linux-kernel - Re: [PATCH] PCI legacy resource fix

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Date:	Wed, 6 Dec 2006 13:57:15 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI legacy resource fix

On Wed, 6 Dec 2006 13:41:43 +0000
Ralf Baechle <ralf@...ux-mips.org> wrote:

> Since commit 368c73d4f689dae0807d0a2aa74c61fd2b9b075f the kernel will try
> to update the non-writeable BAR registers 0..3 of PIIX4 IDE adapters if
> pci_assign_unassigned_resources() is used to do full resource assignment
> of the bus.  This fails because in the PIIX4 these BAR registers have
> implicitly assumed values and read back as zero; it used to work because
> the kernel used to just write zero to that register the read back value
> did match what was written.
> 
> The fix is a new resource flag IORESOURCE_PCI_FIXED used to mark a
> resource as non-movable.  This will also be useful to keep other import
> system resources from being moved around - for example system consoles
> on PCI busses.
> 
> Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>

Acked-by: Alan Cox <alan@...hat.com>
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