• 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: 's avatarBjorn Helgaas <bhelgaas@google.com>
    Reviewed-By: 's avatarJiang Liu <jiang.liu@huawei.com>
access.c 16 KB