drivers/hid/hidraw.c

41 static inline bool hidraw_is_revoked(struct hidraw_list *list)
43 	return list->revoked;
48 	struct hidraw_list *list = file->private_data;
52 	if (hidraw_is_revoked(list))
55 	mutex_lock(&list->read_mutex);
58 		if (list->head == list->tail) {
59 			add_wait_queue(&list->hidraw->wait, &wait);
62 			while (list->head == list->tail) {
67 				if (!list->hidraw->exist) {
77 				mutex_unlock(&list->read_mutex);
79 				mutex_lock(&list->read_mutex);
84 			remove_wait_queue(&list->hidraw->wait, &wait);
90 		len = list->buffer[list->tail].len > count ?
91 			count : list->buffer[list->tail].len;
93 		if (list->buffer[list->tail].value) {
94 			if (copy_to_user(buffer, list->buffer[list->tail].value, len)) {
101 		kfree(list->buffer[list->tail].value);
102 		list->buffer[list->tail].value = NULL;
103 		list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
106 	mutex_unlock(&list->read_mutex);
172 	struct hidraw_list *list = file->private_data;
175 	if (hidraw_is_revoked(list))
265 	struct hidraw_list *list = file->private_data;
268 	poll_wait(file, &list->hidraw->wait, wait);
269 	if (list->head != list->tail)
271 	if (!list->hidraw->exist || hidraw_is_revoked(list))
280 	struct hidraw_list *list;
284 	if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
316 	list->hidraw = hidraw_table[minor];
317 	mutex_init(&list->read_mutex);
319 	list_add_tail(&list->node, &hidraw_table[minor]->list);
321 	file->private_data = list;
326 		kfree(list);
333 	struct hidraw_list *list = file->private_data;
335 	if (hidraw_is_revoked(list))
338 	return fasync_helper(fd, file, on, &list->fasync);
369 	struct hidraw_list *list = file->private_data;
375 	while (list->tail != list->head) {
376 		kfree(list->buffer[list->tail].value);
377 		list->buffer[list->tail].value = NULL;
378 		list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
380 	list_del(&list->node);
382 	kfree(list);
390 static int hidraw_revoke(struct hidraw_list *list)
392 	list->revoked = true;
404 	struct hidraw_list *list = file->private_data;
409 	if (!dev || !dev->exist || hidraw_is_revoked(list)) {
452 					ret = hidraw_revoke(list);
553 	struct hidraw_list *list;
558 	list_for_each_entry(list, &dev->list, node) {
559 		int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
561 		if (hidraw_is_revoked(list) || new_head == list->tail)
564 		if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) {
568 		list->buffer[list->head].len = len;
569 		list->head = new_head;
570 		kill_fasync(&list->fasync, SIGIO, POLL_IN);
621 	INIT_LIST_HEAD(&dev->list);