Commit 2d237c63 authored Sep 06, 2005 by Stephane Doyon Committed by Linus Torvalds Sep 07, 2005

[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>

parent f62c6d0a

drivers/char/vt.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;