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linux/drivers
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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>
History 2009-01-02 10:19:35 -08:00
..
accessibility braille_console: only register notifiers when the braille console is used 2008-10-02 15:53:13 -07:00
acpi Merge branches 'tracing/ftrace', 'tracing/hw-branch-tracing' and 'tracing/ring-buffer'; commit 'v2.6.28' into tracing/core 2008-12-25 13:11:00 +01:00
amba Driver core: change add_uevent_var to use a struct 2007-10-12 14:51:01 -07:00
ata Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-12-30 17:43:10 -08:00
atm atm: Driver for Solos PCI ADSL2+ card. 2008-12-26 01:26:11 -08:00
auxdisplay auxdisplay: small cleanups 2008-07-24 10:47:41 -07:00
base sysfs: Fix return values for sysdev_store_{ulong,int} 2008-10-29 15:03:49 -07:00
block Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus 2008-12-30 17:37:25 -08:00
bluetooth Bluetooth: Enable per-module dynamic debug messages 2008-11-30 12:17:28 +01:00
cdrom cdrom: reduce stack usage of mmc_ioctl_dvd_read_struct 2008-12-29 08:28:43 +01:00
char n_tty: Fix loss of echoed characters and remove bkl from n_tty 2009-01-02 10:19:35 -08:00
clocksource clocksource, acpi_pm.c: put acpi_pm_read_slow() under CONFIG_PCI 2008-12-12 15:05:28 +01:00
connector CRED: Use RCU to access another task's creds and to release a task's own creds 2008-11-14 10:39:19 +11:00
cpufreq [CPUFREQ] Fix BUG: using smp_processor_id() in preemptible code 2008-10-09 13:52:44 -04:00
cpuidle regression: disable timer peek-ahead for 2.6.28 2008-11-09 16:28:42 -08:00
crypto crypto: talitos - Ack done interrupt in isr instead of tasklet 2008-12-25 11:02:33 +11:00
dca [4/4] dca: fixup initialization dependency 2008-11-10 15:01:03 -08:00
dio dio: use dio_match_device() in dio_bus_match() 2008-07-20 17:24:40 -07:00
dma async_xor: dma_map destination DMA_BIDIRECTIONAL 2008-12-08 13:46:00 -07:00
edac Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-12-28 16:54:33 -08:00
eisa driver core: remove DEVICE_NAME_SIZE define 2008-07-21 21:54:53 -07:00
firewire firewire: fw-ohci: fix IOMMU resource exhaustion 2008-12-10 12:45:34 +01:00
firmware DMI: add dmi_match 2008-12-29 07:39:34 -05:00
gpio gpiolib: extend gpio label column width in debugfs file 2008-11-19 18:49:57 -08:00
gpu drm/i915: fix modeset devname allocation + agp init return check. 2008-12-29 18:18:19 +10:00
hid HID: Apple ALU wireless keyboards are bluetooth devices 2008-11-28 15:09:26 +01:00
hwmon hwmon: applesmc: make applesmc load automatically on startup 2008-12-01 19:55:24 -08:00
i2c Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-12-30 17:36:49 -08:00
ide Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-12-30 17:36:49 -08:00
idle i7300_idle: Kconfig, show menu only on x86_64 2008-10-28 00:14:47 -04:00
ieee1394 ieee1394: add quirk fix for Freecom HDD 2008-12-14 01:13:13 +01:00
infiniband Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2008-12-30 17:45:28 -08:00
input Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-12-30 17:36:49 -08:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
leds remove unused #include <version.h>'s 2008-11-01 09:50:12 -07:00
lguest lguest: struct device - replace bus_id with dev_name() 2008-12-30 09:26:12 +10:30
macintosh Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-12-28 16:54:33 -08:00
mca driver core: remove DEVICE_NAME_SIZE define 2008-07-21 21:54:53 -07:00
md bio: allow individual slabs in the bio_set 2008-12-29 08:29:23 +01:00
media Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 2008-12-30 17:41:32 -08:00
memstick [PATCH] switch memstick 2008-10-21 07:48:33 -04:00
message [SCSI] fusion: use ARRAY_SIZE 2008-12-29 11:24:17 -06:00
mfd [ARM] Hide ISA DMA API when ISA_DMA_API is unset 2008-11-29 18:42:40 +00:00
misc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
mmc Merge branch 'rmk-devel-mxc-pu-v2' of git://pasiphae.extern.pengutronix.de/git/imx/linux-2.6 into devel 2008-12-17 20:05:39 +00:00
mtd [ARM] MX3: add NAND support 2008-12-16 14:58:02 +01:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-12-30 17:43:10 -08:00
nubus nubus: fix mis-indented statement 2008-10-16 11:21:30 -07:00
of of/gpio: Implement of_gpio_count() 2008-12-21 14:21:14 +11:00
oprofile shrink struct dentry 2008-12-31 18:07:38 -05:00
parisc netdev: introduce dev_get_stats() 2008-11-19 21:40:23 -08:00
parport parport_serial: fix array overflow 2008-12-01 19:55:24 -08:00
pci Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-12-30 16:20:19 -08:00
pcmcia Merge branch 'mxc-pu-imxfb' of git://pasiphae.extern.pengutronix.de/git/imx/linux-2.6 into devel 2008-12-17 20:04:45 +00:00
pnp drivers: remove duplicated #include 2008-11-04 08:18:19 -08:00
power Merge git://git.infradead.org/battery-2.6 2008-10-20 09:44:30 -07:00
ps3 powerpc/ps3: Replace the flip_ctl logic in ps3av and ps3fb by a mutex 2008-11-19 16:03:54 +11:00
rapidio rapidio: struct device - replace bus_id with dev_name(), dev_set_name() 2008-12-16 15:53:41 +11:00
regulator regulator: Use menuconfig in Kconfig 2008-11-09 14:49:23 +00:00
rtc Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-12-30 17:36:49 -08:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-12-30 17:43:10 -08:00
sbus Revert "of_platform_driver noise on sparce" 2008-12-01 07:55:14 -08:00
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-12-30 17:43:10 -08:00
serial Blackfin Serial Driver: Remove BI status for known_good_char 2009-01-02 10:19:35 -08:00
sh sh: maple: Do not pass SLAB_POISON to kmem_cache_create() 2008-12-16 16:40:32 +09:00
sn ioc3.c: replace remaining __FUNCTION__ occurrences 2008-03-17 08:11:48 -04:00
spi Merge git://git.marvell.com/orion into devel 2008-12-13 09:12:51 +00:00
ssb ssb: struct device - replace bus_id with dev_name(), dev_set_name() 2008-11-21 11:06:03 -05:00
staging Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
tc lk201: remove obsolete driver 2007-10-17 08:42:57 -07:00
telephony telephony: trivial: fix up email address 2008-11-11 09:30:23 -08:00
thermal thermal: Create CONFIG_THERMAL_HWMON=n 2008-06-25 19:25:42 -04:00
uio saner FASYNC handling on file close 2008-11-01 09:49:46 -07:00
usb Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-12-30 17:36:49 -08:00
uwb uwb: use the %pM formatting specifier in eda.c 2008-10-28 23:02:37 -07:00
video Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-12-30 17:36:49 -08:00
virtio virtio: add PCI device release() function 2008-12-30 09:26:10 +10:30
w1 w1: fix slave selection on big-endian systems 2008-12-23 15:58:21 -08:00
watchdog Merge branch 'for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa-linux-2.6 into devel 2008-12-29 18:08:11 +00:00
xen Merge branch 'irq-fixes-for-linus-4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-12-31 09:00:59 -08:00
zorro move memory_read_from_buffer() from fs.h to string.h 2008-07-24 10:47:13 -07:00
Kconfig regulator: Build on non-ARM platforms 2008-10-28 21:47:17 +00:00
Makefile Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/dvrabel/uwb 2008-10-26 16:35:46 -07:00