Most recent kernel where this bug did not occur: 2.6.15 Distribution: Fedore Core 4 Hardware Environment: Intel 536ep/537 drivers Software Environment: Upgrading driver to kernel 2.6.16 Problem Description: tty_buffer_request_room, tty_insert_flip_string_flags are exported via EXPORT_SYMBOL_GPL instead of EXPORT_SYMBOL Steps to reproduce: insmod any serial driver that use of of these two routines and dmesg.
See http://forums.fedoraforum.org/showthread.php?p=482831#post482831
Providing your driver is GPL the insmod code will correctly allow you to use the functionality.
If your driver is not GPL'ed, this is expected and your problem. If your driver is GPL'ed, please reopen this bug and post the URL to the complete source to this bug so that I can debug your problem.