PCI/IOV: Factor out sriov_add_vfs()

Provide sriov_add_vfs() as a wrapper to scan for VFs that cleans up after
itself.  This is just a code simplification.  No functional change.

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

Author: sebott

drivers/pci/iov.c

@@ -252,6 +252,24 @@ int __weak pcibios_sriov_disable(struct pci_dev *pdev)
 	return 0;
 }
 
+static int sriov_add_vfs(struct pci_dev *dev, u16 num_vfs)
+{
+	unsigned int i;
+	int rc;
+
+	for (i = 0; i < num_vfs; i++) {
+		rc = pci_iov_add_virtfn(dev, i);
+		if (rc)
+			goto failed;
+	}
+	return 0;
+failed:
+	while (i--)
+		pci_iov_remove_virtfn(dev, i);
+
+	return rc;
+}
+
 static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
 {
 	int rc;
@@ -337,21 +355,15 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
 	msleep(100);
 	pci_cfg_access_unlock(dev);
 
-	for (i = 0; i < initial; i++) {
-		rc = pci_iov_add_virtfn(dev, i);
-		if (rc)
-			goto failed;
-	}
+	rc = sriov_add_vfs(dev, initial);
+	if (rc)
+		goto err_pcibios;
 
 	kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
 	iov->num_VFs = nr_virtfn;
 
 	return 0;
 
-failed:
-	while (i--)
-		pci_iov_remove_virtfn(dev, i);
-
 err_pcibios:
 	iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
 	pci_cfg_access_lock(dev);
@@ -368,17 +380,23 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
 	return rc;
 }
 
-static void sriov_disable(struct pci_dev *dev)
+static void sriov_del_vfs(struct pci_dev *dev)
 {
+	struct pci_sriov *iov = dev->sriov;
 	int i;
+
+	for (i = 0; i < iov->num_VFs; i++)
+		pci_iov_remove_virtfn(dev, i);
+}
+
+static void sriov_disable(struct pci_dev *dev)
+{
 	struct pci_sriov *iov = dev->sriov;
 
 	if (!iov->num_VFs)
 		return;
 
-	for (i = 0; i < iov->num_VFs; i++)
-		pci_iov_remove_virtfn(dev, i);
-
+	sriov_del_vfs(dev);
 	iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
 	pci_cfg_access_lock(dev);
 	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);