PCI: pciehp: Use is_pciehp instead of is_hotplug_bridge

The PCIe hotplug driver calculates the depth of a nested hotplug port by
looking at the is_hotplug_bridge flag.  The depth is used as lockdep class
to tell hotplug ports apart.

The is_hotplug_bridge flag encompasses ACPI slots handled by the ACPI
hotplug driver, hence the calculated depth may be too high.  Avoid by
checking the is_pciehp flag instead.

This glitch likely has no user-visible impact:  ACPI slots typically only
exist at the Root Port level, not in nested hotplug hierarchies.  Also,
CONFIG_LOCKDEP is usually only used by developers.  So this is just for
the sake of correctness.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/59a097376a2bb493da9efd66fb196ae4b66f8a09.1752390102.git.lukas@wunner.de

Author: l1k

drivers/pci/hotplug/pciehp_hpc.c

@@ -995,7 +995,7 @@ static inline int pcie_hotplug_depth(struct pci_dev *dev)
 
 	while (bus->parent) {
 		bus = bus->parent;
-		if (bus->self && bus->self->is_hotplug_bridge)
+		if (bus->self && bus->self->is_pciehp)
 			depth++;
 	}