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  • Bjorn Helgaas's avatar
    PCI: Support PCIe Capability Slot registers only for ports with slots · 6d3a1741
    Bjorn Helgaas authored
    Previously we allowed callers to access Slot Capabilities, Status, and
    Control for Root Ports even if the Root Port did not implement a slot.
    This seems dubious because the spec only requires these registers if a
    slot is implemented.
    It's true that even Root Ports without slots must have *space* for these
    slot registers, because the Root Capabilities, Status, and Control
    registers are after the slot registers in the capability.  However,
    for a v1 PCIe Capability, the *semantics* of the slot registers are
    undefined unless a slot is implemented.
    Signed-off-by: default avatarBjorn Helgaas <>
    Reviewed-By: default avatarJiang Liu <>
access.c 16 KB