linux-kernel - Re: vt: regression caused by "Fix line garbage in virtual.."

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Message-ID: <20121119202149.46fc89c4@armhf>
Date:	Mon, 19 Nov 2012 20:21:49 +0100
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Krzysztof Mazur <krzysiek@...lesie.net>
Cc:	Alan Cox <alan@...ux.intel.com>, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: vt: regression caused by "Fix line garbage in virtual.."

On Mon, 19 Nov 2012 11:38:28 +0000
Alan Cox <alan@...ux.intel.com> wrote:

> > There are some garbage after mousedev.c not present on older kernels.
> > 
> > Reverting commit 81732c in v3.7-rc6 fixes the issue.
> 
> Then we should drop this for 3.7 until a fixed one is provided IMHO.
> Its not relevant to most platforms.

Sorry, juggling with the byte offsets and the character indexes was not
so obvious.

Here is a patch towards the kernel 3.7.

Krzysztof, may you check it?

Thanks.

--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -539,25 +539,25 @@
 {
 	unsigned short *p = (unsigned short *) vc->vc_pos;
 
-	scr_memmovew(p + nr, p, vc->vc_cols - vc->vc_x);
+	scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x) * 2);
 	scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 	vc->vc_need_wrap = 0;
 	if (DO_UPDATE(vc))
 		do_update_region(vc, (unsigned long) p,
-			(vc->vc_cols - vc->vc_x) / 2 + 1);
+			vc->vc_cols - vc->vc_x + 1);
 }
 
 static void delete_char(struct vc_data *vc, unsigned int nr)
 {
 	unsigned short *p = (unsigned short *) vc->vc_pos;
 
-	scr_memcpyw(p, p + nr, vc->vc_cols - vc->vc_x - nr);
+	scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 	scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 			nr * 2);
 	vc->vc_need_wrap = 0;
 	if (DO_UPDATE(vc))
 		do_update_region(vc, (unsigned long) p,
-			(vc->vc_cols - vc->vc_x) / 2);
+			vc->vc_cols - vc->vc_x);
 }
 
 static int softcursor_original;

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/
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