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

[ Upstream commit 30097ef ]

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 <bhelgaas@google.com>
Link: https://lore.kernel.org/linux-pci/87h76b8nxc.wl-maz@kernel.org
Link: https://lore.kernel.org/r/20220511095504.2273799-1-conor.dooley@microchip.com
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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

@@ -406,6 +406,7 @@ static void mc_pcie_enable_msi(struct mc_pcie *port, void __iomem *base)
 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 =
@@ -414,6 +415,8 @@ static void mc_handle_msi(struct irq_desc *desc)
 	u32 bit;
 	int ret;
 
+	chained_irq_enter(chip, desc);
+
 	status = readl_relaxed(bridge_base_addr + ISTATUS_LOCAL);
 	if (status & PM_MSI_INT_MSI_MASK) {
 		status = readl_relaxed(bridge_base_addr + ISTATUS_MSI);
@@ -424,6 +427,8 @@ static void mc_handle_msi(struct irq_desc *desc)
 						    bit);
 		}
 	}
+
+	chained_irq_exit(chip, desc);
 }
 
 static void mc_msi_bottom_irq_ack(struct irq_data *data)
@@ -563,13 +568,16 @@ static int mc_allocate_msi_domains(struct mc_pcie *port)
 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) {
 		status &= PM_MSI_INT_INTX_MASK;
@@ -581,6 +589,8 @@ static void mc_handle_intx(struct irq_desc *desc)
 						    bit);
 		}
 	}
+
+	chained_irq_exit(chip, desc);
 }
 
 static void mc_ack_intx_irq(struct irq_data *data)