From: Johannes Berg Date: Fri, 18 Jun 2010 10:32:20 +0000 (+0200) Subject: mac80211: fix sw scan bracketing X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=543708be;p=linux-beck.git mac80211: fix sw scan bracketing Currently, detection in hwsim and ath9k can detect that two sw scans are in flight at the same time, which isn't really true. It is caused by a race condition, because the scan complete callback is called too late, after the lock has been dropped, so that a new scan can be started before it is called. It is also called too early semantically, as it is currently called _after_ the return to the operating channel -- it should be before so that drivers know this is the operating channel again. Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c index e1b0be7a57b9..36eb6dd7c75e 100644 --- a/net/mac80211/scan.c +++ b/net/mac80211/scan.c @@ -286,6 +286,8 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) local->scanning = 0; local->scan_channel = NULL; + drv_sw_scan_complete(local); + /* we only have to protect scan_req and hw/sw scan */ mutex_unlock(&local->scan_mtx); @@ -295,8 +297,6 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) ieee80211_configure_filter(local); - drv_sw_scan_complete(local); - ieee80211_offchannel_return(local, true); done: