linux-kernel - Re: [PATCH] Fix wrong /proc/iomem on SGI Altix

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Message-Id: <200703151601.l2FG1PHm002278@fcbayern.americas.sgi.com>
Date:	Thu, 15 Mar 2007 11:01:24 -0500 (CDT)
From:	John Keller <jpk@....com>
To:	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	bwalle@...e.de
Subject: Re: [PATCH] Fix wrong /proc/iomem on SGI Altix

Looks good.
Feel free to add.

Acked-by: John Keller <jpk@....com>


> 
> In sn_io_slot_fixup(), the parent is re-set from the bus to
> io(port|mem)_resource because the address is changed in a way that it's not
> child of the bus any more.
> 
> However, only the root is set but not the parent/child/sibling relationship in
> the resource tree which causes 'cat /proc/iomem' to stop after this memory
> area. Depding on the poition in the tree the iomem may be nearly completely
> empty.
> 
> Signed-off-by: Bernhard Walle <bwalle@...e.de>
> 
> ---
>  arch/ia64/sn/kernel/io_init.c |   12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> Index: b/arch/ia64/sn/kernel/io_init.c
> ===================================================================
> --- a/arch/ia64/sn/kernel/io_init.c
> +++ b/arch/ia64/sn/kernel/io_init.c
> @@ -247,10 +247,18 @@ sn_io_slot_fixup(struct pci_dev *dev)
>  		addr = ((addr << 4) >> 4) | __IA64_UNCACHED_OFFSET;
>  		dev->resource[idx].start = addr;
>  		dev->resource[idx].end = addr + size;
> +
> +		/*
> +		 * if it's already in the device structure, remove it before
> +		 * inserting
> +		 */
> +		if (dev->resource[idx].parent && dev->resource[idx].parent->child)
> +			release_resource(&dev->resource[idx]);
> +
>  		if (dev->resource[idx].flags & IORESOURCE_IO)
> -			dev->resource[idx].parent = &ioport_resource;
> +			insert_resource(&ioport_resource, &dev->resource[idx]);
>  		else
> -			dev->resource[idx].parent = &iomem_resource;
> +			insert_resource(&iomem_resource, &dev->resource[idx]);
>  		/* If ROM, mark as shadowed in PROM */
>  		if (idx == PCI_ROM_RESOURCE)
>  			dev->resource[idx].flags |= IORESOURCE_ROM_BIOS_COPY;
> -

-
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