[PATCH] console blanking oops fix

When significant delays happen during boot (e.g.  with a kernel debugger,
but the problem has also seen in other cases) the timeout for blanking the
console may trigger, but the work scheduler may not have been initialized,
yet.  schedule_work() will oops over the null keventd_wq.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index e5ef1dfc54826a33b4b86e9347b8584087bda831..d7aa7a29f67e888c5f2b1946245ef84f60c47783 100644 (file)
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2867,6 +2867,10 @@ void unblank_screen(void)
  */
 static void blank_screen_t(unsigned long dummy)
 {
+       if (unlikely(!keventd_up())) {
+               mod_timer(&console_timer, jiffies + blankinterval);
+               return;
+       }
        blank_timer_expired = 1;
        schedule_work(&console_work);
 }