linux-kernel - Re: [PATCH] atkbd: cleanup only once

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Date:	Wed, 27 Jun 2007 03:01:19 +0000
From:	"dave young" <hidave.darkstar@...il.com>
To:	dmitry.torokhov@...il.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] atkbd: cleanup only once

2007/6/27, Dave Young <hidave.darkstar@...il.com>:
> Hi,
>
> If you press ctrl+alt+del several times as kernel booting (before user level bootin), the kernel will oops. I found the ps2_command is called more than once, then the ps2dev->serio maybe NULL pointer.
>
> 2.6.22-rc5 and 2.6.22-rc6 have same result.
>
> Signed-off-by: Dave Young <hidave.darkstar@...il.com>
> ---
> diff -upr linux/drivers/input/keyboard/atkbd.c linux.new/drivers/input/keyboard/atkbd.c
> --- linux/drivers/input/keyboard/atkbd.c        2007-06-27 10:38:37.000000000 +0000
> +++ linux.new/drivers/input/keyboard/atkbd.c    2007-06-27 10:37:39.000000000 +0000
> @@ -795,6 +795,11 @@ static int atkbd_activate(struct atkbd *
>
>  static void atkbd_cleanup(struct serio *serio)
>  {
> +       static int flag;
> +
> +       if(flag)
> +               return;
> +       flag = 1;
>         struct atkbd *atkbd = serio_get_drvdata(serio);
>         ps2_command(&atkbd->ps2dev, NULL, ATKBD_CMD_RESET_BAT);
>  }
>
> Regards
> dave
>
attached please find the oops screen image.

Download attachment "screen.jpg" of type "image/jpeg" (117541 bytes)