Merge branch 'pci/misc'

  - Clarify that platform_get_irq() should never return 0 (Bjorn Helgaas)

  - Check for platform_get_irq() failure consistently (Bjorn Helgaas)

  - Replace zero-length array with flexible-array (Gustavo A. R. Silva)

  - Unify pcie_find_root_port() and pci_find_pcie_root_port() (Yicong Yang)

  - Quirk Intel C620 MROMs, which have non-BARs in BAR locations (Xiaochun
    Lee)

  - Fix pcie_pme_resume() and pcie_pme_remove() kernel-doc (Jay Fang)

  - Rename _DSM constants to align with spec (Krzysztof Wilczyński)

* pci/misc:
  PCI: Rename _DSM constants to align with spec
  PCI/PME: Fix kernel-doc of pcie_pme_resume() and pcie_pme_remove()
  x86/PCI: Mark Intel C620 MROMs as having non-compliant BARs
  PCI: Unify pcie_find_root_port() and pci_find_pcie_root_port()
  PCI: Replace zero-length array with flexible-array
  PCI: Check for platform_get_irq() failure consistently
  driver core: platform: Clarify that IRQ 0 is invalid

2 files changed, 22 insertions, 15 deletions

diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
index 11c98875538a..769cb9c9fa28 100644
--- a/include/linux/pci-acpi.h
+++ b/include/linux/pci-acpi.h
@@ -107,10 +107,12 @@ static inline void acpiphp_check_host_bridge(struct acpi_device *adev) { }
 #endif
 
 extern const guid_t pci_acpi_dsm_guid;
-#define IGNORE_PCI_BOOT_CONFIG_DSM	0x05
-#define DEVICE_LABEL_DSM		0x07
-#define RESET_DELAY_DSM			0x08
-#define FUNCTION_DELAY_DSM		0x09
+
+/* _DSM Definitions for PCI */
+#define DSM_PCI_PRESERVE_BOOT_CONFIG		0x05
+#define DSM_PCI_DEVICE_NAME			0x07
+#define DSM_PCI_POWER_ON_RESET_DELAY		0x08
+#define DSM_PCI_DEVICE_READINESS_DURATIONS	0x09
 
 #ifdef CONFIG_PCIE_EDR
 void pci_acpi_add_edr_notifier(struct pci_dev *pdev);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 5ac476c70fd7..f020eae17126 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -291,7 +291,7 @@ struct pci_cap_saved_data {
 	u16		cap_nr;
 	bool		cap_extended;
 	unsigned int	size;
-	u32		data[0];
+	u32		data[];
 };
 
 struct pci_cap_saved_state {
@@ -542,7 +542,7 @@ struct pci_host_bridge {
 			resource_size_t start,
 			resource_size_t size,
 			resource_size_t align);
-	unsigned long	private[0] ____cacheline_aligned;
+	unsigned long	private[] ____cacheline_aligned;
 };
 
 #define	to_pci_host_bridge(n) container_of(n, struct pci_host_bridge, dev)
@@ -1035,7 +1035,6 @@ void pci_bus_add_device(struct pci_dev *dev);
 void pci_read_bridge_bases(struct pci_bus *child);
 struct resource *pci_find_parent_resource(const struct pci_dev *dev,
 					  struct resource *res);
-struct pci_dev *pci_find_pcie_root_port(struct pci_dev *dev);
 u8 pci_swizzle_interrupt_pin(const struct pci_dev *dev, u8 pin);
 int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge);
 u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp);
@@ -2153,17 +2152,23 @@ static inline int pci_pcie_type(const struct pci_dev *dev)
 	return (pcie_caps_reg(dev) & PCI_EXP_FLAGS_TYPE) >> 4;
 }
 
+/**
+ * pcie_find_root_port - Get the PCIe root port device
+ * @dev: PCI device
+ *
+ * Traverse up the parent chain and return the PCIe Root Port PCI Device
+ * for a given PCI/PCIe Device.
+ */
 static inline struct pci_dev *pcie_find_root_port(struct pci_dev *dev)
 {
-	while (1) {
-		if (!pci_is_pcie(dev))
-			break;
-		if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT)
-			return dev;
-		if (!dev->bus->self)
-			break;
-		dev = dev->bus->self;
+	struct pci_dev *bridge = pci_upstream_bridge(dev);
+
+	while (bridge) {
+		if (pci_pcie_type(bridge) == PCI_EXP_TYPE_ROOT_PORT)
+			return bridge;
+		bridge = pci_upstream_bridge(bridge);
 	}
+
 	return NULL;
 }