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>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index db8866d..362da9f 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -7645,19 +7645,13 @@ void cfg80211_cac_event(struct net_device *netdev,
                        enum nl80211_radar_event event, gfp_t gfp);
 
 /**
- * cfg80211_offchan_cac_event - Channel Availability Check (CAC) offchan event
+ * cfg80211_offchan_cac_abort - Channel Availability Check offchan abort event
  * @wiphy: the wiphy
- * @chandef: chandef for the current channel
- * @event: type of event
- *
- * This function is called when a Channel Availability Check (CAC) is finished,
- * started or aborted by a offchannel dedicated chain.
  *
- * Note that this acquires the wiphy lock.
+ * This function is called by the driver when a Channel Availability Check
+ * (CAC) is aborted by a offchannel dedicated chain.
  */
-void cfg80211_offchan_cac_event(struct wiphy *wiphy,
-                               const struct cfg80211_chan_def *chandef,
-                               enum nl80211_radar_event event);
+void cfg80211_offchan_cac_abort(struct wiphy *wiphy);
 
 /**
  * cfg80211_gtk_rekey_notify - notify userspace about driver rekeying

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 39b2d4a..c4ea903 100644 (file)
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -545,7 +545,9 @@ use_default_name:
        INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
        INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
        INIT_WORK(&rdev->event_work, cfg80211_event_work);
-       INIT_DELAYED_WORK(&rdev->offchan_cac_work, cfg80211_offchan_cac_work);
+       INIT_WORK(&rdev->offchan_cac_abort_wk, cfg80211_offchan_cac_abort_wk);
+       INIT_DELAYED_WORK(&rdev->offchan_cac_done_wk,
+                         cfg80211_offchan_cac_done_wk);
 
        init_waitqueue_head(&rdev->dev_wait);
 
@@ -1055,11 +1057,13 @@ void wiphy_unregister(struct wiphy *wiphy)
        cancel_work_sync(&rdev->conn_work);
        flush_work(&rdev->event_work);
        cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
+       cancel_delayed_work_sync(&rdev->offchan_cac_done_wk);
        flush_work(&rdev->destroy_work);
        flush_work(&rdev->sched_scan_stop_wk);
        flush_work(&rdev->propagate_radar_detect_wk);
        flush_work(&rdev->propagate_cac_done_wk);
        flush_work(&rdev->mgmt_registrations_update_wk);
+       flush_work(&rdev->offchan_cac_abort_wk);
 
 #ifdef CONFIG_PM
        if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)

diff --git a/net/wireless/core.h b/net/wireless/core.h
index 612d460..fb8d900 100644 (file)
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -86,7 +86,8 @@ struct cfg80211_registered_device {
 
        struct wireless_dev *offchan_radar_wdev;
        struct cfg80211_chan_def offchan_radar_chandef;
-       struct delayed_work offchan_cac_work;
+       struct delayed_work offchan_cac_done_wk;
+       struct work_struct offchan_cac_abort_wk;
 
        /* netlink port which started critical protocol (0 means not started) */
        u32 crit_proto_nlportid;
@@ -502,7 +503,9 @@ cfg80211_start_offchan_radar_detection(struct cfg80211_registered_device *rdev,
 
 void cfg80211_stop_offchan_radar_detection(struct wireless_dev *wdev);
 
-void cfg80211_offchan_cac_work(struct work_struct *work);
+void cfg80211_offchan_cac_done_wk(struct work_struct *work);
+
+void cfg80211_offchan_cac_abort_wk(struct work_struct *work);
 
 bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
                                  struct ieee80211_channel *chan);

diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 46f2ec4..8407958 100644 (file)
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -971,17 +971,6 @@ void cfg80211_cac_event(struct net_device *netdev,
 }
 EXPORT_SYMBOL(cfg80211_cac_event);
 
-void cfg80211_offchan_cac_work(struct work_struct *work)
-{
-       struct delayed_work *delayed_work = to_delayed_work(work);
-       struct cfg80211_registered_device *rdev;
-
-       rdev = container_of(delayed_work, struct cfg80211_registered_device,
-                           offchan_cac_work);
-       cfg80211_offchan_cac_event(&rdev->wiphy, &rdev->offchan_radar_chandef,
-                                  NL80211_RADAR_CAC_FINISHED);
-}
-
 static void
 __cfg80211_offchan_cac_event(struct cfg80211_registered_device *rdev,
                             struct wireless_dev *wdev,
@@ -1006,7 +995,7 @@ __cfg80211_offchan_cac_event(struct cfg80211_registered_device *rdev,
                rdev->offchan_radar_wdev = NULL;
                break;
        case NL80211_RADAR_CAC_ABORTED:
-               cancel_delayed_work(&rdev->offchan_cac_work);
+               cancel_delayed_work(&rdev->offchan_cac_done_wk);
                wdev = rdev->offchan_radar_wdev;
                rdev->offchan_radar_wdev = NULL;
                break;
@@ -1022,17 +1011,44 @@ __cfg80211_offchan_cac_event(struct cfg80211_registered_device *rdev,
        nl80211_radar_notify(rdev, chandef, event, netdev, GFP_KERNEL);
 }
 
-void cfg80211_offchan_cac_event(struct wiphy *wiphy,
-                               const struct cfg80211_chan_def *chandef,
-                               enum nl80211_radar_event event)
+static void
+cfg80211_offchan_cac_event(struct cfg80211_registered_device *rdev,
+                          const struct cfg80211_chan_def *chandef,
+                          enum nl80211_radar_event event)
+{
+       wiphy_lock(&rdev->wiphy);
+       __cfg80211_offchan_cac_event(rdev, NULL, chandef, event);
+       wiphy_unlock(&rdev->wiphy);
+}
+
+void cfg80211_offchan_cac_done_wk(struct work_struct *work)
+{
+       struct delayed_work *delayed_work = to_delayed_work(work);
+       struct cfg80211_registered_device *rdev;
+
+       rdev = container_of(delayed_work, struct cfg80211_registered_device,
+                           offchan_cac_done_wk);
+       cfg80211_offchan_cac_event(rdev, &rdev->offchan_radar_chandef,
+                                  NL80211_RADAR_CAC_FINISHED);
+}
+
+void cfg80211_offchan_cac_abort_wk(struct work_struct *work)
+{
+       struct cfg80211_registered_device *rdev;
+
+       rdev = container_of(work, struct cfg80211_registered_device,
+                           offchan_cac_abort_wk);
+       cfg80211_offchan_cac_event(rdev, &rdev->offchan_radar_chandef,
+                                  NL80211_RADAR_CAC_ABORTED);
+}
+
+void cfg80211_offchan_cac_abort(struct wiphy *wiphy)
 {
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 
-       wiphy_lock(wiphy);
-       __cfg80211_offchan_cac_event(rdev, NULL, chandef, event);
-       wiphy_unlock(wiphy);
+       queue_work(cfg80211_wq, &rdev->offchan_cac_abort_wk);
 }
-EXPORT_SYMBOL(cfg80211_offchan_cac_event);
+EXPORT_SYMBOL(cfg80211_offchan_cac_abort);
 
 int
 cfg80211_start_offchan_radar_detection(struct cfg80211_registered_device *rdev,
@@ -1062,7 +1078,7 @@ cfg80211_start_offchan_radar_detection(struct cfg80211_registered_device *rdev,
        rdev->offchan_radar_chandef = *chandef;
        __cfg80211_offchan_cac_event(rdev, wdev, chandef,
                                     NL80211_RADAR_CAC_STARTED);
-       queue_delayed_work(cfg80211_wq, &rdev->offchan_cac_work,
+       queue_delayed_work(cfg80211_wq, &rdev->offchan_cac_done_wk,
                           msecs_to_jiffies(cac_time_ms));
 
        return 0;