/*
* Look up an ACM structure by index. If found and not disconnected, increment
* its refcount and return it with its mutex held.
*/
static struct acm *acm_get_by_index(unsigned index)
{
struct acm *acm;
mutex_lock(&acm_table_lock);
acm = acm_table[index];
if (acm) {
mutex_lock(&acm->mutex);
if (acm->disconnected) {
mutex_unlock(&acm->mutex);
acm = NULL;
} else {
tty_port_get(&acm->port);
mutex_unlock(&acm->mutex);
}
}
mutex_unlock(&acm_table_lock);
return acm;
}
static int gdm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
{
struct gdm *gdm = NULL;
int ret;
int i;
int j;
j = GDM_TTY_MINOR;
for (i = 0; i < TTY_MAX_COUNT; i++) {
if (!strcmp(tty->driver->driver_name, DRIVER_STRING[i])) {
j = tty->index;
break;
}
}
if (j == GDM_TTY_MINOR)
return -ENODEV;
mutex_lock(&gdm_table_lock);
gdm = gdm_table[i][j];
if (gdm == NULL) {
mutex_unlock(&gdm_table_lock);
return -ENODEV;
}
tty_port_get(&gdm->port);
ret = tty_standard_install(driver, tty);
if (ret) {
tty_port_put(&gdm->port);
mutex_unlock(&gdm_table_lock);
return ret;
}
tty->driver_data = gdm;
mutex_unlock(&gdm_table_lock);
return 0;
}
