From 8863ada9c47503bb93eba5e3a9ba88e6311db31f Mon Sep 17 00:00:00 2001
From: Jason Wessel <jason.wessel@windriver.com>
Date: Wed, 1 Dec 2010 13:01:01 -0600
Subject: [PATCH] kgdboc,input: Fix regression with keyboard release key and
early debugging
The commit 111c182340cd22e238ab1cc6564df336c6ebd7cb (kgdboc: reset
input devices (keyboards) when exiting debugger) introduced a
regression in early debugging such that you get a kernel oops on
continue (with the go command) if you boot a kernel with:
earlyprintk=vga ekgdboc=kbd kgdbwait
The restore kgdboc_restore_input() routine schedules work for the
purpose of sending key release events for any keys that were in the
depressed state prior to entering the kernel debugger. A simple fix
to the crash is to not invoke the schedule_work() if the kernel
system_state is anything other than SYSTEM_RUNNING.
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Sergei Shtylyov <sshtylyov@mvista.com>
---
drivers/serial/kgdboc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/serial/kgdboc.c b/drivers/serial/kgdboc.c
index 3374618300af87..25a8bc565f400b 100644
--- a/drivers/serial/kgdboc.c
+++ b/drivers/serial/kgdboc.c
@@ -90,7 +90,8 @@ static DECLARE_WORK(kgdboc_restore_input_work, kgdboc_restore_input_helper);
static void kgdboc_restore_input(void)
{
- schedule_work(&kgdboc_restore_input_work);
+ if (likely(system_state == SYSTEM_RUNNING))
+ schedule_work(&kgdboc_restore_input_work);
}
static int kgdboc_register_kbd(char **cptr)
--
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