Commit fa216bf4 authored Jul 22, 2013 by Yinghai Lu Committed by Bjorn Helgaas Jul 25, 2013

PCI: Turn on reallocation for unassigned resources with host bridge offset



Previously we did not turn on automatic PCI resource reallocation for
unassigned IOV resources behind a host bridge with address offset.  This
patch fixes that bug.

The intent was that "!r->start" would check for a BAR containing zero.  But
that check is incorrect for host bridges that apply an offset, because in
that case the resource address is not the same as the bus address.

This patch fixes that by converting the resource address back to a bus
address before checking for zero.

[bhelgaas: changelog]
Suggested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

parent 223d96fc

drivers/pci/setup-bus.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -1367,9 +1367,14 @@ static int __init iov_resources_unassigned(struct pci_dev dev, void data)

		for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
		struct resource *r = &dev->resource[i];
		struct pci_bus_region region;

		/* Not assigned or rejected by kernel? */
		if (r->flags && !r->start) {
		if (!r->flags)
		continue;

		pcibios_resource_to_bus(dev, &region, r);
		if (!region.start) {
		*unassigned = true;
		return 1; /* return early from pci_walk_bus() */
		}