linux-kernel - [ 033/105] video/udlfb: fix line counting in fb

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Message-Id: <20121028231547.147509823@decadent.org.uk>
Date:	Sun, 28 Oct 2012 23:16:09 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Alexander Holler <holler@...oftware.de>,
	Bernie Thompson <bernie@...gable.com>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>
Subject: [ 033/105] video/udlfb: fix line counting in fb_write

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexander Holler <holler@...oftware.de>

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@...oftware.de>
Acked-by: Bernie Thompson <bernie@...gable.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@....de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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),
 				(u32)info->var.yres);
 


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