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| author | Stephane Doyon <s.doyon@videotron.ca> | 2005-09-06 15:17:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-07 16:57:31 -0700 |
| commit | 2d237c63659c098a662b1b09d43460f04c498436 (patch) | |
| tree | 08a16c34d381b4d3347e353b598ccdbcc5f46c2b /drivers | |
| parent | f62c6d0a2607b2d1fdf280d4d1467a7a6e24c67d (diff) | |
| download | linux-2d237c63659c098a662b1b09d43460f04c498436.tar.bz2 | |
[PATCH] Console blanking locking fix
I've had WARN_CONSOLE_UNLOCKED warnings when calling TIOCLINUX
TIOCL_BLANKSCREEN and TIOCL_UNBLANKSCREEN.
(I'm blind and I use a braille display. I use those functions to blank my
laptop's screen so people don't read it, and hopefully to conserve power.)
The warnings are from these places:
do_blank_screen at drivers/char/vt.c:2754 (Not tainted)
save_screen at drivers/char/vt.c:575 (Not tainted)
do_unblank_screen at drivers/char/vt.c:2822 (Not tainted)
set_palette at drivers/char/vt.c:2908 (Not tainted)
At a glance I would think the following patch ought to fix that. Tested on
one machine. Could you please tell me if this is correct and/or forward
the patch where appropriate...
Signed-off-by: Stephane Doyon <s.doyon@videotron.ca>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/vt.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c index 665103ccaee8..27b6c297906a 100644 --- a/drivers/char/vt.c +++ b/drivers/char/vt.c @@ -2272,7 +2272,9 @@ int tioclinux(struct tty_struct *tty, unsigned long arg) ret = paste_selection(tty); break; case TIOCL_UNBLANKSCREEN: + acquire_console_sem(); unblank_screen(); + release_console_sem(); break; case TIOCL_SELLOADLUT: ret = sel_loadlut(p); @@ -2317,8 +2319,10 @@ int tioclinux(struct tty_struct *tty, unsigned long arg) } break; case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */ + acquire_console_sem(); ignore_poke = 1; do_blank_screen(0); + release_console_sem(); break; case TIOCL_BLANKEDSCREEN: ret = console_blanked; |