From: Johannes Berg Date: Tue, 21 Oct 2014 18:56:42 +0000 (+0200) Subject: mac80211: properly flush delayed scan work on interface removal X-Git-Tag: v3.18-rc5~22^2~23^2^2~1 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=46238845bd609a5c0fbe076e1b82b4c5b33360b2;p=~emulex%2Finfiniband.git mac80211: properly flush delayed scan work on interface removal When an interface is deleted, an ongoing hardware scan is canceled and the driver must abort the scan, at the very least reporting completion while the interface is removed. However, if it scheduled the work that might only run after everything is said and done, which leads to cfg80211 warning that the scan isn't reported as finished yet; this is no fault of the driver, it already did, but mac80211 hasn't processed it. To fix this situation, flush the delayed work when the interface being removed is the one that was executing the scan. Cc: stable@vger.kernel.org Reported-by: Sujith Manoharan Tested-by: Sujith Manoharan Signed-off-by: Johannes Berg --- diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 3b9e2b7b3f3..653f5eb07a2 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -766,10 +766,12 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, int i, flushed; struct ps_data *ps; struct cfg80211_chan_def chandef; + bool cancel_scan; clear_bit(SDATA_STATE_RUNNING, &sdata->state); - if (rcu_access_pointer(local->scan_sdata) == sdata) + cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; + if (cancel_scan) ieee80211_scan_cancel(local); /* @@ -992,6 +994,9 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, ieee80211_recalc_ps(local, -1); + if (cancel_scan) + flush_delayed_work(&local->scan_work); + if (local->open_count == 0) { ieee80211_stop_device(local);