diff options
Diffstat (limited to 'drivers/dibs/dibs_main.c')
| -rw-r--r-- | drivers/dibs/dibs_main.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/dibs/dibs_main.c b/drivers/dibs/dibs_main.c index 68e189932fcf..a5d2be9c3246 100644 --- a/drivers/dibs/dibs_main.c +++ b/drivers/dibs/dibs_main.c @@ -20,6 +20,41 @@ MODULE_LICENSE("GPL"); /* use an array rather a list for fast mapping: */ static struct dibs_client *clients[MAX_DIBS_CLIENTS]; static u8 max_client; +static DEFINE_MUTEX(clients_lock); + +int dibs_register_client(struct dibs_client *client) +{ + int i, rc = -ENOSPC; + + mutex_lock(&clients_lock); + for (i = 0; i < MAX_DIBS_CLIENTS; ++i) { + if (!clients[i]) { + clients[i] = client; + client->id = i; + if (i == max_client) + max_client++; + rc = 0; + break; + } + } + mutex_unlock(&clients_lock); + + return rc; +} +EXPORT_SYMBOL_GPL(dibs_register_client); + +int dibs_unregister_client(struct dibs_client *client) +{ + int rc = 0; + + mutex_lock(&clients_lock); + clients[client->id] = NULL; + if (client->id + 1 == max_client) + max_client--; + mutex_unlock(&clients_lock); + return rc; +} +EXPORT_SYMBOL_GPL(dibs_unregister_client); static int __init dibs_init(void) { |