linux-kernel - [PATCH RESEND] video/udlfb: fix line counting in fb

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Message-ID: <5029FA0D.1090107@ahsoftware.de>
Date:	Tue, 14 Aug 2012 09:11:09 +0200
From:	Alexander Holler <holler@...oftware.de>
To:	linux-kernel@...r.kernel.org
CC:	Bernie Thompson <bernie@...gable.com>,
	Alexander Holler <holler@...oftware.de>,
	linux-fbdev@...r.kernel.org
Subject: [PATCH RESEND] video/udlfb: fix line counting in fb_write

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.

Cc: stable@...r.kernel.org
Signed-off-by: Alexander Holler <holler@...oftware.de>
---
  drivers/video/udlfb.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/video/udlfb.c b/drivers/video/udlfb.c
index a159b63..85d8110 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);
  -- 1.7.6.5

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