[ 3.5.yuz extended stable ] Patch "video/udlfb: fix line counting in fb_write" has been added to staging queue

Herton Ronaldo Krzesinski herton.krzesinski at canonical.com
Thu Nov 15 05:49:42 UTC 2012

This is a note to let you know that I have just added a patch titled

    video/udlfb: fix line counting in fb_write

to the linux-3.5.y-queue branch of the 3.5.yuz extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.yuz tree, see



>From b2602f177f406940014ee3afc0780f39168ec33f Mon Sep 17 00:00:00 2001
From: Alexander Holler <holler at ahsoftware.de>
Date: Tue, 14 Aug 2012 09:11:09 +0200
Subject: [PATCH] video/udlfb: fix line counting in fb_write

commit b8c4321f3d194469007f5f5f2b34ec278c264a04 upstream.

Line 0 and 1 were both written to line 0 (on the display) and all subsequent
lines had an offset of -1. The result was that the last line on the display
was never overwritten by writes to /dev/fbN.

Signed-off-by: Alexander Holler <holler at ahsoftware.de>
Acked-by: Bernie Thompson <bernie at plugable.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat at gmx.de>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
 drivers/video/udlfb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/udlfb.c b/drivers/video/udlfb.c
index 8af6414..38fcfff 100644
--- a/drivers/video/udlfb.c
+++ b/drivers/video/udlfb.c
@@ -647,7 +647,7 @@ static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf,
 	result = fb_sys_write(info, buf, count, ppos);

 	if (result > 0) {
-		int start = max((int)(offset / info->fix.line_length) - 1, 0);
+		int start = max((int)(offset / info->fix.line_length), 0);
 		int lines = min((u32)((result / info->fix.line_length) + 1),


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