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ALSA: seq: Use atomic ops for autoload refcount 

... just to robustify for races.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2014-10-15 14:00:16 +02:00
parent bfe01a5ba2
commit 54841a06c5
1 changed files with 4 additions and 4 deletions
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8
sound/core/seq/seq_device.c
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@ -127,15 +127,15 @@ 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(0);
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
@ -147,7 +147,7 @@ void snd_seq_device_load_drivers(void)
/* Calling request_module during module_init()
* may cause blocking.
*/
if (snd_seq_in_init)
if (atomic_read(&snd_seq_in_init))
return;
mutex_lock(&ops_mutex);