From 45d004f4afefdd8d79916ee6d97a9ecd94bb1ffe Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Tue, 29 Nov 2016 08:14:47 -0600 Subject: 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 --- drivers/pci/setup-res.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'drivers/pci/setup-res.c') 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) -- cgit