PCI: microchip: Add missing chained_irq_enter()/exit() calls

Two of the chained IRQ handlers miss their
chained_irq_enter()/chained_irq_exit() calls, so add them in to avoid
potentially lost interrupts.

Reported by: Bjorn Helgaas <[e-mail]>
Link: https://lore.kernel.org/linux-pci/[e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Conor Dooley <[e-mail]>
Signed-off-by: Lorenzo Pieralisi <[e-mail]>

drivers/pci/controller/pcie-microchip-host.c

···
 static void mc_handle_msi(struct irq_desc *desc)
 {
 	struct mc_pcie *port = irq_desc_get_handler_data(desc);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
 	struct device *dev = port->dev;
 	struct mc_msi *msi = &port->msi;
 	void __iomem *bridge_base_addr =
···
 	unsigned long status;
 	u32 bit;
 	int ret;
+
+	chained_irq_enter(chip, desc);
 
 	status = readl_relaxed(bridge_base_addr + ISTATUS_LOCAL);
 	if (status & PM_MSI_INT_MSI_MASK) {
···
 						    bit);
 		}
 	}
+
+	chained_irq_exit(chip, desc);
 }
 
 static void mc_msi_bottom_irq_ack(struct irq_data *data)
···
 static void mc_handle_intx(struct irq_desc *desc)
 {
 	struct mc_pcie *port = irq_desc_get_handler_data(desc);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
 	struct device *dev = port->dev;
 	void __iomem *bridge_base_addr =
 		port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
 	unsigned long status;
 	u32 bit;
 	int ret;
+
+	chained_irq_enter(chip, desc);
 
 	status = readl_relaxed(bridge_base_addr + ISTATUS_LOCAL);
 	if (status & PM_MSI_INT_INTX_MASK) {
···
 						    bit);
 		}
 	}
+
+	chained_irq_exit(chip, desc);
 }
 
 static void mc_ack_intx_irq(struct irq_data *data)