linux-kernel - Re: [PATCH] i810fb: Fix console switch regression

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Message-Id: <20080317204812.2c3e3754.akpm@linux-foundation.org>
Date:	Mon, 17 Mar 2008 20:48:12 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Stefan Bauer <stefan.bauer@...tu-chemnitz.de>
Cc:	linux-fbdev-devel@...ts.sourceforge.net,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Antonino Daplas <adaplas@....net>
Subject: Re: [PATCH] i810fb: Fix console switch regression

On Mon, 17 Mar 2008 16:41:10 +0100 Stefan Bauer <stefan.bauer@...tu-chemnitz.de> wrote:

> I'm sorry for the spaces in the second patch, here's a clean one with tabs.
> 
> ---
> From: Stefan Bauer <stefan.bauer@...tu-chemnitz.de>
> 
> Since 4c7ffe0b9f7f40bd818fe3af51342f64c483908e ("fbdev: prevent drivers that 
> have hardware cursors from calling software cursor code") every call of 
> i810fb_cursor fails with -ENXIO because of a incorrect "!".
> 
> This hasn't striked until eaa0ff15c30dc9799eb4d12660edb73aeb6d32c5 ("fix ! 
> versus & precedence in various places") surrounded the expression with 
> braces, so that the intended behavior was inverted. That caused 'pixel 
> waste' - the same line of multi-colored pixels repeated over the whole 
> screen - during console switch.
> 
> This switches back to the original pre-4c7ffe0 behavior.
> 
> Signed-off-by: Stefan Bauer <stefan.bauer@...tu-chemnitz.de>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Antonino Daplas <adaplas@....net>
> 
> --- linux-2.6/drivers/video/i810/i810_main.c.orig
> +++ linux-2.6/drivers/video/i810/i810_main.c
> @@ -1476,7 +1476,7 @@ static int i810fb_cursor(struct fb_info 
>  	struct i810fb_par *par = info->par;
>  	u8 __iomem *mmio = par->mmio_start_virtual;
>  
> -	if (!(par->dev_flags & LOCKUP))
> +	if (par->dev_flags & LOCKUP)
>  		return -ENXIO;
>  
>  	if (cursor->image.width > 64 || cursor->image.height > 64)

Can you please confirm that this actually fixes the bug?  That wasn't clear.

Thanks.
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