linux-kernel - Re: [PATCH] nvidiafb: fix unreachable code in nv10GetConfig

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Message-Id: <20061108121311.29dd0bda.akpm@osdl.org>
Date:	Wed, 8 Nov 2006 12:13:11 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Nathan Lynch <ntl@...ox.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net
Subject: Re: [PATCH] nvidiafb: fix unreachable code in nv10GetConfig

On Wed, 8 Nov 2006 13:55:11 -0600
Nathan Lynch <ntl@...ox.com> wrote:

> Fix binary/logical operator typo which leads to unreachable code.
> Noticed while looking at other issues; I don't have the relevant
> hardware to test this.
> 
> 
> Signed-off-by: Nathan Lynch <ntl@...ox.com>
> 
> --- linux-2.6-powerpc.git.orig/drivers/video/nvidia/nv_setup.c
> +++ linux-2.6-powerpc.git/drivers/video/nvidia/nv_setup.c
> @@ -262,7 +262,7 @@ static void nv10GetConfig(struct nvidia_
>  #endif
>  
>  	dev = pci_find_slot(0, 1);
> -	if ((par->Chipset && 0xffff) == 0x01a0) {
> +	if ((par->Chipset & 0xffff) == 0x01a0) {
>  		int amt = 0;
>  
>  		pci_read_config_dword(dev, 0x7c, &amt);

That looks like a pretty significant bug.  It'll cause the kernel to
potentially map the wrong amount of memory for all cards except the
NV_ARCH_04 type.  Has been there for over a year though.  hmm..
-
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