PCI: PCIe portdrv: Aviod using service devices with wrong interrupts

The PCI Express port driver should not attempt to register service
devices that require the ability to generate interrupts if generating
interrupts is not possible.  Namely, if the port has no interrupt pin
configured and we cannot set up MSI or MSI-X for it, there is no way
it can generate interrupts and in such a case the port services that
rely on interrupts (PME, PCIe HP, AER) should not be enabled for it.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 28 insertions, 13 deletions

diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 273e9761..265eba0 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -43,7 +43,7 @@ static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
 {
 	struct pcie_port_data *port_data = pci_get_drvdata(dev);
 	int i, pos, nvec, status = -EINVAL;
-	int interrupt_mode = PCIE_PORT_INTx_MODE;
+	int interrupt_mode = PCIE_PORT_NO_IRQ;
 
 	/* Set INTx as default */
 	for (i = 0, nvec = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
@@ -51,7 +51,9 @@ static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
 			nvec++;
 		vectors[i] = dev->irq;
 	}
-	
+	if (dev->pin)
+		interrupt_mode = PCIE_PORT_INTx_MODE;
+
 	/* Check MSI quirk */
 	if (port_data->port_type == PCIE_RC_PORT && pcie_mch_quirk)
 		return interrupt_mode;
@@ -141,7 +143,7 @@ static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev,
 	dev->id.vendor = parent->vendor;
 	dev->id.device = parent->device;
 	dev->id.port_type = port_type;
-	dev->id.service_type = (1 << service_type);
+	dev->id.service_type = service_type;
 
 	/* Initialize generic device interface */
 	device = &dev->device;
@@ -232,19 +234,32 @@ int pcie_port_device_register(struct pci_dev *dev)
 	/* Allocate child services if any */
 	for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
 		struct pcie_device *child;
+		int service = 1 << i;
 
-		if (capabilities & (1 << i)) {
-			child = alloc_pcie_device(dev, i, vectors[i]);
-			if (child) {
-				status = device_register(&child->device);
-				if (status) {
-					kfree(child);
-					continue;
-				}
-				get_device(&child->device);
-			}
+		if (!(capabilities & service))
+			continue;
+
+		/*
+		 * Don't use service devices that require interrupts if there is
+		 * no way to generate them.
+		 */
+		if (irq_mode == PCIE_PORT_NO_IRQ
+		    && service != PCIE_PORT_SERVICE_VC)
+			continue;
+
+		child = alloc_pcie_device(dev, service, vectors[i]);
+		if (!child)
+			continue;
+
+		status = device_register(&child->device);
+		if (status) {
+			kfree(child);
+			continue;
 		}
+
+		get_device(&child->device);
 	}
+
 	return 0;
 }