PCI: Honor firmware's device disabled status

If a device has a firmware node (DT/ACPI), and the device is marked
disabled, that is currently ignored. Add a check for this condition and
bail out creating the pci_dev.

This assumes the config space for the device can still be accessed because
they already have by this point in order to identify the device.

Link: https://lore.kernel.org/r/20230210164351.2687475-1-robh@kernel.org
Tested-by: Binbin Zhou <zhoubinbin@loongson.cn>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Liu Peibao <liupeibao@loongson.cn>
Cc: Huacai Chen <chenhuacai@loongson.cn>

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 1779582..b1d80c1 100644 (file)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1841,6 +1841,8 @@ int pci_setup_device(struct pci_dev *dev)
 
        pci_set_of_node(dev);
        pci_set_acpi_fwnode(dev);
+       if (dev->dev.fwnode && !fwnode_device_is_available(dev->dev.fwnode))
+               return -ENODEV;
 
        pci_dev_assign_slot(dev);