From: Michael S. Tsirkin Date: Thu, 29 Oct 2009 15:24:59 +0000 (+0200) Subject: PCI: fix nit in ROM BAR size probing X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1ed6743918abbec69c0f0b725fa56e3c3248bbab;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 --- 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);