From 68dd5b7a45d1935fcd32b786e8d3d3f7bb4bbfe7 Mon Sep 17 00:00:00 2001 From: Teemu Paasikivi Date: Fri, 9 Apr 2010 13:07:55 +0300 Subject: [PATCH] mac80211: check whether scan is in progress before queueing scan_work As scan_work is queued from work_work it needs to be checked if scan has been started during execution of work_work. Otherwise, when hw scan is used, the stack gets error about hw being busy with ongoing scan. This causes the stack to abort scan without notifying the driver about it. This leads to a situation where the hw is scanning and the stack thinks it's not. Then when the scan finishes, the stack will complain by warnings. Signed-off-by: Teemu Paasikivi Reviewed-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/work.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/mac80211/work.c b/net/mac80211/work.c index 1e1ea3007b06..7bd8670379de 100644 --- a/net/mac80211/work.c +++ b/net/mac80211/work.c @@ -919,11 +919,16 @@ static void ieee80211_work_work(struct work_struct *work) run_again(local, jiffies + HZ/2); } - if (list_empty(&local->work_list) && local->scan_req) + mutex_lock(&local->scan_mtx); + + if (list_empty(&local->work_list) && local->scan_req && + !local->scanning) ieee80211_queue_delayed_work(&local->hw, &local->scan_work, round_jiffies_relative(0)); + mutex_unlock(&local->scan_mtx); + mutex_unlock(&local->work_mtx); ieee80211_recalc_idle(local); -- GitLab