1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 5a20804fdece..4ef7e2fd9fe6 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -319,6 +319,13 @@ static ssize_t bonding_store_mode(struct device *d,
                 goto out;
         }
 
+        if (bond->slave_cnt > 0) {
+                pr_err("unable to update mode of %s because it has slaves.\n",
+                        bond->dev->name);
+                ret = -EPERM;
+                goto out;
+        }
+
         new_value = bond_parse_parm(buf, bond_mode_tbl);
         if (new_value < 0)  {
                 pr_err("%s: Ignoring invalid mode value %.*s.\n",