Every sriov capable driver has to check if any guest is using a virtual
function prior to disabling, so let's make it common code.
Signed-off-by: Keith Busch <keith.busch@xxxxxxxxx>
---
drivers/pci/pci-sysfs.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 342b691..5011fa9 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -487,6 +487,11 @@ static ssize_t sriov_numvfs_store(struct device *dev,
if (num_vfs == 0) {
/* disable VFs */
+ if (pci_vfs_assigned(pdev)) {
+ dev_warn(&pdev->dev,
+ "Cannot disable SR-IOV VFs while assigned\n");
+ return -EPERM;
+ }
ret = pdev->driver->sriov_configure(pdev, 0);
if (ret < 0)
return ret;
--
2.7.2
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