diff options
Diffstat (limited to 'drivers/char/ChangeLog')
| -rw-r--r-- | drivers/char/ChangeLog | 775 |
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.) + + |