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[PATCH] mac80211: allow interface settings changes only when down

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We currently allow monitor flags changes and mesh ID changes when
the interface is up, which can lead to trouble. Change it to only
allow when down.

Signed-off-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
---
 net/mac80211/cfg.c |    3 +++
 1 file changed, 3 insertions(+)

--- everything.orig/net/mac80211/cfg.c	2008-09-16 20:19:48.000000000 +0200
+++ everything/net/mac80211/cfg.c	2008-09-16 20:20:37.000000000 +0200
@@ -102,6 +102,9 @@ static int ieee80211_change_iface(struct
 	if (ret)
 		return ret;
 
+	if (netif_running(sdata->dev))
+		return -EBUSY;
+
 	if (ieee80211_vif_is_mesh(&sdata->vif) && params->mesh_id_len)
 		ieee80211_sdata_set_mesh_id(sdata,
 					    params->mesh_id_len,


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