For wireless device objects with an associated netdev, the DEL_INTERFACE
event is generated inside the netdev notifier. The event is generated
regardless of whether it was due to a NL80211_CMD_DEL_INTERFACE call
from userspace or if the netdev was destroyed by other means.
If NL80211_CMD_DEL_INTERFACE handler is called, then a duplicate
DEL_INTERFACE event will be multicast. This change modifies the logic
inside nl80211_del_interface to avoid this.
---
net/wireless/nl80211.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index ec8eb88..a65c271 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2913,7 +2913,17 @@ static int nl80211_del_interface(struct sk_buff *skb, struct genl_info *info)
if (!rdev->ops->del_virtual_intf)
return -EOPNOTSUPP;
- msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ /*
+ * For wdevs which have no associated netdev object (e.g. of type
+ * NL80211_IFTYPE_P2P_DEVICE), emit the DEL_INTERFACE event here.
+ * For all other types, the event will be generated from the
+ * netdev notifier
+ */
+ if (!wdev->netdev)
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ else
+ msg = NULL;
+
if (msg && nl80211_send_iface(msg, 0, 0, 0, rdev, wdev, true) < 0) {
nlmsg_free(msg);
msg = NULL;
--
2.7.3
--
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