linux-kernel - [PATCH 2/2] panic: do not unblank_screen when panic

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Date:	Mon, 20 Jun 2011 16:22:09 -0700
From:	Mandeep Singh Baines <msb@...omium.org>
To:	linux-kernel@...r.kernel.org
Cc:	Mandeep Singh Baines <msb@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Huang Ying <ying.huang@...el.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Hugh Dickins <hughd@...omium.org>,
	Olaf Hering <olaf@...fle.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Dave Airlie <airlied@...il.com>
Subject: [PATCH 2/2] panic: do not unblank_screen when panic_timeout < 0

Avoid risk (of screen_unblank) and wasted cycles unblanking if
you intend to reboot immediately.

Signed-off-by: Mandeep Singh Baines <msb@...omium.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Huang Ying <ying.huang@...el.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Hugh Dickins <hughd@...omium.org>
Cc: Olaf Hering <olaf@...fle.de>
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
Cc: Dave Airlie <airlied@...il.com>
---
 lib/bust_spinlocks.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/lib/bust_spinlocks.c b/lib/bust_spinlocks.c
index 9681d54..6a5c7e0 100644
--- a/lib/bust_spinlocks.c
+++ b/lib/bust_spinlocks.c
@@ -21,7 +21,8 @@ void __attribute__((weak)) bust_spinlocks(int yes)
 		++oops_in_progress;
 	} else {
 #ifdef CONFIG_VT
-		unblank_screen();
+		if (panic_timeout >= 0)
+			unblank_screen();
 #endif
 		console_unblank();
 		if (--oops_in_progress == 0)
-- 
1.7.3.1

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