diff options
Diffstat (limited to 'drivers/pci/msi.c')
| -rw-r--r-- | drivers/pci/msi.c | 31 |
1 files changed, 20 insertions, 11 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 434c7182d926..7a44ba467481 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -269,7 +269,8 @@ static void __pci_restore_msix_state(struct pci_dev *dev) msi_set_mask_bit(entry->irq, entry->msi_attrib.masked); } - entry = get_irq_msi(dev->first_msi_irq); + BUG_ON(list_empty(&dev->msi_list)); + entry = list_entry(dev->msi_list.next, struct msi_desc, list); pos = entry->msi_attrib.pos; pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control); control &= ~PCI_MSIX_FLAGS_MASKALL; @@ -341,7 +342,6 @@ static int msi_capability_init(struct pci_dev *dev) } entry->irq = irq; list_add(&entry->list, &dev->msi_list); - dev->first_msi_irq = irq; set_irq_msi(irq, entry); /* Set MSI enabled bits */ @@ -433,7 +433,6 @@ static int msix_capability_init(struct pci_dev *dev, avail = -EBUSY; return avail; } - dev->first_msi_irq = entries[0].vector; /* Set MSI-X enabled bits */ pci_intx(dev, 0); /* disable intx */ msix_set_enable(dev, 1); @@ -461,6 +460,14 @@ static int pci_msi_check_device(struct pci_dev* dev, int nvec, int type) if (!pci_msi_enable || !dev || dev->no_msi) return -EINVAL; + /* + * You can't ask to have 0 or less MSIs configured. + * a) it's stupid .. + * b) the list manipulation code assumes nvec >= 1. + */ + if (nvec < 1) + return -ERANGE; + /* Any bridge which does NOT route MSI transactions from it's * secondary bus to it's primary bus must set NO_MSI flag on * the secondary pci_bus. @@ -525,18 +532,17 @@ void pci_disable_msi(struct pci_dev* dev) pci_intx(dev, 1); /* enable intx */ dev->msi_enabled = 0; - entry = get_irq_msi(dev->first_msi_irq); - if (!entry || !entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) { + BUG_ON(list_empty(&dev->msi_list)); + entry = list_entry(dev->msi_list.next, struct msi_desc, list); + if (!entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) { return; } default_irq = entry->msi_attrib.default_irq; - msi_free_irq(dev, dev->first_msi_irq); + msi_free_irq(dev, entry->irq); /* Restore dev->irq to its default pin-assertion irq */ dev->irq = default_irq; - - dev->first_msi_irq = 0; } EXPORT_SYMBOL(pci_disable_msi); @@ -634,7 +640,6 @@ static void msix_free_all_irqs(struct pci_dev *dev) list_for_each_entry(entry, &dev->msi_list, list) msi_free_irq(dev, entry->irq); - dev->first_msi_irq = 0; } void pci_disable_msix(struct pci_dev* dev) @@ -664,8 +669,12 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev) if (!pci_msi_enable || !dev) return; - if (dev->msi_enabled) - msi_free_irq(dev, dev->first_msi_irq); + if (dev->msi_enabled) { + struct msi_desc *entry; + BUG_ON(list_empty(&dev->msi_list)); + entry = list_entry(dev->msi_list.next, struct msi_desc, list); + msi_free_irq(dev, entry->irq); + } if (dev->msix_enabled) msix_free_all_irqs(dev); |