx) < 0)" coding style
- Get rid of empty seq_queue_init() and its caller
- Change snd_seq_info_done() to void

Last but not least, a couple of functions lose __exit annotation since
they are called also in alsa_seq_init().

No functional changes but minor code cleanups.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/core/seq/seq.c           | 26 ++++++++++++++++----------
 sound/core/seq/seq_clientmgr.c |  2 +-
 sound/core/seq/seq_info.c      | 10 ++--------
 sound/core/seq/seq_info.h      |  6 +++---
 sound/core/seq/seq_queue.c     | 12 +-----------
 sound/core/seq/seq_queue.h     |  3 ---
 6 files changed, 23 insertions(+), 36 deletions(-)

diff --git a/sound/core/seq/seq.c b/sound/core/seq/seq.c
index e685ecc..7de98d7 100644
--- a/sound/core/seq/seq.c
+++ b/sound/core/seq/seq.c
@@ -84,26 +84,32 @@ static int __init alsa_seq_init(void)
 {
 	int err;
 
-	if ((err = client_init_data()) < 0)
-		goto error;
-
-	/* init event queues */
-	if ((err = snd_seq_queues_init()) < 0)
+	err = client_init_data();
+	if (err < 0)
 		goto error;
 
 	/* register sequencer device */
-	if ((err = snd_sequencer_device_init()) < 0)
+	err = snd_sequencer_device_init();
+	if (err < 0)
 		goto error;
 
 	/* register proc interface */
-	if ((err = snd_seq_info_init()) < 0)
-		goto error;
+	err = snd_seq_info_init();
+	if (err < 0)
+		goto error_device;
 
 	/* register our internal client */
-	if ((err = snd_seq_system_client_init()) < 0)
-		goto error;
+	err = snd_seq_system_client_init();
+	if (err < 0)
+		goto error_info;
 
 	snd_seq_autoload_init();
+	return 0;
+
+ error_info:
+	snd_seq_info_done();
+ error_device:
+	snd_sequencer_device_done();
  error:
 	return err;
 }
diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index 6fd4b07..a0b768e2 100644
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -2543,7 +2543,7 @@ int __init snd_sequencer_device_init(void)
 /* 
  * unregister sequencer device 
  */
-void __exit snd_sequencer_device_done(void)
+void snd_sequencer_device_done(void)
 {
 	snd_unregister_device(&seq_dev);
 	put_device(&seq_dev);
diff --git a/sound/core/seq/seq_info.c b/sound/core/seq/seq_info.c
index 9701544..b27fedd 100644
--- a/sound/core/seq/seq_info.c
+++ b/sound/core/seq/seq_info.c
@@ -50,7 +50,7 @@ create_info_entry(char *name, void (*read)(struct snd_info_entry *,
 	return entry;
 }
 
-static void free_info_entries(void)
+void snd_seq_info_done(void)
 {
 	snd_info_free_entry(queues_entry);
 	snd_info_free_entry(clients_entry);
@@ -70,12 +70,6 @@ int __init snd_seq_info_init(void)
 	return 0;
 
  error:
-	free_info_entries();
+	snd_seq_info_done();
 	return -ENOMEM;
 }
-
-int __exit snd_seq_info_done(void)
-{
-	free_info_entries();
-	return 0;
-}
diff --git a/sound/core/seq/seq_info.h b/sound/core/seq/seq_info.h
index f8549f8..2cdf8f6 100644
--- a/sound/core/seq/seq_info.h
+++ b/sound/core/seq/seq_info.h
@@ -30,11 +30,11 @@ void snd_seq_info_queues_read(struct snd_info_entry *entry, struct snd_info_buff
 
 
 #ifdef CONFIG_SND_PROC_FS
-int snd_seq_info_init( void );
-int snd_seq_info_done( void );
+int snd_seq_info_init(void);
+void snd_seq_info_done(void);
 #else
 static inline int snd_seq_info_init(void) { return 0; }
-static inline int snd_seq_info_done(void) { return 0; }
+static inline void snd_seq_info_done(void) {}
 #endif
 
 #endif
diff --git a/sound/core/seq/seq_queue.c b/sound/core/seq/seq_queue.c
index b377f50..3b3ac96 100644
--- a/sound/core/seq/seq_queue.c
+++ b/sound/core/seq/seq_queue.c
@@ -159,18 +159,8 @@ static void queue_delete(struct snd_seq_queue *q)
 
 /*----------------------------------------------------------------*/
 
-/* setup queues */
-int __init snd_seq_queues_init(void)
-{
-	/*
-	memset(queue_list, 0, sizeof(queue_list));
-	num_queues = 0;
-	*/
-	return 0;
-}
-
 /* delete all existing queues */
-void __exit snd_seq_queues_delete(void)
+void snd_seq_queues_delete(void)
 {
 	int i;
 
diff --git a/sound/core/seq/seq_queue.h b/sound/core/seq/seq_queue.h
index 7190934..76db43b 100644
--- a/sound/core/seq/seq_queue.h
+++ b/sound/core/seq/seq_queue.h
@@ -63,9 +63,6 @@ struct snd_seq_queue {
 /* get the number of current queues */
 int snd_seq_queue_get_cur_queues(void);
 
-/* init queues structure */
-int snd_seq_queues_init(void);
-
 /* delete queues */ 
 void snd_seq_queues_delete(void);
 
-- 
2.7.4