linux-kernel - Re: [PATCH] Workaround for a PCI restoring bug

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Date:	Sat, 12 May 2007 23:47:43 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Lukas Hejtmanek <xhejtman@....muni.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Workaround for a PCI restoring bug

On Sat, 12 May 2007 22:12:37 +0200 Lukas Hejtmanek <xhejtman@....muni.cz> wrote:

> as of 2.6.21-git16, the bugs related to restoring PCI are still present. The
> save pci function reads only -1 from the PCI config space and when restoring,
> it messes up totaly most PCI devices. The attached patch is workaround only
> until proper fix is found and included. Could it be included into the mainline
> for now?
> 
> -- 
> Lukáš Hejtmánek
> 
> 
> [pci.patch  text/x-diff (489B)]
> --- drivers/pci/pci.c.orig	2006-07-15 23:53:08.000000000 +0200
> +++ drivers/pci/pci.c	2006-07-21 00:51:07.000000000 +0200
> @@ -477,7 +477,7 @@
>  	 */
>  	for (i = 15; i >= 0; i--) {
>  		pci_read_config_dword(dev, i * 4, &val);
> -		if (val != dev->saved_config_space[i]) {
> +		if (val != dev->saved_config_space[i] && dev->saved_config_space[i] != 0xffffffff) {
>  			printk(KERN_DEBUG "PM: Writing back config space on "
>  				"device %s at offset %x (was %x, writing %x)\n",
>  				pci_name(dev), i,

This change might indeed be a suitable workaround for some busted hardware,
but we'd need to know quite a bit about the problem before we could merge
anything like this

So, again, please send a full bug report.  An emailed one would be OK in
this case.

Thanks.
-
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