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linux/drivers/char
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Joe Peterson a88a69c912 n_tty: Fix loss of echoed characters and remove bkl from n_tty 
Fixes the loss of echoed (and other ldisc-generated characters) when
the tty is stopped or when the driver output buffer is full (happens
frequently for input during continuous program output, such as ^C)
and removes the Big Kernel Lock from the N_TTY line discipline.

Adds an "echo buffer" to the N_TTY line discipline that handles all
ldisc-generated output (including echoed characters).  Along with the
loss of characters, this also fixes the associated loss of sync between
tty output and the ldisc state when characters cannot be immediately
written to the tty driver.

The echo buffer stores (in addition to characters) state operations that need
to be done at the time of character output (like management of the column
position).  This allows echo to cooperate correctly with program output,
since the ldisc state remains consistent with actual characters written.

Since the echo buffer code now isolates the tty column state code
to the process_out* and process_echoes functions, we can remove the
Big Kernel Lock (BKL) and replace it with mutex locks.

Highlights are:

* Handles echo (and other ldisc output) when tty driver buffer is full
  - continuous program output can block echo
* Saves echo when tty is in stopped state (e.g. ^S)
  - (e.g.: ^Q will correctly cause held characters to be released for output)
* Control character pairs (e.g. "^C") are treated atomically and not
  split up by interleaved program output
* Line discipline state is kept consistent with characters sent to
  the tty driver
* Remove the big kernel lock (BKL) from N_TTY line discipline

Signed-off-by: Joe Peterson <joe@skyrush.com>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-02 10:19:35 -08:00
..
agp agp/intel: Fix broken ® symbol in device name. 2008-12-29 10:06:20 +10:00
hw_random Tidy up addresses in random drivers 2008-10-27 08:39:52 -07:00
ip2 device create: char: convert device_create_drvdata to device_create 2008-10-16 09:24:42 -07:00
ipmi Fix platform drivers that crash on suspend/resume 2008-11-12 17:17:16 -08:00
mwave mwave: ioctl BKL pushdown 2008-07-25 10:53:43 -07:00
pcmcia pcmcia: IRQ_TYPE_EXCLUSIVE is long obsoleted 2008-10-17 23:07:10 +02:00
rio rio: push down the BKL into the firmware ioctl handler 2008-07-25 10:53:43 -07:00
tpm tpm: don't export static functions 2008-10-20 08:50:24 -07:00
xilinx_hwicap xilinx_hwicap: remove improper wording in license statement 2008-12-17 11:23:07 -08:00
.gitignore
amiserial.c m68k: Disable Amiga serial console support if modular 2008-10-26 12:11:21 -07:00
apm-emulation.c APM emulation: Notify about all suspend events, not just APM invoked ones (v2) 2008-07-16 23:27:02 +02:00
applicom.c applicom.c: fix apparently-broken code in do_ac_read() 2008-10-16 11:21:47 -07:00
applicom.h
bfin-otp.c
briq_panel.c briq_panel: BKL pushdown 2008-06-20 14:05:55 -06:00
bsr.c powerpc/BSR: Support multiple OF-node description of BSR 2008-12-03 21:03:27 +11:00
cd1865.h
ChangeLog
consolemap.c Basic braille screen reader support 2008-04-30 08:29:52 -07:00
cp437.uni unicode table for cp437 2008-12-13 11:25:49 -08:00
cs5535_gpio.c Add a bunch of cycle_kernel_lock() calls 2008-06-20 14:05:53 -06:00
cyclades.c Char: cyclades. remove bogus iomap 2008-10-13 09:51:38 -07:00
defkeymap.c_shipped
defkeymap.map
digi1.h
digiFep1.h
digiPCI.h
ds1302.c rtc: use bcd2bin/bin2bcd 2008-10-20 08:52:41 -07:00
ds1620.c [ARM] netwinder: clean up GPIO naming 2008-12-13 09:12:07 +00:00
dsp56k.c device create: char: convert device_create_drvdata to device_create 2008-10-16 09:24:42 -07:00
dtlk.c Add a bunch of cycle_kernel_lock() calls 2008-06-20 14:05:53 -06:00
efirtc.c drivers/char/efirtc.c: removed duplicated #include 2008-08-04 16:59:56 -07:00
epca.c epca: Add infinite break support 2008-10-20 09:41:06 -07:00
epca.h epca: use tty_port 2008-07-20 17:12:36 -07:00
epcaconfig.h
esp.c tty: rework break handling 2008-07-22 13:03:28 -07:00
generic_nvram.c driver/char/generic_nvram: fix banner 2008-06-12 18:05:41 -07:00
generic_serial.c tty: Remove lots of NULL checks 2008-10-13 09:51:44 -07:00
genrtc.c genrtc: BKL pushdown 2008-06-20 14:05:57 -06:00
hangcheck-timer.c
hpet.c x86: correct link to HPET timer specification 2008-11-24 10:05:12 +01:00
hvc_beat.c
hvc_console.c virtio_console: support console resizing 2008-12-30 09:26:10 +10:30
hvc_console.h powerpc: Make open count variables signed in hvcs/hvsi/hvc_console 2008-12-03 21:04:13 +11:00
hvc_irq.c hvc_console: Add a hangup notifier for backends 2008-10-22 10:59:54 +11:00
hvc_iseries.c drivers/hvc: Add missing of_node_put 2008-12-03 21:04:09 +11:00
hvc_iucv.c [S390] s390/hvc_console: z/VM IUCV hypervisor console support 2008-12-25 13:39:03 +01:00
hvc_rtas.c
hvc_udbg.c powerpc: udbg-based backend for hvc_console 2008-11-19 16:04:25 +11:00
hvc_vio.c drivers/hvc: Add missing of_node_put 2008-12-03 21:04:09 +11:00
hvc_xen.c hvc_console: Add a hangup notifier for backends 2008-10-22 10:59:54 +11:00
hvcs.c powerpc: Make open count variables signed in hvcs/hvsi/hvc_console 2008-12-03 21:04:13 +11:00
hvsi.c powerpc: Make open count variables signed in hvcs/hvsi/hvc_console 2008-12-03 21:04:13 +11:00
i8k.c i8k: make fan multiplier tunable with a module parameter 2008-05-01 08:04:00 -07:00
isicom.c tty: trivial - fix up email addresses in tty related stuff 2008-11-11 09:30:10 -08:00
istallion.c istallion section warnings 2008-11-30 10:03:36 -08:00
Kconfig Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-12-28 16:54:33 -08:00
keyboard.c Input: keyboard - fix potential out of bound access to key_map 2008-10-08 23:45:36 -04:00
lp.c device create: char: convert device_create_drvdata to device_create 2008-10-16 09:24:42 -07:00
Makefile Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-12-28 16:54:33 -08:00
mbcs.c mbcs: cdev lock_kernel() pushdown 2008-06-20 14:05:48 -06:00
mbcs.h
mem.c device create: char: convert device_create_drvdata to device_create 2008-10-16 09:24:42 -07:00
misc.c device create: char: convert device_create_drvdata to device_create 2008-10-16 09:24:42 -07:00
mmtimer.c mmtimer: Push BKL down into the ioctl handler 2008-07-17 11:34:49 -07:00
moxa.c char: moxa.c sparse annotation 2008-10-16 11:21:47 -07:00
moxa.h
mspec.c mspec: convert nopfn to fault 2008-07-24 10:47:14 -07:00
mxser.c tty: trivial - fix up email addresses in tty related stuff 2008-11-11 09:30:10 -08:00
mxser.h mxser: convert large macros to functions 2008-04-30 08:29:49 -07:00
n_hdlc.c tty: some ICANON magic is in the wrong places 2008-10-13 09:51:44 -07:00
n_r3964.c tty: Remove lots of NULL checks 2008-10-13 09:51:44 -07:00
n_tty.c n_tty: Fix loss of echoed characters and remove bkl from n_tty 2009-01-02 10:19:35 -08:00
nozomi.c nozomi: Fix close on error 2008-10-13 09:51:39 -07:00
nsc_gpio.c
nvram.c [PATCH] nvram - convert PRINT_PROC to seq_file 2008-11-11 09:56:00 +00:00
nwbutton.c
nwbutton.h
nwflash.c [ARM] netwinder: clean up GPIO naming 2008-12-13 09:12:07 +00:00
pc8736x_gpio.c pc8736x_gpio: add support for PC87365 chips 2008-10-20 08:52:40 -07:00
ppdev.c device create: char: convert device_create_drvdata to device_create 2008-10-16 09:24:42 -07:00
ps3flash.c
pty.c pty: simplify unix98 allocation 2008-10-13 09:51:44 -07:00
random.c sparse irq_desc[] array: core kernel and x86 changes 2008-12-08 14:31:51 +01:00
raw.c [PATCH] kill the rest of struct file propagation in block ioctls 2008-10-21 07:49:14 -04:00
riscom8.c riscom8: Restore driver using new break functionality 2008-07-22 13:03:28 -07:00
riscom8.h tty: add more tty_port fields 2008-07-20 17:12:38 -07:00
riscom8_reg.h
rocket.c tty: rework break handling 2008-07-22 13:03:28 -07:00
rocket.h tty: add more tty_port fields 2008-07-20 17:12:38 -07:00
rocket_int.h tty: add more tty_port fields 2008-07-20 17:12:38 -07:00
rtc.c saner FASYNC handling on file close 2008-11-01 09:49:46 -07:00
scc.h
scx200_gpio.c Add a bunch of cycle_kernel_lock() calls 2008-06-20 14:05:53 -06:00
selection.c tty: Ldisc revamp 2008-07-20 17:12:34 -07:00
ser_a2232.c m68k: gs: use tty_port fixes 2008-07-26 20:29:03 -07:00
ser_a2232.h
ser_a2232fw.ax
ser_a2232fw.h
serial167.c Fix incorrect use of loose in tty/serial drivers 2008-12-05 13:40:52 -08:00
snsc.c device create: char: convert device_create_drvdata to device_create 2008-10-16 09:24:42 -07:00
snsc.h
snsc_event.c byteorder: don't directly include linux/byteorder/generic.h 2008-05-16 12:01:45 -07:00
sonypi.c Merge branch 'misc' into release 2008-11-11 21:14:11 -05:00
specialix.c Create/use more directory structure in the Documentation/ tree. 2008-11-14 17:28:53 +00:00
specialix_io8.h tty: add more tty_port fields 2008-07-20 17:12:38 -07:00
stallion.c device create: char: convert device_create_drvdata to device_create 2008-10-16 09:24:42 -07:00
sx.c Char: sx, remove bogus iomap 2008-10-20 08:52:36 -07:00
sx.h
sxboards.h
sxwindow.h
synclink.c Merge branch 'for-jeff' of git://git.kernel.org/pub/scm/linux/kernel/git/chris/linux-2.6 into tmp 2008-08-07 04:05:46 -04:00
synclink_gt.c removed unused #include <version.h> 2008-08-16 17:21:58 -07:00
synclinkmp.c Merge branch 'for-jeff' of git://git.kernel.org/pub/scm/linux/kernel/git/chris/linux-2.6 into tmp 2008-08-07 04:05:46 -04:00
sysrq.c ftrace: sysrq-z to dump the buffers 2008-11-04 11:01:35 +01:00
tb0219.c Add a bunch of cycle_kernel_lock() calls 2008-06-20 14:05:53 -06:00
tlclk.c tlckl: BKL pushdown 2008-06-20 14:05:51 -06:00
toshiba.c toshiba: use ioremap_cached 2008-04-30 23:15:34 +02:00
tty_audit.c Audit: Log TIOCSTI 2008-12-09 20:32:06 +11:00
tty_buffer.c tty: split the buffering from tty_io 2008-10-13 09:51:40 -07:00
tty_io.c n_tty: Fix loss of echoed characters and remove bkl from n_tty 2009-01-02 10:19:35 -08:00
tty_ioctl.c tty: some ICANON magic is in the wrong places 2008-10-13 09:51:44 -07:00
tty_ldisc.c try harder to load tty ldisc driver 2008-08-01 12:50:15 -07:00
tty_port.c tty: Fix tty_port kref screwup 2008-10-23 09:20:53 -07:00
vc_screen.c device create: char: convert device_create_drvdata to device_create 2008-10-16 09:24:42 -07:00
viotape.c device create: char: convert device_create_drvdata to device_create 2008-10-16 09:24:42 -07:00
virtio_console.c virtio_console: support console resizing 2008-12-30 09:26:10 +10:30
vme_scc.c m68k: gs: use tty_port fixes 2008-07-26 20:29:03 -07:00
vr41xx_giu.c drivers/char: use nr_irqs 2008-10-16 16:52:05 +02:00
vt.c n_tty: Fix loss of echoed characters and remove bkl from n_tty 2009-01-02 10:19:35 -08:00
vt_ioctl.c tty: move tioclinux from a special case 2008-10-13 09:51:40 -07:00