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authorBjorn Helgaas <bhelgaas@google.com>2013-11-27 17:24:50 -0700
committerBjorn Helgaas <bhelgaas@google.com>2013-12-13 08:44:30 -0700
commit5b764b834ea925b7fc87df4a87a0fde95acbecb9 (patch)
treebc373ac83ea818d5c3a208a267400f6f5a4b15b8 /scripts
parentd2f54d9b3ee32bc006a7ff25d716b32feba4b522 (diff)
downloadlinux-5b764b834ea925b7fc87df4a87a0fde95acbecb9.tar.gz
PCI: Stop clearing bridge Secondary Status when setting up I/O aperture
pci_setup_bridge_io() accessed PCI_IO_BASE and PCI_IO_LIMIT using dword (32-bit) reads and writes, which also access the Secondary Status register. Since the Secondary Status register is in the upper 16 bits of the dword, and we preserved those upper 16 bits, this had the effect of clearing any of the write-1-to-clear bits that happened to be set in the Secondary Status register. That's not what we want, so use word (16-bit) accesses to update only PCI_IO_BASE and PCI_IO_LIMIT. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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