PCI: endpoint: Setting BAR_5 to 64-bits wide is invalid

Since a 64-bit BAR consists of a BAR pair, and since there is no
BAR after BAR_5, BAR_5 cannot be 64-bits wide.

This sanity check is done in pci_epc_set_bar(), so that we don't need
to do this sanity check in all epc->ops->set_bar() implementations.

Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/pci/endpoint/pci-epc-core.c

@@ -310,7 +310,9 @@ int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
 	int ret;
 	unsigned long irq_flags;
 
-	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
+	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
+	    (epf_bar->barno == BAR_5 &&
+	     epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64))
 		return -EINVAL;
 
 	if (!epc->ops->set_bar)