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

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Message-Id: <1334959844-3665-1-git-send-email-holler@ahsoftware.de>
Date:	Sat, 21 Apr 2012 00:10:44 +0200
From:	Alexander Holler <holler@...oftware.de>
To:	linux-kernel@...r.kernel.org
Cc:	Bernie Thompson <bernie@...gable.com>,
	Alexander Holler <holler@...oftware.de>
Subject: [PATCH] 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.

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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