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Matthew found that 3.8.3 is having problems with an old (ancient) PCI-to-EISA bridge, the Intel 82375. It worked with the 3.2 kernel. He identified the 82375, but doesn't assign the struct resource *res pointer inside the struct eisa_root_device, and panics. pci_eisa_init() was using bus->resource[] directly instead of pci_bus_resource_n(). The bus->resource[] array is a PCI-internal implementation detail, and after commit 45ca9e9 (PCI: add helpers for building PCI bus resource lists) and commit 0efd5aa (PCI: add struct pci_host_bridge_window with CPU/bus address offset), bus->resource[] is not used for PCI root buses any more. The 82375 is a subtractive-decode PCI device, so handle it the same way we handle PCI-PCI bridges in subtractive-decode mode in pci_read_bridge_bases(). [bhelgaas: changelog] Reported-by: Matthew Whitehead <[email protected]> Tested-by: Matthew Whitehead <[email protected]> Signed-off-by: Yinghai Lu <[email protected]> Signed-off-by: Bjorn Helgaas <[email protected]> Cc: [email protected] # v3.3+
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