--- zzzz-none-000/linux-4.1.52/drivers/pci/msi.c	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/drivers/pci/msi.c	2022-03-02 11:37:13.000000000 +0000
@@ -121,9 +121,16 @@
 
 int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
+#if defined(CONFIG_BCM_KF_MISC_BACKPORTS)
+	struct msi_controller *chip = pci_msi_controller(dev);
+#endif
 	struct msi_desc *entry;
 	int ret;
 
+#if defined(CONFIG_BCM_KF_MISC_BACKPORTS)
+	if (chip && chip->setup_irqs)
+		return chip->setup_irqs(chip, dev, nvec, type);
+#endif
 	/*
 	 * If an architecture wants to support multiple MSI, it needs to
 	 * override arch_setup_msi_irqs()