[VLAN]: Split up device checks

Move the checks of the underlying device to a seperate function.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 32 insertions, 24 deletions

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 1b9dc5ecd448..1e33dbb85d14 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -410,57 +410,65 @@ static void vlan_transfer_operstate(const struct net_device *dev, struct net_dev
         }
 }
 
-/*  Attach a VLAN device to a mac address (ie Ethernet Card).
- *  Returns the device that was created, or NULL if there was
- *  an error of some kind.
- */
-static struct net_device *register_vlan_device(struct net_device *real_dev,
-                                               unsigned short VLAN_ID)
+static int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 {
-        struct vlan_group *grp, *ngrp = NULL;
-        struct net_device *new_dev;
-        char name[IFNAMSIZ];
-
-#ifdef VLAN_DEBUG
-        printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
-                __FUNCTION__, eth_IF_name, VLAN_ID);
-#endif
-
-        if (VLAN_ID >= VLAN_VID_MASK)
-                goto out_ret_null;
-
         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
                         __FUNCTION__, real_dev->name);
-                goto out_ret_null;
+                return -EOPNOTSUPP;
         }
 
         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
             !real_dev->vlan_rx_register) {
                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
                         __FUNCTION__, real_dev->name);
-                goto out_ret_null;
+                return -EOPNOTSUPP;
         }
 
         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
                         __FUNCTION__, real_dev->name);
-                goto out_ret_null;
+                return -EOPNOTSUPP;
         }
 
         /* The real device must be up and operating in order to
          * assosciate a VLAN device with it.
          */
         if (!(real_dev->flags & IFF_UP))
-                goto out_ret_null;
+                return -ENETDOWN;
 
-        if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
+        if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
                 /* was already registered. */
                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
-                goto out_ret_null;
+                return -EEXIST;
         }
 
+        return 0;
+}
+
+/*  Attach a VLAN device to a mac address (ie Ethernet Card).
+ *  Returns the device that was created, or NULL if there was
+ *  an error of some kind.
+ */
+static struct net_device *register_vlan_device(struct net_device *real_dev,
+                                               unsigned short VLAN_ID)
+{
+        struct vlan_group *grp, *ngrp = NULL;
+        struct net_device *new_dev;
+        char name[IFNAMSIZ];
+
+#ifdef VLAN_DEBUG
+        printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
+                __FUNCTION__, eth_IF_name, VLAN_ID);
+#endif
+
+        if (VLAN_ID >= VLAN_VID_MASK)
+                goto out_ret_null;
+
+        if (vlan_check_real_dev(real_dev, VLAN_ID) < 0)
+                goto out_ret_null;
+
         /* Gotta set up the fields for the device. */
 #ifdef VLAN_DEBUG
         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",