[PATCH v2 ipsec-next 2/3] xfrm: check for xdo_dev_ops add and delete

[Shannon Nelson <shannon.nelson@oracle.com>]

This adds a check for the required add and delete functions up front
at registration time to be sure both are defined.

Signed-off-by: Shannon Nelson <shannon.nelson@oracle.com>
---
 net/xfrm/xfrm_device.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index 30e5746..5eb6b82 100644
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -144,11 +144,19 @@ EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok);
 
 static int xfrm_dev_register(struct net_device *dev)
 {
-	if ((dev->features & NETIF_F_HW_ESP) && !dev->xfrmdev_ops)
-		return NOTIFY_BAD;
-	if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) &&
-	    !(dev->features & NETIF_F_HW_ESP))
+	if (!(dev->features & NETIF_F_HW_ESP)) {
+		if (dev->features & NETIF_F_HW_ESP_TX_CSUM)
+			return NOTIFY_BAD;
+		else
+			return NOTIFY_DONE;
+	}
+
+#ifdef CONFIG_XFRM_OFFLOAD
+	if (!(dev->xfrmdev_ops &&
+	      dev->xfrmdev_ops->xdo_dev_state_add &&
+	      dev->xfrmdev_ops->xdo_dev_state_delete))
 		return NOTIFY_BAD;
+#endif
 
 	return NOTIFY_DONE;
 }
-- 
2.7.4