nl802154: avoid address change while running lowpan

The generation of autoconfigured IPv6 link-local addresses starts with a
notification on interface up.

To handle autoconfiguration according to RFC 4944 requires pan id and
short address to generate an autoconfigured link-local address. This
patch will avoid changing of these link-layer address configuration
while lowpan interface is up.

Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Alexander Aring <aar@pengutronix.de>
Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index 16ef0d9f566e8436e55f0263c51585ae5ab751b9..5f1dc4bfeed5676494cfbd3af0d7dbf3a7da55a8 100644 (file)
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -1074,6 +1074,11 @@ static int nl802154_set_pan_id(struct sk_buff *skb, struct genl_info *info)
        if (netif_running(dev))
                return -EBUSY;
 
+       if (wpan_dev->lowpan_dev) {
+               if (netif_running(wpan_dev->lowpan_dev))
+                       return -EBUSY;
+       }
+
        /* don't change address fields on monitor */
        if (wpan_dev->iftype == NL802154_IFTYPE_MONITOR ||
            !info->attrs[NL802154_ATTR_PAN_ID])
@@ -1105,6 +1110,11 @@ static int nl802154_set_short_addr(struct sk_buff *skb, struct genl_info *info)
        if (netif_running(dev))
                return -EBUSY;
 
+       if (wpan_dev->lowpan_dev) {
+               if (netif_running(wpan_dev->lowpan_dev))
+                       return -EBUSY;
+       }
+
        /* don't change address fields on monitor */
        if (wpan_dev->iftype == NL802154_IFTYPE_MONITOR ||
            !info->attrs[NL802154_ATTR_SHORT_ADDR])