From 2fe2d9f47cfe1a3e66e7d087368b3d7155b04c15 Mon Sep 17 00:00:00 2001 From: Alexander Holler Date: Sat, 21 Apr 2012 00:11:07 +0200 Subject: [PATCH] video/smscufx: 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. The origin of this bug seems to have been udlfb. Signed-off-by: Alexander Holler Cc: stable@vger.kernel.org Signed-off-by: Florian Tobias Schandinat --- drivers/video/smscufx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/video/smscufx.c b/drivers/video/smscufx.c index af3ef27ad36c..f39e0690f484 100644 --- a/drivers/video/smscufx.c +++ b/drivers/video/smscufx.c @@ -904,7 +904,7 @@ static ssize_t ufx_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); -- 2.39.5