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

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Date:	Wed, 10 Oct 2012 12:29:21 +0000
From:	Florian Tobias Schandinat <FlorianSchandinat@....de>
To:	Alexander Holler <holler@...oftware.de>
CC:	linux-kernel@...r.kernel.org,
	Bernie Thompson <bernie@...gable.com>,
	linux-fbdev@...r.kernel.org
Subject: Re: [PATCH RESEND] video/udlfb: fix line counting in fb_write

On 08/14/2012 07:11 AM, Alexander Holler wrote:
> 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>

As Bernie agreed but didn't send me a pull request, I applied this one.
Though the formatting was screwed up and I had to fix it...


Best regards,

Florian Tobias Schandinat


> ---
>  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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