linux-kernel - Re: [PATCH 2/2] MIPS: Malta: Fix PCI southbridge legacy resource reservations

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Message-ID: <aPfizMmOQEl0_DaG@alpha.franken.de>
Date: Tue, 21 Oct 2025 21:45:16 +0200
From: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To: "Maciej W. Rozycki" <macro@...am.me.uk>
Cc: Bjorn Helgaas <helgaas@...nel.org>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] MIPS: Malta: Fix PCI southbridge legacy resource
 reservations

On Tue, Oct 21, 2025 at 08:38:29PM +0100, Maciej W. Rozycki wrote:
> Covering the PCI southbridge legacy port I/O range with a northbridge 
> resource reservation prevents MIPS Malta platform code from claiming its 
> standard legacy resources.  This is because request_resource() calls 
> cause a clash with the previous reservation and consequently fail.
> 
> Change to using insert_resource() so as to prevent the clash, switching 
> the legacy reservations from:
> 
> 00000000-00ffffff : MSC PCI I/O
>   00000020-00000021 : pic1
>   00000070-00000077 : rtc0
>   000000a0-000000a1 : pic2
>   [...]
> 
> to:
> 
> 00000000-00ffffff : MSC PCI I/O
>   00000000-0000001f : dma1
>   00000020-00000021 : pic1
>   00000040-0000005f : timer
>   00000060-0000006f : keyboard
>   00000070-00000077 : rtc0
>   00000080-0000008f : dma page reg
>   000000a0-000000a1 : pic2
>   000000c0-000000df : dma2
>   [...]
> 
> Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>
> Fixes: ae81aad5c2e1 ("MIPS: PCI: Use pci_enable_resources()")
> Cc: stable@...r.kernel.org # v6.18+
> ---
>  arch/mips/mti-malta/malta-setup.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> linux-mips-malta-setup-insert-resource.diff
> Index: linux-macro/arch/mips/mti-malta/malta-setup.c
> ===================================================================
> --- linux-macro.orig/arch/mips/mti-malta/malta-setup.c
> +++ linux-macro/arch/mips/mti-malta/malta-setup.c
> @@ -213,7 +213,7 @@ void __init plat_mem_setup(void)
>  
>  	/* Request I/O space for devices used on the Malta board. */
>  	for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
> -		request_resource(&ioport_resource, standard_io_resources+i);
> +		insert_resource(&ioport_resource, standard_io_resources + i);
>  
>  	/*
>  	 * Enable DMA channel 4 (cascade channel) in the PIIX4 south bridge.

Acked-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>

-- 
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