From 1ed6743918abbec69c0f0b725fa56e3c3248bbab Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Thu, 29 Oct 2009 17:24:59 +0200 Subject: [PATCH] PCI: fix nit in ROM BAR size probing When probing for ROM BAR size, we should not change bits 1:10 in this BAR, because these bits are marked as "reserved for future use" in PCI spec, so changing them might have side effects. No such issue for I/O or memory, as there is an implementation note in PCI spec which explicitly allows writing 0xfffffffff there. Signed-off-by: Michael S. Tsirkin Signed-off-by: Jesse Barnes --- drivers/pci/probe.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index bb2cc39b64ff..9cefc54a0125 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -165,12 +165,12 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, { u32 l, sz, mask; - mask = type ? ~PCI_ROM_ADDRESS_ENABLE : ~0; + mask = type ? PCI_ROM_ADDRESS_MASK : ~0; res->name = pci_name(dev); pci_read_config_dword(dev, pos, &l); - pci_write_config_dword(dev, pos, mask); + pci_write_config_dword(dev, pos, l | mask); pci_read_config_dword(dev, pos, &sz); pci_write_config_dword(dev, pos, l); -- 2.20.1