powerpc/eeh: Remove eeh_add_device_tree_late()

On pseries and PowerNV pcibios_bus_add_device() calls eeh_add_device_late()
so there's no need to do a separate tree traversal to bind the eeh_dev and
pci_dev together setting up the PHB at boot. As a result we can remove
eeh_add_device_tree_late().
Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200306073904.4737-2-oohall@gmail.com

arch/powerpc/include/asm/eeh.h

@@ -304,7 +304,6 @@ void eeh_addr_cache_init(void);
 void eeh_add_device_early(struct pci_dn *);
 void eeh_add_device_tree_early(struct pci_dn *);
 void eeh_add_device_late(struct pci_dev *);
-void eeh_add_device_tree_late(struct pci_bus *);
 void eeh_remove_device(struct pci_dev *);
 int eeh_unfreeze_pe(struct eeh_pe *pe);
 int eeh_pe_reset_and_recover(struct eeh_pe *pe);
@@ -365,8 +364,6 @@ static inline void eeh_add_device_tree_early(struct pci_dn *pdn) { }
 
 static inline void eeh_add_device_late(struct pci_dev *dev) { }
 
-static inline void eeh_add_device_tree_late(struct pci_bus *bus) { }
-
 static inline void eeh_remove_device(struct pci_dev *dev) { }
 
 #define EEH_POSSIBLE_ERROR(val, type) (0)

arch/powerpc/kernel/eeh.c

@@ -1213,31 +1213,6 @@ void eeh_add_device_late(struct pci_dev *dev)
 	eeh_sysfs_add_device(dev);
 }
 
-/**
- * eeh_add_device_tree_late - Perform EEH initialization for the indicated PCI bus
- * @bus: PCI bus
- *
- * This routine must be used to perform EEH initialization for PCI
- * devices which are attached to the indicated PCI bus. The PCI bus
- * is added after system boot through hotplug or dlpar.
- */
-void eeh_add_device_tree_late(struct pci_bus *bus)
-{
-	struct pci_dev *dev;
-
-	if (eeh_has_flag(EEH_FORCE_DISABLED))
-		return;
-	list_for_each_entry(dev, &bus->devices, bus_list) {
-		eeh_add_device_late(dev);
-		if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
-			struct pci_bus *subbus = dev->subordinate;
-			if (subbus)
-				eeh_add_device_tree_late(subbus);
-		}
-	}
-}
-EXPORT_SYMBOL_GPL(eeh_add_device_tree_late);
-
 /**
  * eeh_remove_device - Undo EEH setup for the indicated pci device
  * @dev: pci device to be removed

arch/powerpc/kernel/of_platform.c

@@ -80,9 +80,6 @@ static int of_pci_phb_probe(struct platform_device *dev)
 	 */
 	pcibios_claim_one_bus(phb->bus);
 
-	/* Finish EEH setup */
-	eeh_add_device_tree_late(phb->bus);
-
 	/* Add probed PCI devices to the device model */
 	pci_bus_add_devices(phb->bus);
 

arch/powerpc/kernel/pci-common.c

@@ -1399,9 +1399,6 @@ void pcibios_finish_adding_to_bus(struct pci_bus *bus)
 			pci_assign_unassigned_bus_resources(bus);
 	}
 
-	/* Fixup EEH */
-	eeh_add_device_tree_late(bus);
-
 	/* Add new devices to global lists.  Register in proc, sysfs. */
 	pci_bus_add_devices(bus);
 }