Commit 3cedcc36 authored Feb 26, 2014 by Bjorn Helgaas

PCI: Don't enable decoding if BAR hasn't been assigned an address



Don't enable memory or I/O decoding if we haven't assigned or claimed the
BAR's resource.

If we enable decoding for a BAR that hasn't been assigned an address, we'll
likely cause bus conflicts.  This declines to enable decoding for resources
with IORESOURCE_UNSET.

Note that drivers can use pci_enable_device_io() or pci_enable_device_mem()
if they only care about specific types of BARs.  In that case, we don't
bother checking whether the corresponding resources are assigned or
claimed.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

parent c83bd900

drivers/pci/setup-res.c

+8 −2

Original line number	Diff line number	Diff line
		@@ -343,9 +343,15 @@ int pci_enable_resources(struct pci_dev *dev, int mask)
		(!(r->flags & IORESOURCE_ROM_ENABLE)))
		continue;

		if (r->flags & IORESOURCE_UNSET) {
		dev_err(&dev->dev, "can't enable device: BAR %d %pR not assigned\n",
		i, r);
		return -EINVAL;
		}

		if (!r->parent) {
		dev_err(&dev->dev, "device not available "
		"(can't reserve %pR)\n", r);
		dev_err(&dev->dev, "can't enable device: BAR %d %pR not claimed\n",
		i, r);
		return -EINVAL;
		}