[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>

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;