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PCI: Return -ENOSYS for SR-IOV operations on non-SR-IOV devices 

Change the return value to -ENOSYS if a device is not an SR-IOV PF.
Previously we returned either -ENODEV or -EINVAL.

Also have pci_sriov_get_totalvfs() return 0 in the error case to make the
behaviour consistent whether CONFIG_PCI_IOV is enabled or not.

Signed-off-by: Stefan Assmann <sassmann@kpanic.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Stefan Assmann 2013-07-31 16:47:56 -06:00 committed by Bjorn Helgaas
parent 19b6984e97
commit 652d110045
1 changed files with 10 additions and 7 deletions
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17
drivers/pci/iov.c
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@ -323,7 +323,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
if (!pdev->is_physfn) {
pci_dev_put(pdev);
return -ENODEV;
return -ENOSYS;
}
rc = sysfs_create_link(&dev->dev.kobj,
@ -664,7 +664,7 @@ int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
might_sleep();
if (!dev->is_physfn)
return -ENODEV;
return -ENOSYS;
return sriov_enable(dev, nr_virtfn);
}
@ -724,7 +724,7 @@ EXPORT_SYMBOL_GPL(pci_num_vf);
* @dev: the PCI device
*
* Returns number of VFs belonging to this device that are assigned to a guest.
* If device is not a physical function returns -ENODEV.
* If device is not a physical function returns 0.
*/
int pci_vfs_assigned(struct pci_dev *dev)
{
@ -769,12 +769,15 @@ EXPORT_SYMBOL_GPL(pci_vfs_assigned);
* device's mutex held.
*
* Returns 0 if PF is an SRIOV-capable device and
* value of numvfs valid. If not a PF with VFS, return -EINVAL;
* value of numvfs valid. If not a PF return -ENOSYS;
* if numvfs is invalid return -EINVAL;
* if VFs already enabled, return -EBUSY.
*/
int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
{
if (!dev->is_physfn || (numvfs > dev->sriov->total_VFs))
if (!dev->is_physfn)
return -ENOSYS;
if (numvfs > dev->sriov->total_VFs)
return -EINVAL;
/* Shouldn't change if VFs already enabled */
@ -793,12 +796,12 @@ EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs);
*
* For a PCIe device with SRIOV support, return the PCIe
* SRIOV capability value of TotalVFs or the value of driver_max_VFs
* if the driver reduced it. Otherwise, -EINVAL.
* if the driver reduced it. Otherwise 0.
*/
int pci_sriov_get_totalvfs(struct pci_dev *dev)
{
if (!dev->is_physfn)
return -EINVAL;
return 0;
if (dev->sriov->driver_max_VFs)
return dev->sriov->driver_max_VFs;