linux-stable.git/drivers/char/vt.c, branch linux-2.6.26.y

vt: fix vc_resize locking

2008-06-06T18:29:12+00:00

Lockdep says we can't take tasklist lock or sighand lock inside ctrl_lock.

Signed-off-by: Nick Piggin 
Acked-by: Alan Cox 
Cc: Oleg Nesterov 
Cc: "Eric W. Biederman" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

vt: fix background color on line feed, DEC invert

2008-06-06T18:29:12+00:00

Original report: """I used to force my console to black-on-white by the
command `setterm -inversescreen on`.  In 2.6.26-rc4, I get lots of black
background characters."""

Another addendum to commit c9e587ab.  This was previously missed out since
I was not aware of what vc_decscnm was for.

Signed-off-by: Jan Engelhardt 
Reported-by: 
Tested-by: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

vt: fix canonical input in UTF-8 mode

2008-05-08T17:46:56+00:00

For e.g.  proper TTY canonical support, IUTF8 termios flag has to be set as
appropriate.  Linux used to not care about setting that flag for VT TTYs.

This patch fixes that by activating it according to the current mode of the
VT, and sets the default value according to the vt.default_utf8 parameter.

Signed-off-by: Samuel Thibault 
Cc: Willy Tarreau 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Basic braille screen reader support

2008-04-30T15:29:52+00:00

This adds a minimalistic braille screen reader support.  This is meant to
be used by blind people e.g.  on boot failures or when / cannot be mounted
etc and thus the userland screen readers can not work.

[akpm@linux-foundation.org: fix exports]
Signed-off-by: Samuel Thibault 
Cc: Jiri Kosina 
Cc: Dmitry Torokhov 
Acked-by: Alan Cox 
Cc: Randy Dunlap 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

consoles: switch to int put_char method

2008-04-30T15:29:46+00:00

Signed-off-by: Alan Cox 
Cc: Antonino Daplas 
Cc: Stephen Rothwell 
Cc: Kelly Daly 
Cc: Paul Mackerras 
Cc: Jiri Slaby 
Cc: Samuel Thibault 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

redo locking of tty->pgrp

2008-04-30T15:29:40+00:00

Historically tty->pgrp and friends were pid_t and the code "knew" they were
safe.  The change to pid structs opened up a few races and the removal of the
BKL in places made them quite hittable.  We put tty->pgrp under the ctrl_lock
for the tty.

Signed-off-by: Alan Cox 
Cc: Oleg Nesterov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

tty: BKL pushdown

2008-04-30T15:29:40+00:00

- Push the BKL down into the line disciplines
- Switch the tty layer to unlocked_ioctl
- Introduce a new ctrl_lock spin lock for the control bits
- Eliminate much of the lock_kernel use in n_tty
- Prepare to (but don't yet) call the drivers with the lock dropped
  on the paths that historically held the lock

BKL now primarily protects open/close/ldisc change in the tty layer

[jirislaby@gmail.com: a couple of fixes]
Signed-off-by: Alan Cox 
Signed-off-by: Jiri Slaby 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

vt: fix background color on line feed

2008-04-29T15:06:06+00:00

A command that causes a line feed while a background color is active,
such as

	perl -e 'print "x" x 60, "\e[44m", "x" x 40, "\e[0m\n"'
and
	perl -e 'print "x" x 40, "\e[44m\n", "x" x 40, "\e[0m\n"'

causes the line that was started as a result of the line feed to be completely
filled with the currently active background color instead of the default
color.

When scrolling, part of the current screen is memcpy'd/memmove'd to the new
region, and the new line(s) that will appear as a result are cleared using
memset.  However, the lines are cleared with vc->vc_video_erase_char, causing
them to be colored with the currently active background color.  This is
different from X11 terminal emulators which always paint the new lines with
the default background color (e.g.  `xterm -bg black`).

The clear operation (\e[1J and \e[2J) also use vc_video_erase_char, so a new
vc->vc_scrl_erase_char is introduced with contains the erase character used
for scrolling, which is built from vc->vc_def_color instead of vc->vc_color.

Signed-off-by: Jan Engelhardt 
Cc: "Antonino A. Daplas" 
Cc: "H. Peter Anvin" 
Cc: Alan Cox 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

VT notifier extension for accessibility

2008-04-28T15:58:32+00:00

Some accessibility modules need to be able to catch the output on the
console before the VT interpretation, and possibly swallow it.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Samuel Thibault 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

VT notifier fix for VT switch

2008-03-05T00:35:11+00:00

VT notifier callbacks need to be aware of console switches.  This is already
partially done from console_callback(), but at that time fg_console, cursor
positions, etc.  are not yet updated and hence screen readers fetch the old
values.

This adds an update notify after all of the values are updated in
redraw_screen(vc, 1).

Signed-off-by: Samuel Thibault 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds