From f118c0c3cff4fed39bde1863f9d59850719645cc Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Tue, 13 Jan 2009 14:42:01 +0100 Subject: [PATCH] PCI: PCIe portdrv: Do not enable port device before setting up interrupts The PCI Express port driver calls pci_enable_device() before setting up interrupts, which is wrong, because if there is an interrupt pin configured for the port, pci_enable_device() will likely set up an interrupt link for it. However, this shouldn't be done if either MSI or MSI-X interrupt mode is chosen for the port. The solution is to call pci_enable_device() after setting up interrupts, because in that case the interrupt link won't be set up if MSI or MSI-X are enabled. Signed-off-by: Rafael J. Wysocki Signed-off-by: Jesse Barnes --- drivers/pci/pcie/portdrv_core.c | 38 ++++++++++++++++++++++++++++---------- drivers/pci/pcie/portdrv_pci.c | 11 +++-------- 2 files changed, 31 insertions(+), 18 deletions(-) diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c index 265eba0..91ecbc4 100644 --- a/drivers/pci/pcie/portdrv_core.c +++ b/drivers/pci/pcie/portdrv_core.c @@ -208,7 +208,7 @@ int pcie_port_device_probe(struct pci_dev *dev) int pcie_port_device_register(struct pci_dev *dev) { struct pcie_port_data *port_data; - int status, capabilities, irq_mode, i; + int status, capabilities, irq_mode, i, nr_serv; int vectors[PCIE_PORT_DEVICE_MAXSERVICES]; u16 reg16; @@ -229,24 +229,32 @@ int pcie_port_device_register(struct pci_dev *dev) capabilities |= PCIE_PORT_SERVICE_PME; irq_mode = assign_interrupt_mode(dev, vectors, capabilities); + if (irq_mode == PCIE_PORT_NO_IRQ) { + /* + * Don't use service devices that require interrupts if there is + * no way to generate them. + */ + if (!(capabilities & PCIE_PORT_SERVICE_VC)) { + status = -ENODEV; + goto Error; + } + capabilities = PCIE_PORT_SERVICE_VC; + } port_data->port_irq_mode = irq_mode; + status = pci_enable_device(dev); + if (status) + goto Error; + pci_set_master(dev); + /* Allocate child services if any */ - for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) { + for (i = 0, nr_serv = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) { struct pcie_device *child; int service = 1 << i; 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; @@ -258,9 +266,19 @@ int pcie_port_device_register(struct pci_dev *dev) } get_device(&child->device); + nr_serv++; + } + if (!nr_serv) { + pci_disable_device(dev); + status = -ENODEV; + goto Error; } return 0; + + Error: + kfree(port_data); + return status; } #ifdef CONFIG_PM diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c index 5ea566e..d17611f 100644 --- a/drivers/pci/pcie/portdrv_pci.c +++ b/drivers/pci/pcie/portdrv_pci.c @@ -82,18 +82,13 @@ static int __devinit pcie_portdrv_probe (struct pci_dev *dev, if (status) return status; - if (pci_enable_device(dev) < 0) - return -ENODEV; - - pci_set_master(dev); if (!dev->irq && dev->pin) { dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; " "check vendor BIOS\n", dev->vendor, dev->device); } - if (pcie_port_device_register(dev)) { - pci_disable_device(dev); - return -ENOMEM; - } + status = pcie_port_device_register(dev); + if (status) + return status; pcie_portdrv_save_config(dev); -- 2.7.4