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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 its 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.)
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