--- zzzz-none-000/linux-3.10.107/arch/powerpc/kernel/msi.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/powerpc/kernel/msi.c	2021-02-04 17:41:59.000000000 +0000
@@ -13,9 +13,12 @@
 
 #include <asm/machdep.h>
 
-int arch_msi_check_device(struct pci_dev* dev, int nvec, int type)
+int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
-	if (!ppc_md.setup_msi_irqs || !ppc_md.teardown_msi_irqs) {
+	struct pci_controller *phb = pci_bus_to_host(dev->bus);
+
+	if (!phb->controller_ops.setup_msi_irqs ||
+	    !phb->controller_ops.teardown_msi_irqs) {
 		pr_debug("msi: Platform doesn't provide MSI callbacks.\n");
 		return -ENOSYS;
 	}
@@ -24,20 +27,12 @@
 	if (type == PCI_CAP_ID_MSI && nvec > 1)
 		return 1;
 
-	if (ppc_md.msi_check_device) {
-		pr_debug("msi: Using platform check routine.\n");
-		return ppc_md.msi_check_device(dev, nvec, type);
-	}
-
-        return 0;
-}
-
-int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
-{
-	return ppc_md.setup_msi_irqs(dev, nvec, type);
+	return phb->controller_ops.setup_msi_irqs(dev, nvec, type);
 }
 
 void arch_teardown_msi_irqs(struct pci_dev *dev)
 {
-	ppc_md.teardown_msi_irqs(dev);
+	struct pci_controller *phb = pci_bus_to_host(dev->bus);
+
+	phb->controller_ops.teardown_msi_irqs(dev);
 }