Re: [patch] pci: revert "PCI: remove transparent bridge sizing"

[Linus Torvalds]

On Fri, 28 Mar 2008, Ivan Kokshaysky wrote:
> 
> Sounds good to me. So here we go (completely untested, just for review).
[...]
> -	/* The bridge resources are special, as their
> -	   size != alignment. Sizing routines return
> -	   required alignment in the "start" field. */
> -	align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;
> +
> +	align = resource_alignment(res);
> +	BUG_ON(!align);

Don't do the BUG_ON(). That would just cause a broken machine, and makes 
it much harder to report this issue. BUG_ON() should be used only for 
totally unfixable things.

In this case, the easy thing to do is to just return an error, possibly 
with a printk() about bogus resources (ignoring it as a resource, the way 
we do it in pdev_sort_resource()).

But other than that, the thing doesn't look horrible.

		Linus
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