668 	struct devkmsg_user *user = file->private_data;  in devkmsg_read()  local
673 	if (!user)  in devkmsg_read()
676 	ret = mutex_lock_interruptible(&user->lock);  in devkmsg_read()
680 	while (user->seq == log_next_seq) {  in devkmsg_read()
689 					       user->seq != log_next_seq);  in devkmsg_read()
695 	if (user->seq < log_first_seq) {  in devkmsg_read()
697 		user->idx = log_first_idx;  in devkmsg_read()
698 		user->seq = log_first_seq;  in devkmsg_read()
704 	msg = log_from_idx(user->idx);  in devkmsg_read()
705 	len = msg_print_ext_header(user->buf, sizeof(user->buf),  in devkmsg_read()
706 				   msg, user->seq, user->prev);  in devkmsg_read()
707 	len += msg_print_ext_body(user->buf + len, sizeof(user->buf) - len,  in devkmsg_read()
711 	user->prev = msg->flags;  in devkmsg_read()
712 	user->idx = log_next(user->idx);  in devkmsg_read()
713 	user->seq++;  in devkmsg_read()
721 	if (copy_to_user(buf, user->buf, len)) {  in devkmsg_read()
727 	mutex_unlock(&user->lock);  in devkmsg_read()
733 	struct devkmsg_user *user = file->private_data;  in devkmsg_llseek()  local
736 	if (!user)  in devkmsg_llseek()
745 		user->idx = log_first_idx;  in devkmsg_llseek()
746 		user->seq = log_first_seq;  in devkmsg_llseek()
754 		user->idx = clear_idx;  in devkmsg_llseek()
755 		user->seq = clear_seq;  in devkmsg_llseek()
759 		user->idx = log_next_idx;  in devkmsg_llseek()
760 		user->seq = log_next_seq;  in devkmsg_llseek()
771 	struct devkmsg_user *user = file->private_data;  in devkmsg_poll()  local
774 	if (!user)  in devkmsg_poll()
780 	if (user->seq < log_next_seq) {  in devkmsg_poll()
782 		if (user->seq < log_first_seq)  in devkmsg_poll()
794 	struct devkmsg_user *user;  in devkmsg_open()  local
806 	user = kmalloc(sizeof(struct devkmsg_user), GFP_KERNEL);  in devkmsg_open()
807 	if (!user)  in devkmsg_open()
810 	mutex_init(&user->lock);  in devkmsg_open()
813 	user->idx = log_first_idx;  in devkmsg_open()
814 	user->seq = log_first_seq;  in devkmsg_open()
817 	file->private_data = user;  in devkmsg_open()
823 	struct devkmsg_user *user = file->private_data;  in devkmsg_release()  local
825 	if (!user)  in devkmsg_release()
828 	mutex_destroy(&user->lock);  in devkmsg_release()
829 	kfree(user);  in devkmsg_release()