diff options
Diffstat (limited to 'drivers/pci/msi.c')
| -rw-r--r-- | drivers/pci/msi.c | 27 |
1 files changed, 12 insertions, 15 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 338b027ea65f..5f1e5dc994cf 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -796,25 +796,24 @@ out_free: } /** - * pci_msi_check_device - check whether MSI may be enabled on a device + * pci_msi_supported - check whether MSI may be enabled on a device * @dev: pointer to the pci_dev data structure of MSI device function * @nvec: how many MSIs have been requested ? - * @type: are we checking for MSI or MSI-X ? * * Look at global flags, the device itself, and its parent buses * to determine if MSI/-X are supported for the device. If MSI/-X is - * supported return 0, else return an error code. + * supported return 1, else return 0. **/ -static int pci_msi_check_device(struct pci_dev *dev, int nvec) +static int pci_msi_supported(struct pci_dev *dev, int nvec) { struct pci_bus *bus; /* MSI must be globally enabled and supported by the device */ if (!pci_msi_enable) - return -EINVAL; + return 0; if (!dev || dev->no_msi || dev->current_state != PCI_D0) - return -EINVAL; + return 0; /* * You can't ask to have 0 or less MSIs configured. @@ -822,7 +821,7 @@ static int pci_msi_check_device(struct pci_dev *dev, int nvec) * b) the list manipulation code assumes nvec >= 1. */ if (nvec < 1) - return -ERANGE; + return 0; /* * Any bridge which does NOT route MSI transactions from its @@ -833,9 +832,9 @@ static int pci_msi_check_device(struct pci_dev *dev, int nvec) */ for (bus = dev->bus; bus; bus = bus->parent) if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI) - return -EINVAL; + return 0; - return 0; + return 1; } /** @@ -937,9 +936,8 @@ int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec) int status, nr_entries; int i, j; - status = pci_msi_check_device(dev, nvec); - if (status) - return status; + if (!pci_msi_supported(dev, nvec)) + return -EINVAL; if (!entries) return -EINVAL; @@ -1050,9 +1048,8 @@ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec) int nvec; int rc; - rc = pci_msi_check_device(dev, minvec); - if (rc) - return rc; + if (!pci_msi_supported(dev, minvec)) + return -EINVAL; WARN_ON(!!dev->msi_enabled); |