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cfg80211: move offchan_cac_event to a dedicated work
In order to make cfg80211_offchan_cac_abort() (renamed from cfg80211_offchan_cac_event) callable in other contexts and without so much locking restrictions, make it trigger a new work instead of operating directly. Do some other renames while at it to clarify. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://lore.kernel.org/r/6145c3d0f30400a568023f67981981d24c7c6133.1635325205.git.lorenzo@kernel.org [rewrite commit log] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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1507b15319
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@ -7645,19 +7645,13 @@ void cfg80211_cac_event(struct net_device *netdev,
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enum nl80211_radar_event event, gfp_t gfp);
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/**
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* cfg80211_offchan_cac_event - Channel Availability Check (CAC) offchan event
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* cfg80211_offchan_cac_abort - Channel Availability Check offchan abort event
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* @wiphy: the wiphy
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* @chandef: chandef for the current channel
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* @event: type of event
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*
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* This function is called when a Channel Availability Check (CAC) is finished,
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* started or aborted by a offchannel dedicated chain.
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*
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* Note that this acquires the wiphy lock.
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* This function is called by the driver when a Channel Availability Check
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* (CAC) is aborted by a offchannel dedicated chain.
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*/
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void cfg80211_offchan_cac_event(struct wiphy *wiphy,
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const struct cfg80211_chan_def *chandef,
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enum nl80211_radar_event event);
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void cfg80211_offchan_cac_abort(struct wiphy *wiphy);
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/**
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* cfg80211_gtk_rekey_notify - notify userspace about driver rekeying
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@ -545,7 +545,9 @@ struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
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INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
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INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
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INIT_WORK(&rdev->event_work, cfg80211_event_work);
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INIT_DELAYED_WORK(&rdev->offchan_cac_work, cfg80211_offchan_cac_work);
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INIT_WORK(&rdev->offchan_cac_abort_wk, cfg80211_offchan_cac_abort_wk);
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INIT_DELAYED_WORK(&rdev->offchan_cac_done_wk,
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cfg80211_offchan_cac_done_wk);
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init_waitqueue_head(&rdev->dev_wait);
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@ -1055,11 +1057,13 @@ void wiphy_unregister(struct wiphy *wiphy)
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cancel_work_sync(&rdev->conn_work);
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flush_work(&rdev->event_work);
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cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
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cancel_delayed_work_sync(&rdev->offchan_cac_done_wk);
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flush_work(&rdev->destroy_work);
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flush_work(&rdev->sched_scan_stop_wk);
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flush_work(&rdev->propagate_radar_detect_wk);
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flush_work(&rdev->propagate_cac_done_wk);
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flush_work(&rdev->mgmt_registrations_update_wk);
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flush_work(&rdev->offchan_cac_abort_wk);
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#ifdef CONFIG_PM
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if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
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@ -86,7 +86,8 @@ struct cfg80211_registered_device {
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struct wireless_dev *offchan_radar_wdev;
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struct cfg80211_chan_def offchan_radar_chandef;
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struct delayed_work offchan_cac_work;
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struct delayed_work offchan_cac_done_wk;
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struct work_struct offchan_cac_abort_wk;
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/* netlink port which started critical protocol (0 means not started) */
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u32 crit_proto_nlportid;
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@ -502,7 +503,9 @@ cfg80211_start_offchan_radar_detection(struct cfg80211_registered_device *rdev,
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void cfg80211_stop_offchan_radar_detection(struct wireless_dev *wdev);
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void cfg80211_offchan_cac_work(struct work_struct *work);
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void cfg80211_offchan_cac_done_wk(struct work_struct *work);
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void cfg80211_offchan_cac_abort_wk(struct work_struct *work);
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bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
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struct ieee80211_channel *chan);
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@ -971,17 +971,6 @@ void cfg80211_cac_event(struct net_device *netdev,
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}
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EXPORT_SYMBOL(cfg80211_cac_event);
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void cfg80211_offchan_cac_work(struct work_struct *work)
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{
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struct delayed_work *delayed_work = to_delayed_work(work);
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struct cfg80211_registered_device *rdev;
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rdev = container_of(delayed_work, struct cfg80211_registered_device,
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offchan_cac_work);
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cfg80211_offchan_cac_event(&rdev->wiphy, &rdev->offchan_radar_chandef,
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NL80211_RADAR_CAC_FINISHED);
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}
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static void
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__cfg80211_offchan_cac_event(struct cfg80211_registered_device *rdev,
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struct wireless_dev *wdev,
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@ -1006,7 +995,7 @@ __cfg80211_offchan_cac_event(struct cfg80211_registered_device *rdev,
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rdev->offchan_radar_wdev = NULL;
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break;
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case NL80211_RADAR_CAC_ABORTED:
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cancel_delayed_work(&rdev->offchan_cac_work);
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cancel_delayed_work(&rdev->offchan_cac_done_wk);
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wdev = rdev->offchan_radar_wdev;
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rdev->offchan_radar_wdev = NULL;
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break;
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@ -1022,17 +1011,44 @@ __cfg80211_offchan_cac_event(struct cfg80211_registered_device *rdev,
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nl80211_radar_notify(rdev, chandef, event, netdev, GFP_KERNEL);
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}
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void cfg80211_offchan_cac_event(struct wiphy *wiphy,
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const struct cfg80211_chan_def *chandef,
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enum nl80211_radar_event event)
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static void
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cfg80211_offchan_cac_event(struct cfg80211_registered_device *rdev,
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const struct cfg80211_chan_def *chandef,
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enum nl80211_radar_event event)
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{
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wiphy_lock(&rdev->wiphy);
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__cfg80211_offchan_cac_event(rdev, NULL, chandef, event);
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wiphy_unlock(&rdev->wiphy);
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}
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void cfg80211_offchan_cac_done_wk(struct work_struct *work)
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{
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struct delayed_work *delayed_work = to_delayed_work(work);
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struct cfg80211_registered_device *rdev;
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rdev = container_of(delayed_work, struct cfg80211_registered_device,
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offchan_cac_done_wk);
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cfg80211_offchan_cac_event(rdev, &rdev->offchan_radar_chandef,
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NL80211_RADAR_CAC_FINISHED);
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}
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void cfg80211_offchan_cac_abort_wk(struct work_struct *work)
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{
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struct cfg80211_registered_device *rdev;
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rdev = container_of(work, struct cfg80211_registered_device,
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offchan_cac_abort_wk);
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cfg80211_offchan_cac_event(rdev, &rdev->offchan_radar_chandef,
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NL80211_RADAR_CAC_ABORTED);
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}
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void cfg80211_offchan_cac_abort(struct wiphy *wiphy)
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{
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struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
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wiphy_lock(wiphy);
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__cfg80211_offchan_cac_event(rdev, NULL, chandef, event);
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wiphy_unlock(wiphy);
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queue_work(cfg80211_wq, &rdev->offchan_cac_abort_wk);
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}
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EXPORT_SYMBOL(cfg80211_offchan_cac_event);
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EXPORT_SYMBOL(cfg80211_offchan_cac_abort);
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int
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cfg80211_start_offchan_radar_detection(struct cfg80211_registered_device *rdev,
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@ -1062,7 +1078,7 @@ cfg80211_start_offchan_radar_detection(struct cfg80211_registered_device *rdev,
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rdev->offchan_radar_chandef = *chandef;
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__cfg80211_offchan_cac_event(rdev, wdev, chandef,
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NL80211_RADAR_CAC_STARTED);
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queue_delayed_work(cfg80211_wq, &rdev->offchan_cac_work,
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queue_delayed_work(cfg80211_wq, &rdev->offchan_cac_done_wk,
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msecs_to_jiffies(cac_time_ms));
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return 0;
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