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SubjectRe: [PATCH 2/16 v6] PCI: define PCI resource names in an 'enum'
Date
On Wednesday 22 October 2008 02:40:41 am Yu Zhao wrote:
> This patch moves all definitions of the PCI resource names to an 'enum',
> and also replaces some hard-coded resource variables with symbol
> names. This change eases introduction of device specific resources.

Thanks for removing a bunch of magic numbers from the code.

> static void
> pci_restore_bars(struct pci_dev *dev)
> {
> - int i, numres;
> -
> - switch (dev->hdr_type) {
> - case PCI_HEADER_TYPE_NORMAL:
> - numres = 6;
> - break;
> - case PCI_HEADER_TYPE_BRIDGE:
> - numres = 2;
> - break;
> - case PCI_HEADER_TYPE_CARDBUS:
> - numres = 1;
> - break;
> - default:
> - /* Should never get here, but just in case... */
> - return;
> - }
> + int i;
>
> - for (i = 0; i < numres; i++)
> + for (i = 0; i < PCI_BRIDGE_RESOURCES; i++)
> pci_update_resource(dev, i);
> }

The behavior of this function used to depend on dev->hdr_type. Now
we don't look at hdr_type at all, so we do the same thing for all
devices.

For example, for a CardBus device, we used to call pci_update_resource()
only for BAR 0; now we call it for BARs 0-6.

Maybe this is safe, but I can't tell from the patch, so I think you
should explain *why* it's safe in the changelog.

> +/*
> + * For PCI devices, the region numbers are assigned this way:
> + */
> +enum {
> + /* #0-5: standard PCI regions */
> + PCI_STD_RESOURCES,
> + PCI_STD_RESOURCES_END = 5,
> +
> + /* #6: expansion ROM */
> + PCI_ROM_RESOURCE,
> +
> + /* address space assigned to buses behind the bridge */
> +#ifndef PCI_BRIDGE_RES_NUM
> +#define PCI_BRIDGE_RES_NUM 4
> +#endif
> + PCI_BRIDGE_RESOURCES,
> + PCI_BRIDGE_RES_END = PCI_BRIDGE_RESOURCES + PCI_BRIDGE_RES_NUM - 1,

Since you used "PCI_STD_RESOURCES_END" above, maybe you should use
"PCI_BRIDGE_RESOURCES_END" instead of "PCI_BRIDGE_RES_END".

Bjorn


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