From 652d1100453a14bcc2b4514af79c701360836085 Mon Sep 17 00:00:00 2001 From: Stefan Assmann Date: Wed, 31 Jul 2013 16:47:56 -0600 Subject: [PATCH] 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 Signed-off-by: Bjorn Helgaas --- drivers/pci/iov.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index e73bdae447cc..21a7182dccd4 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -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; -- 2.39.2