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authorTakashi Iwai <tiwai@suse.de>2014-10-20 08:45:52 +0200
committerTakashi Iwai <tiwai@suse.de>2014-10-20 08:45:52 +0200
commitb566762a670cb651da2fc985feb3910c92e80427 (patch)
tree3281d9676d5ae79b04014d846899e57e58ed9d54 /sound/core
parente20095367325b1307f199fb0f193816209f12514 (diff)
parentd5129f33a0d155d69cb0652cfc87bbc4d132ca17 (diff)
Merge branch 'topic/seq-autoload' into for-next
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/seq/seq.c5
-rw-r--r--sound/core/seq/seq_device.c103
2 files changed, 75 insertions, 33 deletions
diff --git a/sound/core/seq/seq.c b/sound/core/seq/seq.c
index 712110561082..7e0aabb808a6 100644
--- a/sound/core/seq/seq.c
+++ b/sound/core/seq/seq.c
@@ -86,7 +86,6 @@ static int __init alsa_seq_init(void)
{
int err;
- snd_seq_autoload_lock();
if ((err = client_init_data()) < 0)
goto error;
@@ -110,8 +109,8 @@ static int __init alsa_seq_init(void)
if ((err = snd_seq_system_client_init()) < 0)
goto error;
+ snd_seq_autoload_init();
error:
- snd_seq_autoload_unlock();
return err;
}
@@ -131,6 +130,8 @@ static void __exit alsa_seq_exit(void)
/* release event memory */
snd_sequencer_memory_done();
+
+ snd_seq_autoload_exit();
}
module_init(alsa_seq_init)
diff --git a/sound/core/seq/seq_device.c b/sound/core/seq/seq_device.c
index 91a786a783e1..0631bdadd12b 100644
--- a/sound/core/seq/seq_device.c
+++ b/sound/core/seq/seq_device.c
@@ -56,6 +56,7 @@ MODULE_LICENSE("GPL");
#define DRIVER_LOADED (1<<0)
#define DRIVER_REQUESTED (1<<1)
#define DRIVER_LOCKED (1<<2)
+#define DRIVER_REQUESTING (1<<3)
struct ops_list {
char id[ID_LEN]; /* driver id */
@@ -127,42 +128,82 @@ static void snd_seq_device_info(struct snd_info_entry *entry,
#ifdef CONFIG_MODULES
/* avoid auto-loading during module_init() */
-static int snd_seq_in_init;
+static atomic_t snd_seq_in_init = ATOMIC_INIT(1); /* blocked as default */
void snd_seq_autoload_lock(void)
{
- snd_seq_in_init++;
+ atomic_inc(&snd_seq_in_init);
}
void snd_seq_autoload_unlock(void)
{
- snd_seq_in_init--;
+ atomic_dec(&snd_seq_in_init);
}
-#endif
-void snd_seq_device_load_drivers(void)
+static void autoload_drivers(void)
{
-#ifdef CONFIG_MODULES
- struct ops_list *ops;
+ /* avoid reentrance */
+ if (atomic_inc_return(&snd_seq_in_init) == 1) {
+ struct ops_list *ops;
+
+ mutex_lock(&ops_mutex);
+ list_for_each_entry(ops, &opslist, list) {
+ if ((ops->driver & DRIVER_REQUESTING) &&
+ !(ops->driver & DRIVER_REQUESTED)) {
+ ops->used++;
+ mutex_unlock(&ops_mutex);
+ ops->driver |= DRIVER_REQUESTED;
+ request_module("snd-%s", ops->id);
+ mutex_lock(&ops_mutex);
+ ops->used--;
+ }
+ }
+ mutex_unlock(&ops_mutex);
+ }
+ atomic_dec(&snd_seq_in_init);
+}
- /* Calling request_module during module_init()
- * may cause blocking.
- */
- if (snd_seq_in_init)
- return;
+static void call_autoload(struct work_struct *work)
+{
+ autoload_drivers();
+}
- mutex_lock(&ops_mutex);
- list_for_each_entry(ops, &opslist, list) {
- if (! (ops->driver & DRIVER_LOADED) &&
- ! (ops->driver & DRIVER_REQUESTED)) {
- ops->used++;
- mutex_unlock(&ops_mutex);
- ops->driver |= DRIVER_REQUESTED;
- request_module("snd-%s", ops->id);
- mutex_lock(&ops_mutex);
- ops->used--;
- }
+static DECLARE_WORK(autoload_work, call_autoload);
+
+static void try_autoload(struct ops_list *ops)
+{
+ if (!ops->driver) {
+ ops->driver |= DRIVER_REQUESTING;
+ schedule_work(&autoload_work);
}
+}
+
+static void queue_autoload_drivers(void)
+{
+ struct ops_list *ops;
+
+ mutex_lock(&ops_mutex);
+ list_for_each_entry(ops, &opslist, list)
+ try_autoload(ops);
mutex_unlock(&ops_mutex);
+}
+
+void snd_seq_autoload_init(void)
+{
+ atomic_dec(&snd_seq_in_init);
+#ifdef CONFIG_SND_SEQUENCER_MODULE
+ /* initial autoload only when snd-seq is a module */
+ queue_autoload_drivers();
+#endif
+}
+#else
+#define try_autoload(ops) /* NOP */
+#endif
+
+void snd_seq_device_load_drivers(void)
+{
+#ifdef CONFIG_MODULES
+ queue_autoload_drivers();
+ flush_work(&autoload_work);
#endif
}
@@ -214,13 +255,14 @@ int snd_seq_device_new(struct snd_card *card, int device, char *id, int argsize,
ops->num_devices++;
mutex_unlock(&ops->reg_mutex);
- unlock_driver(ops);
-
if ((err = snd_device_new(card, SNDRV_DEV_SEQUENCER, dev, &dops)) < 0) {
snd_seq_device_free(dev);
return err;
}
+ try_autoload(ops);
+ unlock_driver(ops);
+
if (result)
*result = dev;
@@ -318,16 +360,12 @@ int snd_seq_device_register_driver(char *id, struct snd_seq_dev_ops *entry,
entry->init_device == NULL || entry->free_device == NULL)
return -EINVAL;
- snd_seq_autoload_lock();
ops = find_driver(id, 1);
- if (ops == NULL) {
- snd_seq_autoload_unlock();
+ if (ops == NULL)
return -ENOMEM;
- }
if (ops->driver & DRIVER_LOADED) {
pr_warn("ALSA: seq: driver_register: driver '%s' already exists\n", id);
unlock_driver(ops);
- snd_seq_autoload_unlock();
return -EBUSY;
}
@@ -344,7 +382,6 @@ int snd_seq_device_register_driver(char *id, struct snd_seq_dev_ops *entry,
mutex_unlock(&ops->reg_mutex);
unlock_driver(ops);
- snd_seq_autoload_unlock();
return 0;
}
@@ -554,6 +591,9 @@ static int __init alsa_seq_device_init(void)
static void __exit alsa_seq_device_exit(void)
{
+#ifdef CONFIG_MODULES
+ cancel_work_sync(&autoload_work);
+#endif
remove_drivers();
#ifdef CONFIG_PROC_FS
snd_info_free_entry(info_entry);
@@ -570,6 +610,7 @@ EXPORT_SYMBOL(snd_seq_device_new);
EXPORT_SYMBOL(snd_seq_device_register_driver);
EXPORT_SYMBOL(snd_seq_device_unregister_driver);
#ifdef CONFIG_MODULES
+EXPORT_SYMBOL(snd_seq_autoload_init);
EXPORT_SYMBOL(snd_seq_autoload_lock);
EXPORT_SYMBOL(snd_seq_autoload_unlock);
#endif

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