diff options
author | Takashi Iwai <tiwai@suse.de> | 2014-10-20 08:45:52 +0200 |
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committer | Takashi Iwai <tiwai@suse.de> | 2014-10-20 08:45:52 +0200 |
commit | b566762a670cb651da2fc985feb3910c92e80427 (patch) | |
tree | 3281d9676d5ae79b04014d846899e57e58ed9d54 /sound/core | |
parent | e20095367325b1307f199fb0f193816209f12514 (diff) | |
parent | d5129f33a0d155d69cb0652cfc87bbc4d132ca17 (diff) | |
download | linux-b566762a670cb651da2fc985feb3910c92e80427.tar.bz2 |
Merge branch 'topic/seq-autoload' into for-next
Diffstat (limited to 'sound/core')
-rw-r--r-- | sound/core/seq/seq.c | 5 | ||||
-rw-r--r-- | sound/core/seq/seq_device.c | 103 |
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 |