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PCI: Update BARs using property bits appropriate for type

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The BAR property bits (0-3 for memory BARs, 0-1 for I/O BARs) are supposed
to be read-only, but we do save them in res->flags and include them when
updating the BAR.

Mask the I/O property bits with ~PCI_BASE_ADDRESS_IO_MASK (0x3) instead of
PCI_REGION_FLAG_MASK (0xf) to make it obvious that we can't corrupt bits
2-3 of I/O addresses.

Use PCI_ROM_ADDRESS_MASK for ROM BARs.  This means we'll only check the top
21 bits (instead of the 28 bits we used to check) of a ROM BAR to see if
the update was successful.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2016-11-29 08:14:47 -06:00
parent 63880b230a
commit 45d004f4af
1 changed files with 8 additions and 3 deletions
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11
drivers/pci/setup-res.c
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@ -59,12 +59,17 @@ void pci_update_resource(struct pci_dev *dev, int resno)
return;
pcibios_resource_to_bus(dev->bus, &region, res);
new = region.start;
new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
if (res->flags & IORESOURCE_IO)
if (res->flags & IORESOURCE_IO) {
mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
else
new |= res->flags & ~PCI_BASE_ADDRESS_IO_MASK;
} else if (resno == PCI_ROM_RESOURCE) {
mask = (u32)PCI_ROM_ADDRESS_MASK;
} else {
mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
new |= res->flags & ~PCI_BASE_ADDRESS_MEM_MASK;
}
reg = pci_resource_bar(dev, resno, &type);
if (!reg)