diff options
| author | Bjorn Helgaas <bhelgaas@google.com> | 2016-11-29 17:14:47 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-11-29 17:14:47 +0300 |
| commit | 45d004f4afefdd8d79916ee6d97a9ecd94bb1ffe (patch) | |
| tree | 2d11b9eb2db44b9e229be0442764ae701ef8e06f /drivers/pci/setup-res.c | |
| parent | 63880b230a4af502c56dde3d4588634c70c66006 (diff) | |
| download | linux-45d004f4afefdd8d79916ee6d97a9ecd94bb1ffe.tar.xz | |
PCI: Update BARs using property bits appropriate for type
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>
Diffstat (limited to 'drivers/pci/setup-res.c')
| -rw-r--r-- | drivers/pci/setup-res.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index d2a32d88d2ae..53bc0638cac6 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -59,12 +59,17 @@ void pci_update_resource(struct pci_dev *dev, int resno) return; pcibios_resource_to_bus(dev->bus, ®ion, 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) |