batman-adv: consolidate duplicated primary_if checking code

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index b4aa470bc4a6..a4a337d9af9c 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -188,6 +188,42 @@ int batadv_is_my_mac(const uint8_t *addr)
         return 0;
 }
 
+/**
+ * batadv_seq_print_text_primary_if_get - called from debugfs table printing
+ *  function that requires the primary interface
+ * @seq: debugfs table seq_file struct
+ *
+ * Returns primary interface if found or NULL otherwise.
+ */
+struct batadv_hard_iface *
+batadv_seq_print_text_primary_if_get(struct seq_file *seq)
+{
+        struct net_device *net_dev = (struct net_device *)seq->private;
+        struct batadv_priv *bat_priv = netdev_priv(net_dev);
+        struct batadv_hard_iface *primary_if;
+
+        primary_if = batadv_primary_if_get_selected(bat_priv);
+
+        if (!primary_if) {
+                seq_printf(seq,
+                           "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
+                           net_dev->name);
+                goto out;
+        }
+
+        if (primary_if->if_status == BATADV_IF_ACTIVE)
+                goto out;
+
+        seq_printf(seq,
+                   "BATMAN mesh %s disabled - primary interface not active\n",
+                   net_dev->name);
+        batadv_hardif_free_ref(primary_if);
+        primary_if = NULL;
+
+out:
+        return primary_if;
+}
+
 static int batadv_recv_unhandled_packet(struct sk_buff *skb,
                                         struct batadv_hard_iface *recv_if)
 {