Staging: batman-adv: convert more files from /proc to /sys

converted files:
vis_mode, vis_data

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/staging/batman-adv/translation-table.c b/drivers/staging/batman-adv/translation-table.c
index d43b1adccf7..b735200ecf1 100644
--- a/drivers/staging/batman-adv/translation-table.c
+++ b/drivers/staging/batman-adv/translation-table.c
@@ -165,6 +165,19 @@ int hna_local_fill_buffer_text(struct net_device *net_dev, char *buff,
         unsigned long flags;
         size_t hdr_len;
 
+        rcu_read_lock();
+        if (list_empty(&if_list)) {
+                rcu_read_unlock();
+
+                if (off == 0)
+                        return sprintf(buff,
+                                       "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
+                                       net_dev->name);
+
+                return 0;
+        }
+        rcu_read_unlock();
+
         hdr_len = sprintf(buff,
                           "Locally retrieved addresses (from %s) announced via HNA:\n",
                           net_dev->name);
@@ -369,6 +382,19 @@ int hna_global_fill_buffer_text(struct net_device *net_dev, char *buff,
         unsigned long flags;
         size_t hdr_len;
 
+        rcu_read_lock();
+        if (list_empty(&if_list)) {
+                rcu_read_unlock();
+
+                if (off == 0)
+                        return sprintf(buff,
+                                       "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
+                                       net_dev->name);
+
+                return 0;
+        }
+        rcu_read_unlock();
+
         hdr_len = sprintf(buff,
                           "Globally announced HNAs received via the mesh %s (translation table):\n",
                           net_dev->name);