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

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Message-Id: <200803180809.10020.stefan.bauer@cs.tu-chemnitz.de>
Date:	Tue, 18 Mar 2008 08:09:09 +0100
From:	Stefan Bauer <stefan.bauer@...tu-chemnitz.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
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

Am Dienstag, 18. März 2008 04:48 schrieb Andrew Morton:
> On Mon, 17 Mar 2008 16:41:10 +0100 Stefan Bauer 
<stefan.bauer@...tu-chemnitz.de> wrote:
> > 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.

Yes, yesterday I worked the whole day with that machine running -rc6 + my 
patch. The regression definitely is fixed, fbi and fbset work w/o problems or 
new regressions.

	Regards
		Stefan
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