From af88b9078d4aa31d667d2d82601ede9cae3bac37 Mon Sep 17 00:00:00 2001 From: Helmut Schaa Date: Mon, 9 Mar 2009 15:47:08 +0100 Subject: mac80211: handle failed scan requests in STA mode If cfg80211 requests a scan it awaits either a return code != 0 from the scan function or the cfg80211_scan_done to be called. In case of a STA mac80211's scan function ever returns 0 and queues the scan request. If ieee80211_sta_work is executed and ieee80211_start_scan fails for some reason cfg80211_scan_done will never be called but cfg80211 still thinks the scan was triggered successfully and will refuse any future scan requests due to drv->scan_req not being cleaned up. If a scan is triggered from within the MLME a similar problem appears. If ieee80211_start_scan returns an error, local->scan_req will not be reset and mac80211 will refuse any future scan requests. Hence, in both cases call ieee80211_scan_failed (which notifies cfg80211 and resets local->scan_req) if ieee80211_start_scan returns an error. Signed-off-by: Helmut Schaa Signed-off-by: John W. Linville --- net/mac80211/scan.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'net/mac80211/scan.c') diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c index 0e81e1633a66..5030a3c87509 100644 --- a/net/mac80211/scan.c +++ b/net/mac80211/scan.c @@ -202,6 +202,18 @@ ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, return RX_QUEUED; } +void ieee80211_scan_failed(struct ieee80211_local *local) +{ + if (WARN_ON(!local->scan_req)) + return; + + /* notify cfg80211 about the failed scan */ + if (local->scan_req != &local->int_scan_req) + cfg80211_scan_done(local->scan_req, true); + + local->scan_req = NULL; +} + void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) { struct ieee80211_local *local = hw_to_local(hw); -- cgit v1.2.3