From b7a530d82cb36bb43901c196039b0fccee3ffcc3 Mon Sep 17 00:00:00 2001 From: Jouni Malinen Date: Wed, 10 Dec 2008 14:51:47 +0200 Subject: mac80211: Disable requests for new scans in AP mode AP mode operations are seriously affected if mac80211 runs through a multi-second scan while the AP is trying to send Beacon frames on the operation channel. While this could be implemented in a way that does not cause too many problems, it is not very simple and will require synchronization with Beacon frame scheduling in the drivers (scan one channel at a time between Beacon frames). Furthermore, such scanning takes quite a bit longer time and existing userspace applications would be likely to timeout while waiting for the results. For now, just refuse requests for new scans (SIOCSIWSCAN) when in AP mode. In practice, this moves the rejection from iwl* drivers into mac80211 to make it apply to every mac80211-based driver. This issue shows up in associated stations getting disconnected when something (e.g., Network Manager) requests a scan while the interface is in AP mode. When doing this continuously (e.g., NM does it every 120 seconds), the network gets close to useless. Signed-off-by: Jouni Malinen Acked-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/wext.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'net') diff --git a/net/mac80211/wext.c b/net/mac80211/wext.c index fbeb927c116..15428048d01 100644 --- a/net/mac80211/wext.c +++ b/net/mac80211/wext.c @@ -418,8 +418,7 @@ static int ieee80211_ioctl_siwscan(struct net_device *dev, if (sdata->vif.type != NL80211_IFTYPE_STATION && sdata->vif.type != NL80211_IFTYPE_ADHOC && - sdata->vif.type != NL80211_IFTYPE_MESH_POINT && - sdata->vif.type != NL80211_IFTYPE_AP) + sdata->vif.type != NL80211_IFTYPE_MESH_POINT) return -EOPNOTSUPP; /* if SSID was specified explicitly then use that */ -- cgit v1.2.3