diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2009-10-29 17:24:59 +0200 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-11-04 08:59:40 -0800 |
| commit | 1ed6743918abbec69c0f0b725fa56e3c3248bbab (patch) | |
| tree | 01ea3d9aaf84746e42c4852c7e3c5295e1b42ce0 /drivers/pci/probe.c | |
| parent | af5a8ee05404112f38fb2904747c688bdc31a746 (diff) | |
| download | lwn-1ed6743918abbec69c0f0b725fa56e3c3248bbab.tar.gz lwn-1ed6743918abbec69c0f0b725fa56e3c3248bbab.zip | |
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 <mst@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/probe.c')
| -rw-r--r-- | drivers/pci/probe.c | 4 |
1 files 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); |