1 files changed, 775 insertions, 0 deletions

diff --git a/drivers/char/ChangeLog b/drivers/char/ChangeLog
new file mode 100644
index 000000000000..56b8a2e76ab1
--- /dev/null
+++ b/drivers/char/ChangeLog
@@ -0,0 +1,775 @@
+2001-08-11  Tim Waugh  <twaugh@redhat.com>
+
+        * serial.c (get_pci_port): Deal with awkward Titan cards.
+
+1998-08-26  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * serial.c (rs_open): Correctly decrement the module in-use count
+                on errors.
+
+Thu Feb 19 14:24:08 1998  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * tty_io.c (tty_name): Remove the non-reentrant (and non-SMP safe)
+                version of tty_name, and rename the reentrant _tty_name
+                function to be tty_name.
+                (tty_open): Add a warning message stating callout devices
+                are deprecated.
+
+Mon Dec  1 08:24:15 1997  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * tty_io.c (tty_get_baud_rate): Print a warning syslog if the
+                tty->alt_speed kludge is used; this means the system is
+                using the deprecated SPD_HI ioctls.
+
+Mon Nov 24 10:37:49 1997  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * serial.c, esp.c, rocket.c: Change drivers to take advantage of
+                tty_get_baud_rate().
+        
+        * tty_io.c (tty_get_baud_rate): New function which computes the
+                correct baud rate for the tty.  More factoring out of
+                common code out of the serial driver to the high-level tty
+                functions....
+
+Sat Nov 22 07:53:36 1997  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * serial.c, esp.c, rocket.c: Add tty->driver.break() routine, and
+                allow high-level tty code to handle the break and soft
+                carrier ioctls.
+        
+        * tty_ioctl.c (n_tty_ioctl): Support TIOCGSOFTCAR and
+                TIOCSSOFTCAR, so that device drivers don't have to support
+                it.
+
+        * serial.c (autoconfig): Change 16750 test to hopefully eliminate
+                false results by people with strange 16550As being
+                detected as 16750s.  Hopefully 16750s will still be
+                detected as 16750, and other weird UARTs won't get poorly
+                autodetected.  If this doesn't work, I'll have to disable
+                the auto identification for the 16750.
+
+        * tty_io.c (tty_hangup): Now actually do the tty hangup
+                processing during the timer processing, and disable
+                interrupts while doing the hangup processing.  This avoids
+                several nasty race conditions which happened when the
+                hangup processing was done asynchronously.
+                (tty_ioctl): Do break handling in the tty driver if
+                driver's break function is supported.  
+                (tty_flip_buffer_push): New exported function which should
+                be used by drivers to push characters in the flip buffer
+                to the tty handler.  This may either be done using a task
+                queue function for better CPU efficiency, or directly for
+                low latency operation.
+
+        * serial.c (rs_set_termios): Fix bug rs_set_termios when
+                transitioning away from B0, submitted by Stanislav
+                Voronyi. 
+
+Thu Jun 19 20:05:58 1997  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * serial.c (begin_break, end_break, rs_ioctl): Applied patch
+                to support BSD ioctls to set and clear the break
+                condition explicitly.
+
+        * console.c (scrup, scrdown, insert_line, delete_line): Applied
+                fix suggested by Aaron Tiensivu to speed up block scrolls
+                up and down.
+
+        * n_tty.c (opost_block, write_chan): Added a modified "fast
+                console" patch which processes a block of text via
+                "cooking" efficiently.
+
+Wed Jun 18 15:25:50 1997  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * tty_io.c (init_dev, release_dev): Applied fix suggested by Bill
+                Hawes to prevent race conditions in the tty code.
+
+        * n_tty.c (n_tty_chars_in_buffer): Applied fix suggested by Bill
+                Hawes so that n_tty_chars_in_buffer returns the correct
+                value in the case when the tty is in cannonical mode.  (To
+                avoid a pty deadlock with telnetd.)
+
+Thu Feb 27 01:53:08 1997  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * serial.c (change_speed): Add support for the termios flag
+                CMSPAR, which allows the user to select stick parity.
+                (i.e, if PARODD is set, the parity bit is always 1; if
+                PARRODD is not set, then the parity bit is always 0).
+
+Wed Feb 26 19:03:10 1997  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * serial.c (cleanup_module): Fix memory leak when using the serial
+                driver as a module; make sure tmp_buf gets freed!
+
+Tue Feb 25 11:01:59 1997  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * serial.c (set_modem_info): Add support for setting and clearing
+                the OUT1 and OUT2 bits.  (For special case UART's, usually
+                for half-duplex.)
+                (autoconfig, change_speed): Fix TI 16750 support.
+
+Sun Feb 16 00:14:43 1997  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * tty_io.c (release_dev): Add sanity check to make sure there are
+                no waiters on tty->read_wait or tty->write_wait.
+
+        * serial.c (rs_init): Don't autoconfig a device if the I/O region
+                is already reserved.
+
+        * serial.c (serial_proc_info): Add support for /proc/serial.
+
+Thu Feb 13 00:49:10 1997  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * serial.c (receive_chars): When the UART repotrs an overrun
+                condition, it does so with a valid character.  Changed to
+                not throw away the valid character, but instead report the
+                overrun after the valid character.
+
+        * serial.c: Added new #ifdef's for some of the advanced serial
+                driver features.  A minimal driver that only supports COM
+                1/2/3/4 without sharing serial interrupts only takes 17k;
+                the full driver takes 32k.
+                
+Wed Feb 12 14:50:44 1997  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * vt.c:
+        * pty.c: 
+        * tty_ioctl.c: 
+        * serial.c: Update routines to use the new 2.1 memory access
+                routines.
+
+Wed Dec  4 07:51:52 1996  Theodore Ts'o  <tytso@localhost.mit.edu>
+
+        * serial.c (change_speed): Use save_flags(); cli() and
+                restore_flags() in order to ensure we don't accidentally
+                turn on interrupts when starting up the port.
+                (startup): Move the insertion of serial structure into the
+                IRQ chain earlier into the startup processing.  Interrupts
+                should be off this whole time, but we eventually will want
+                to reduce this window.
+
+Thu Nov 21 10:05:22 1996  Theodore Ts'o  <tytso@localhost.mit.edu>
+
+        * tty_ioctl.c (tty_wait_until_sent): Always check the driver
+                wait_until_ready routine, even if there are no characters
+                in the xmit buffer.  (There may be charactes in the device
+                FIFO.)
+                (n_tty_ioctl): Add new flag tty->flow_stopped which
+                indicates whether the tty is stopped due to a request by
+                the TCXONC ioctl (used by tcflow).  If so, don't let an
+                incoming XOFF character restart the tty.  The tty can only
+                be restarted by another TCXONC request.
+
+        * tty_io.c (start_tty): Don't allow the tty to be restarted if
+                tty->flow_stopped is true.
+
+        * n_tty.c (n_tty_receive_char): If tty->flow_stopped is true, and
+                IXANY is set, don't eat a character trying to restart the
+                tty.
+
+        * serial.c (startup): Remove need for MCR_noint from the
+                async_struct structure.  Only turn on DTR and RTS if the
+                baud rate is not zero.
+                (change_speed): More accurately calculate the timeout
+                value based on the word size.  Move responsibility of
+                hangup when speed becomes B0 to rs_set_termios()
+                (set_serial_info): When changing the UART type set the
+                current xmit_fifo_size as well as the permanent
+                xmit_fifo_size.
+                (rs_ioctl): Fix TCSBRK (used by tcdrain) and TCSBRKP
+                ioctls to return EINTR if interrupted by a signal.
+                (rs_set_termios): If the baud rate changes to or from B0,
+                this function is now responsible for setting or clearing
+                DTR and RTS.  DTR and RTS are only be changed on the
+                transition to or from the B0 state.
+                (rs_close): Wait for the characters to drain based on
+                info->timeout.  At low baud rates (50 bps), it may take a
+                long time for the FIFO to completely drain out!
+                (rs_wait_until_sent): Fixed timeout handling.  Now
+                releases control to the scheduler, but checks frequently
+                enough so that the function is sensitive enough to pass
+                the timing requirements of the NIST-PCTS.
+                (block_til_ready): When opening the device, don't turn on
+                DTR and RTS if the baud rate is B0.
+
+Thu Nov 14 00:06:09 1996  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * serial.c (autoconfig): Fix autoconfiguration problems;
+                info->flags wasn't getting initialized from the state
+                structure.  Put in more paranoid test for the 16750.
+
+Fri Nov  8 20:19:50 1996  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * n_tty.c (n_tty_flush_buffer): Only call driver->unthrottle() if
+                the tty was previous throttled.
+                (n_tty_set_termios, write_chan): Add changes suggested by
+                        Simon P. Allen to allow hardware cooking.
+
+        * tty_ioctl.c (set_termios): If we get a signal while waiting for
+                the tty to drain, return -EINTR.
+        
+        * serial.c (change_speed): Add support for CREAD, as required by
+                POSIX.
+
+Sat Nov  2 20:43:10 1996  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * serial.c: Wholesale changes.  Added support for the Startech
+                16650 and 16650V2 chips.  (WARNING: the new startech
+                16650A may or may not work!)  Added support for the
+                TI16750 (not yet tested).  Split async_struct into a
+                transient part (async_struct) and a permanent part
+                (serial_state) which contains the configuration
+                information for the ports.  Added new driver routines
+                wait_until_sent() and send_xchar() to help with POSIX
+                compliance.  Added support for radio clocks which waggle
+                the carrier detect line (CONFIG_HARD_PPS).
+        
+        * tty_ioctl.c (tty_wait_until_sent): Added call to new driver
+                function tty->driver.wait_until_sent(), which returns when
+                the tty's device xmit buffers are drained.  Needed for
+                full POSIX compliance.
+
+                (send_prio_char): New function, called by the ioctl's
+                TCIOFF and TCION; uses the new driver call send_xchar(),
+                which will send the XON or XOFF character at high priority
+                (and even if tty output is stopped).
+
+Wed Jun  5 18:52:04 1996  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * pty.c (pty_close): When closing a pty, make sure packet mode is
+                cleared.
+
+Sun May 26 09:33:52 1996  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * vesa_blank.c (set_vesa_blanking): Add missing verify_area() call.
+
+        * selection.c (set_selection): Add missing verify_area() call.
+
+        * tty_io.c (tty_ioctl): Add missing verify_area() calls.
+
+        * serial.c (rs_ioctl): Add missing verify_area() calls.
+                (rs_init): Allow initialization of serial driver
+                configuration from a module.
+
+        * random.c (extract_entropy): Add missing verify_area call.
+                Don't limit number of characters returned to
+                32,768. Extract entropy is now no longer a inlined
+                function.
+
+                (random_read): Check return value in case extract_entropy
+                returns an error.
+
+                (secure_tcp_sequence_number): New function which returns a
+                secure TCP sequence number.  This is needed to prevent some
+                nasty TCP hijacking attacks.
+        
+                (init_std_data): Initialize using gettimeofday() instead of
+                struct timeval xtime.
+
+                (fast_add_entropy_word, add_entropy_word): Rename the
+                inline function add_entropy_word() to
+                fast_add_entropy_word().  Make add_entropy_word() be the
+                non-inlined function which is used in non-timing critical
+                places, in order to save space.
+
+                (initialize_benchmark, begin_benchmark, end_benchmark): New
+                functions defined when RANDOM_BENCHMARK is defined.  They
+                allow us to benchmark the speed of the
+                add_timer_randomness() call.
+
+                (int_ln, rotate_left): Add two new inline functions with
+                i386 optimized asm instructions.  This speeds up the
+                critical add_entropy_word() and add_timer_randomness()
+                functions, which are called from interrupt handlers.
+
+Tue May  7 22:51:11 1996    <tytso@rsts-11.mit.edu>
+
+        * random.c (add_timer_randomness): Limit the amount randomness
+                that we estimate to 12 bits.  (An arbitrary amount).
+
+                (extract_entropy): To make it harder to analyze the hash
+                function, fold the hash function in half using XOR, and
+                use the folded result as the value to emit to the user.
+                Also, add timer randomness each pass through the
+                exact_entropy call, to increase the amount of unknown
+                values during the extraction process.
+
+                (random_ioctl): Use IOR/IOW definitions to define the
+                ioctl values used by the /dev/random driver.  Allow the
+                old ioctl values to be used for backwards compatibility
+                (for a limited amount of time).
+
+Wed Apr 24 14:02:04 1996  Theodore Ts'o  <tytso@rsts-11.mit.edu>
+
+        * random.c (add_timer_randomness): Use 2nd derivative as well to
+                better estimate entropy.
+
+                (rand_initialize): Explicitly initialize all the pointers
+                to NULL.  (Clearing pointers using memset isn't portable.)
+                Initialize the random pool with OS-dependent data.
+
+                (random_write): Add sanity checking to the arguments to
+                random_write(), so that bad arguments won't cause a kernel
+                SEGV. 
+
+                (random_read): Update the access time of the device inode
+                when you return data to the user.
+
+                (random_ioctl): Wake up the random_wait channel when there
+                are only WAIT_INPUT_BITS available.  Add more paranoia
+                checks to make sure entropy_count doesn't go beyond the
+                bounds of (0, POOLSIZE).  Add a few missing verify_area
+                checks.  Add support for the RNDCLEARPOOL ioctl, which
+                zaps the random pool.
+
+                (add_timer_randomness): Wake up the random_wait
+                channel only when there are WAIT_INPUT_BITS available.
+
+                (random_select): Allow a random refresh daemon process to
+                select on /dev/random for writing; wake up the daemon when
+                there are less than WAIT_OUTPUT_BITS bits of randomness
+                available.
+
+Tue Apr 23 22:56:07 1996    <tytso@rsts-11.mit.edu>
+
+        * tty_io.c (init_dev): Change return code when user attempts to
+                open master pty which is already open from EAGAIN to EIO,
+                to match with BSD expectations.  EIO is more correct
+                anyway, since EAGAIN implies that retrying will be
+                successful --- which it might be.... Eventually!!
+
+        * pty.c (pty_open, pty_close): Fix wait loop so that we don't
+                busy loop while waiting for the master side to open.
+                Fix tty opening/closing logic.  TTY_SLAVE_CLOSED was
+                renamed to TTY_OTHER_CLOSED, so that the name is more
+                descriptive.  Also fixed code so that the tty flag
+                actually works correctly now....
+
+Mon Apr  1 10:22:01 1996    <tytso@rsts-11.mit.edu>
+
+        * serial.c (rs_close): Cleaned up modularization changes.
+                Remove code which forced line discipline back to N_TTY
+                this is done in the tty upper layers, and there's no
+                reason to do it here.  (Making this change also
+                removed the requirement that the serial module access
+                the internal kernel symbol "ldiscs".)
+
+        * tty_io.c (tty_init): Formally register a tty_driver entry for
+                /dev/tty (device 4, 0) and /dev/console (device 5, 0).
+                This guarantees that major device numbers 4 and 5 will be
+                reserved for the tty subsystem (as they have to be because
+                of /dev/tty and /dev/console).  Removed tty_regdev, as
+                this interface is no longer necessary.
+
+Sun Mar 17 20:42:47 GMT 1996 <ah@doc.ic.ac.uk>
+
+        * serial.c : modularisation (changes in linux/fs/device.c allow
+                kerneld to automatically load the serial module).
+
+        * Makefile, Config.in : serial modularisation adds.
+
+        * tty_io.c : tty_init_ctty used by to register "cua" driver just
+                for the /dev/tty device (5,0).  Added tty_regdev.
+        
+        * serial.c (shutdown, rs_ioctl) : when port shuts down wakeup processes
+          waiting on delta_msr_wait. The TIOCMIWAIT ioctl returns EIO
+          if no change was done since the time of call.
+
+Sat Mar 16 14:33:13 1996 <aeb@cwi.nl>
+
+        * tty_io.c (disassociate_ctty): If disassociate_ctty is called by
+                exit, do not perform an implicit vhangup on a pty.
+
+Fri Feb  9 14:15:47 1996    <tytso@rsts-11.mit.edu>
+
+        * serial.c (block_til_ready): Fixed another race condition which
+                happens if a hangup happens during the open.
+
+Wed Jan 10 10:08:00 1996    <tytso@rsts-11.mit.edu>
+
+        * serial.c (block_til_ready): Remove race condition which happened
+                if a hangup condition happened during the setup of the
+                UART, before rs_open() called block_til_ready().  This
+                caused the info->count counter to be erroneously
+                decremented.
+
+        * serial.c (startup, rs_open): Remove race condition that could
+                cause a memory leak of one page.  (Fortunately, both race
+                conditions were relatively rare in practice.)
+
+Tue Dec  5 13:21:27 1995    <tytso@rsts-11.mit.edu>
+
+        * serial.c (check_modem_status, rs_ioctl): Support the new
+                ioctl()'s TIOCGICOUNT, TIOCMIWAIT.  These allow an
+                application program to wait on a modem serial register
+                status bit change, and to find out how many changes have
+                taken place for the MSR bits.
+
+                (rs_write): Eliminate a race condition which is introduced
+                if it is necessary to wait for the semaphore.
+
+Sat Nov  4 17:14:45 1995    <tytso@rsts-11.mit.edu>
+
+        * tty_io.c (tty_init): Move registration of TTY_MAJOR and
+                TTY_AUX_MAJOR to the end, so that /proc/devices looks
+                prettier. 
+
+        * pty.c (pty_init): Use new major numbers for PTY master and slave
+                devices.  This allow us to have more than 64 pty's.  We
+                register the old pty devices for backwards compatibility.
+                Note that a system should either be using the old pty
+                devices or the new pty devices --- in general, it should
+                try to use both, since they map into the same pty table.
+                The old pty devices are strictly for backwards compatibility.
+
+Wed Oct 11 12:45:24 1995    <tytso@rsts-11.mit.edu>
+
+        * tty_io.c (disassociate_ctty): If disassociate_ctty is called by
+                exit, perform an implicit vhangup on the tty.
+
+        * pty.c (pty_close): When the master pty is closed, send a hangup
+                to the slave pty.
+                (pty_open): Use the flag TTY_SLAVE_CLOSED to test to see
+                if there are any open slave ptys, instead of using
+                tty->link->count.  The old method got confused if there
+                were processes that had hung-up file descriptors on the
+                slave tty.
+
+Tue May  2 00:53:25 1995    <tytso@rsx-11.mit.edu>
+
+        * tty_io.c (tty_set_ldisc): Wait until the output buffer is
+                drained before closing the old line discipline --- needed
+                in only one case: XON/XOFF processing.
+
+        * n_tty.c (n_tty_close): Don't bother waiting until the output
+                driver is closed; in general, the line discipline
+                shouldn't care if the hardware is finished
+                transmitting before the line discipline terminates.
+
+        * tty_io.c (release_dev): Shutdown the line discipline after
+                decrementing the tty count variable; but set the
+                TTY_CLOSING flag so that we know that this tty structure
+                isn't long for this world.
+
+        * tty_io.c (init_dev): Add sanity code to check to see if
+                TTY_CLOSING is set on a tty structure; if so, something
+                bad has happened (probably a line discipline close blocked
+                when it shouldn't have; so do a kernel printk and then
+                return an error).
+
+Wed Apr 26 10:23:44 1995  Theodore Y. Ts'o  <tytso@localhost>
+
+        * tty_io.c (release_dev): Try to shutdown the line discipline
+                *before* decrementing the tty count variable; this removes
+                a potential race condition which occurs when the line
+                discipline close blocks, and another process then tries
+                open the same serial port.
+
+        * serial.c (rs_hangup): When hanging up, flush the output buffer
+                before shutting down the UART.  Otherwise the line
+                discipline close blocks waiting for the characters to get
+                flushed, which never happens until the serial port gets reused.
+
+Wed Apr 12 08:06:16 1995  Theodore Y. Ts'o  <tytso@localhost>
+
+        * serial.c (do_serial_hangup, do_softint, check_modem_status,
+                rs_init):  Hangups are now scheduled via a separate tqueue
+                structure in the async_struct structure, tqueue_hangup.
+                This task is pushed on to the tq_schedule queue, so that
+                it is processed synchronously by the scheduler.
+
+Sat Feb 18 12:13:51 1995  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * tty_io.c (disassociate_ctty, tty_open, tty_ioctl): Clear
+                current->tty_old_pgrp field when a session leader
+                acquires a controlling tty, and after a session leader
+                has disassociated from a controlling tty.
+
+Fri Feb 17 09:34:09 1995  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * serial.c (rs_interrupt_single, rs_interrupt, rs_interrupt_multi): 
+                Change the number of passes made from 64 to be 256,
+                configurable with the #define RS_ISR_PASS_LIMIT.
+
+        * serial.c (rs_init, set_serial_info, get_serial_info, rs_close):
+                Remove support for closing_wait2.  Instead, set
+                tty->closing and rely on the line discipline to prevent
+                echo wars.
+
+        * n_tty.c (n_tty_receive_char):  IEXTEN does not need to be
+                enabled in order for IXANY to be active.
+
+                If tty->closing is set, then only process XON and XOFF
+                characters.
+
+Sun Feb 12 23:57:48 1995  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * serial.c (rs_timer): Change the interrupt poll time from 60
+                seconds to 10 seconds, configurable with the #define
+                RS_STROBE_TIME.
+
+        * serial.c (rs_interrupt_multi, startup, shutdown, rs_ioctl,
+                set_multiport_struct, get_multiport_struct): Add
+                provisions for a new type of interrupt service routine,
+                which better supports multiple serial ports on a single
+                IRQ.  
+
+Sun Feb  5 19:35:11 1995  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * tty_ioctl.c (n_tty_ioctl, set_termios, tty_wait_until_sent): 
+        * serial.c (rs_ioctl, rs_close): 
+        * cyclades.c (cy_ioctl, cy_close): 
+        * n_tty.c (n_tty_close):  Rename wait_until_sent to
+                tty_wait_until_sent, so that it's a better name to export
+                in ksyms.c.
+
+Sat Feb  4 23:36:20 1995  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * serial.c (rs_close): Added missing check for closing_wait2 being
+                ASYNC_CLOSING_WAIT_NONE.
+
+Thu Jan 26 09:02:49 1995  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * serial.c (rs_init, set_serial_info, get_serial_info,
+                rs_close): Support close_wait in the serial driver.
+                This is helpful for slow devices (like serial
+                plotters) so that their outputs don't get flushed upon
+                device close.  This has to be configurable because
+                normally we don't want ports to be hung up for long
+                periods of time during a close when they are not
+                connected to a device, or the device is powered off.
+
+                The default is to wait 30 seconds; in the case of a
+                very slow device, the close_wait timeout should be
+                lengthened.  If it is set to 0, the kernel will wait
+                forever for all of the data to be transmitted.
+
+Thu Jan 17 01:17:20 1995  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * serial.c (startup, change_speed, rs_init): Add support to detect
+                the StarTech 16650 chip.  Treat it as a 16450 for now,
+                because of its FIFO bugs.
+
+Thu Jan  5 21:21:57 1995  <dahinds@users.sourceforge.net>
+
+        * serial.c: (receive_char): Added counter to prevent infinite loop
+                when a PCMCIA serial device is ejected.
+
+Thu Dec 29 17:53:48 1994    <tytso@rsx-11.mit.edu>
+
+        * tty_io.c (check_tty_count): New procedure which checks
+                tty->count to make sure that it matches with the number of
+                open file descriptors which point at the structure.  If
+                the number doesn't match, it prints a warning message.
+
+Wed Dec 28 15:41:51 1994    <tytso@rsx-11.mit.edu>
+
+        * tty_io.c (do_tty_hangup, disassociate_ctty): At hangup time,
+                save the tty's current foreground process group in the
+                session leader's task structure.  When the session leader
+                terminates, send a SIGHUP, SIGCONT to that process group.
+                This is not required by POSIX, but it's not prohibited
+                either, and it appears to be the least intrusive way
+                to fix a problem that dialup servers have with
+                orphaned process groups caused by modem hangups.
+
+Thu Dec  8 14:52:11 1994    <tytso@rsx-11.mit.edu>
+
+        * serial.c (rs_ioctl): Don't allow most ioctl's if the serial port
+                isn't initialized.
+
+        * serial.c (rs_close): Don't clear the IER if the serial port
+                isn't initialized. 
+
+        * serial.c (block_til_ready): Don't try to block on the dialin
+                port if the serial port isn't initialized.
+
+Wed Dec  7 10:48:30 1994  Si Park (si@wimpol.demon.co.uk)
+        * tty_io.c (tty_register_driver): Fix bug when linking onto
+                the tty_drivers list. We now test that there are elements
+                already on the list before setting the back link from the
+                first element to the new driver.
+
+        * tty_io.c (tty_unregister_driver): Fix bug in unlinking the
+                specified driver from the tty_drivers list. We were not
+                setting the back link correctly. This used to result in
+                a dangling back link pointer and cause panics on the next
+                call to get_tty_driver().
+
+Tue Nov 29 10:21:09 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * tty_io.c (tty_unregister_driver): Fix bug in
+                tty_unregister_driver where the pointer to the refcount is
+                tested, instead of the refcount itself.  This caused
+                tty_unregister_driver to always return EBUSY.
+
+Sat Nov 26 11:59:24 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * tty_io.c (tty_ioctl): Add support for the new ioctl
+                TIOCTTYGSTRUCT, which allow a kernel debugging program
+                direct read access to the tty and tty_driver structures.
+
+Fri Nov 25 17:26:22 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * serial.c (rs_set_termios): Don't wake up processes blocked in
+                open when the CLOCAL flag changes, since a blocking
+                open only samples the CLOCAL flag once when it blocks,
+                and doesn't check it again.  (n.b.  FreeBSD has a
+                different behavior for blocking opens; it's not clear
+                whether Linux or FreeBSD's interpretation is correct.
+                POSIX doesn't give clear guidance on this issue, so
+                this may change in the future....)
+
+        * serial.c (block_til_ready): Use the correct termios structure to
+                check the CLOCAL flag.  If the cuaXX device is active,
+                then check the saved termios for the ttySXX device.
+                Otherwise, use the currently active termios structure.
+
+Sun Nov  6 21:05:44 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * serial.c (change_speed): Add support for direct access of
+                57,600 and 115,200 bps.
+
+Wed Nov  2 10:32:36 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * n_tty.c (n_tty_receive_room): Only allow excess characters
+                through if we are in ICANON mode *and* there are other no
+                pending lines in the buffer.  Otherwise cut and paste over
+                4k breaks.
+
+Sat Oct 29 18:17:34 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * serial.c (rs_ioctl, get_lsr_info): Added patch suggested by Arne
+                Riiber so that user mode programs can tell when the
+                transmitter shift register is empty.
+
+Thu Oct 27 23:14:29 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * tty_ioctl.c (wait_until_sent): Added debugging printk statements
+                (under the #ifdef TTY_DEBUG_WAIT_UNTIL_SENT)  
+
+        * serial.c (rs_interrupt, rs_interrupt_single, receive_chars,
+                change_speed, rs_close): rs_close now disables receiver
+                interrupts when closing the serial port.  This allows the
+                serial port to close quickly when Linux and a modem (or a
+                mouse) are engaged in an echo war; when closing the serial
+                port, we now first stop listening to incoming characters,
+                and *then* wait for the transmit buffer to drain.  
+
+                In order to make this change, the info->read_status_mask
+                is now used to control what bits of the line status
+                register are looked at in the interrupt routine in all
+                cases; previously it was only used in receive_chars to
+                select a few of the status bits.
+
+Mon Oct 24 23:36:21 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * serial.c (rs_close): Add a timeout to the transmitter flush
+                loop; this is just a sanity check in case we have flaky
+                (or non-existent-but-configured-by-the-user) hardware.
+
+Fri Oct 21 09:37:23 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * tty_io.c (tty_fasync): When asynchronous I/O is enabled, if the
+                process or process group has not be specified yet, set it
+                to be the tty's process group, or if that is not yet set,
+                to the current process's pid.
+
+Thu Oct 20 23:17:28 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * n_tty.c (n_tty_receive_room): If we are doing input
+                canonicalization, let as many characters through as
+                possible, so that the excess characters can be "beeped".
+
+Tue Oct 18 10:02:43 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * serial.c (rs_start): Removed an incorrect '!' that was
+                preventing transmit interrupts from being re-enabled in
+                rs_start().  Fortunately in most cases it would be
+                re-enabled elsewhere, but this still should be fixed
+                correctly.
+
+Sun Oct  9 23:46:03 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * tty_io.c (do_tty_hangup): If the tty driver flags
+                TTY_DRIVER_RESET_TERMIOS is set, then reset the termios
+                settings back to the driver's initial configuration.  This
+                allows the termios settings to be reset even if a process
+                has hung up file descriptors keeping a pty's termios from
+                being freed and reset.
+
+        * tty_io.c (release_dev): Fix memory leak.  The pty's other
+                termios structure should also be freed.
+
+        * serial.c (rs_close, shutdown): Change how we wait for the
+                transmitter to completely drain before shutting down the
+                serial port.  We now do it by scheduling in another
+                process instead of busy looping with the interrupts turned
+                on.  This may eliminate some race condition problems that
+                some people seem to be reporting.
+
+Sun Sep 25 14:18:14 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * tty_io.c (release_dev): When freeing a tty make sure that both
+                the tty and the o_tty (if present) aren't a process's
+                controlling tty.  (Previously, we only checked the tty.)
+
+        * serial.c (change_speed): Only enable the Modem Status
+                Interrupt for a port if CLOCAL is not set or CRTSCTS
+                is set.  If we're not checking the carrier detect and
+                CTS line, there's no point in enabling the modem
+                status interrupt.  This will save spurious interrupts
+                from slowing down systems who have terminals that
+                don't support either line.  (Of course, if you want
+                only one of CD and CTS support, you will need a
+                properly wired serial cable.)
+
+Thu Sep 22 08:32:48 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * tty_io.c (do_SAK): Return if tty is null.
+
+        * tty_io.c (_tty_name): Return "NULL tty" if the passed in tty is
+                NULL.
+
+Sat Sep 17 13:19:25 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * tty_ioctl.c (n_tty_ioctl): Fix TIOCGLCKTRMIOS and
+                TIOCSLCKTRMIOS, which were totally broken.  Remove
+                extra indirection from argument; it should be a struct
+                termios *, not a struct termios **.
+                &real_tty->termios_locked should have been
+                real_tty->termios_locked.  This caused us to be
+                reading and writing the termios_locked structure to
+                random places in kernel memory.  
+
+        * tty_io.c (release_dev): Oops!  Forgot to delete a critical kfree
+                of the locked_termios.  This leaves the locked_termios
+                structure pointed at a freed object.  
+
+Fri Sep 16 08:13:25 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * tty_io.c (tty_open): Don't check for an exclusive open until
+                after the device specific open routine has been called.
+                Otherwise, the serial device ref counting will be screwed
+                up.
+
+        * serial.c (rs_open, block_til_ready): Don't set termios structure
+                until after block_til_ready has returned successfully.
+                Modify block_til_ready to check the normal_termios
+                structure directly, so it doesn't rely on termios being
+                set before it's called.
+
+Thu Sep 15 23:34:01 1994  Theodore Y. Ts'o  (tytso@rt-11)
+
+        * serial.c (rs_close): Turn off interrupts during rs_close() to
+                prevent a race condition with the hangup code (which
+                runs during a software interrupt).
+
+        * tty_io.c (release_dev): Don't free the locked_termios structure;
+                its state must be retained across device opens.
+
+
+        * tty_io.c (tty_unregister_driver): Added function to unregister a
+                tty driver.  (For loadable device drivers.)
+
+