* Re: [PATCH] vt: do not update when the console is blanked
[not found] <4877732A.5030106@eu.citrix.com>
@ 2008-07-13 5:11 ` Andrew Morton
0 siblings, 0 replies; only message in thread
From: Andrew Morton @ 2008-07-13 5:11 UTC (permalink / raw)
To: Stefano Stabellini; +Cc: linux-fbdev-devel, linux-kernel
(cc linux-fbdev-devel)
On Fri, 11 Jul 2008 15:50:18 +0100 Stefano Stabellini <stefano.stabellini@eu.citrix.com> wrote:
> Hi all,
> vt.c DO_UPDATE macro checks if the console is visible but doesn't check if
> the console is blanked.
> In fact updating fbcon while the console is blanked is not only unnecessary
> but can even cause screen corruption.
> Therefore I am adding a simple check on console_blanked in DO_UPDATE.
>
> Signed-off-by: stefano.stabellini@eu.citrix.com
>
> ---
>
> diff --git a/drivers/char/vt.c b/drivers/char/vt.c
> index 935f1c2..8d4bd3c 100644
> --- a/drivers/char/vt.c
> +++ b/drivers/char/vt.c
> @@ -261,7 +261,7 @@ static void notify_update(struct vc_data *vc)
> #ifdef VT_BUF_VRAM_ONLY
> #define DO_UPDATE(vc) 0
> #else
> -#define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
> +#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
> #endif
>
> static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
>
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