Date:	Thu, 18 Feb 2010 09:52:00 -0700
From:	Jonathan Corbet <corbet@....net>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Theodore Ts'o <tytso@....edu>, Jiri Kosina <trivial@...nel.org>
Subject: [PATCH] Remove drivers/char/ChangeLog

The ChangeLog file under drivers/char is 30K of stuff dedicated to the
mid-90's TTY exploits of Ted Ts'o; it has been updated once since 1998
- and that was in 2001.  It's interesting history, but we don't
normally carry that kind of history inline with the code.  Let's remove
it.

Signed-off-by: Jonathan Corbet <corbet@....net>

diff --git a/drivers/char/ChangeLog b/drivers/char/ChangeLog
deleted file mode 100644
index 56b8a2e..0000000
--- a/drivers/char/ChangeLog
+++ /dev/null
@@ -1,775 +0,0 @@
-2001-08-11  Tim Waugh  <twaugh@...hat.com>
-
-	* serial.c (get_pci_port): Deal with awkward Titan cards.
-
-1998-08-26  Theodore Ts'o  <tytso@...s-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@...s-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@...s-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@...s-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@...s-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@...s-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@...s-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@...s-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@...s-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@...s-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@...s-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@...s-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@...s-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@...alhost.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@...alhost.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@...s-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@...s-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@...s-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@...s-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@...s-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@...s-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@...s-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@...s-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@...s-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@....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@....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@...s-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@...s-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@...s-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@...s-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@...s-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@...-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@...alhost>
-
-	* 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@...alhost>
-
-	* 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@...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@...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@...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@...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@...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@...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@...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@...rs.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@...-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@...-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@...-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@...pol.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@...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@...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@...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@...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@...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@...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@...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@...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@...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@...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@...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@...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@...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@...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@...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@...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@...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.)
-
-
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