int ret = 0, len;
DECLARE_WAITQUEUE(wait, current);
+ mutex_lock(&list->read_mutex);
while (ret == 0) {
- mutex_lock(&list->read_mutex);
if (list->head == list->tail) {
add_wait_queue(&list->hdev->debug_wait, &wait);
set_current_state(TASK_INTERRUPTIBLE);