On Wed, 2014-11-12 at 14:08 +0200, Jukka Rissanen wrote:
> @@ -850,8 +852,10 @@ void __cfg80211_leave(struct cfg80211_registered_device
> *rdev,
> break;
> case NL80211_IFTYPE_P2P_CLIENT:
> case NL80211_IFTYPE_STATION:
> - if (rdev->sched_scan_req && dev == rdev->sched_scan_req->dev)
> + if (sched_scan_req && dev == sched_scan_req->dev) {
> + cancel_work_sync(&sched_scan_req->sched_scan_stop_wk);
> __cfg80211_stop_sched_scan(rdev, false);
> + }
>
> #ifdef CONFIG_CFG80211_WEXT
> kfree(wdev->wext.ie);
> @@ -991,6 +995,10 @@ static int cfg80211_netdev_notifier_call(struct
> notifier_block *nb,
>
> if (WARN_ON(rdev->sched_scan_req &&
> rdev->sched_scan_req->dev == wdev->netdev)) {
> + struct cfg80211_sched_scan_request *sched_scan_req =
> + rdev->sched_scan_req;
> +
> + cancel_work_sync(&sched_scan_req->sched_scan_stop_wk);
> __cfg80211_stop_sched_scan(rdev, false);
> }
>
This can cause deadlocks as it's done with the RTNL held, yet the work
acquires the RTNL.
johannes
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