linux-kernel - [ 42/76] video/udlfb: fix line counting in fb

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Date:	Thu, 18 Oct 2012 19:47:06 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Alexander Holler <holler@...oftware.de>,
	Bernie Thompson <bernie@...gable.com>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>
Subject: [ 42/76] video/udlfb: fix line counting in fb_write

3.6-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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/video/udlfb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/video/udlfb.c
+++ b/drivers/video/udlfb.c
@@ -647,7 +647,7 @@ static ssize_t dlfb_ops_write(struct fb_
 	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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