package/kernel/mac80211/patches/subsys/315-cfg80211-move-offchan_cac_event-to-a-dedicated-work.patch

   1 From: Lorenzo Bianconi <lorenzo@kernel.org>
   2 Date: Wed, 27 Oct 2021 11:03:42 +0200
   3 Subject: [PATCH] cfg80211: move offchan_cac_event to a dedicated work
   4
   5 In order to make cfg80211_offchan_cac_abort() (renamed from
   6 cfg80211_offchan_cac_event) callable in other contexts and
   7 without so much locking restrictions, make it trigger a new
   8 work instead of operating directly.
   9
  10 Do some other renames while at it to clarify.
  11
  12 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  13 Link: https://lore.kernel.org/r/6145c3d0f30400a568023f67981981d24c7c6133.1635325205.git.lorenzo@kernel.org
  14 [rewrite commit log]
  15 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  16 ---
  17
  18 --- a/include/net/cfg80211.h
  19 +++ b/include/net/cfg80211.h
  20 @@ -7620,19 +7620,13 @@ void cfg80211_cac_event(struct net_devic
  21                         enum nl80211_radar_event event, gfp_t gfp);
  22
  23  /**
  24 - * cfg80211_offchan_cac_event - Channel Availability Check (CAC) offchan event
  25 + * cfg80211_offchan_cac_abort - Channel Availability Check offchan abort event
  26   * @wiphy: the wiphy
  27 - * @chandef: chandef for the current channel
  28 - * @event: type of event
  29   *
  30 - * This function is called when a Channel Availability Check (CAC) is finished,
  31 - * started or aborted by a offchannel dedicated chain.
  32 - *
  33 - * Note that this acquires the wiphy lock.
  34 + * This function is called by the driver when a Channel Availability Check
  35 + * (CAC) is aborted by a offchannel dedicated chain.
  36   */
  37 -void cfg80211_offchan_cac_event(struct wiphy *wiphy,
  38 -                               const struct cfg80211_chan_def *chandef,
  39 -                               enum nl80211_radar_event event);
  40 +void cfg80211_offchan_cac_abort(struct wiphy *wiphy);
  41
  42  /**
  43   * cfg80211_gtk_rekey_notify - notify userspace about driver rekeying
  44 --- a/net/wireless/core.c
  45 +++ b/net/wireless/core.c
  46 @@ -543,7 +543,9 @@ use_default_name:
  47         INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
  48         INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
  49         INIT_WORK(&rdev->event_work, cfg80211_event_work);
  50 -       INIT_DELAYED_WORK(&rdev->offchan_cac_work, cfg80211_offchan_cac_work);
  51 +       INIT_WORK(&rdev->offchan_cac_abort_wk, cfg80211_offchan_cac_abort_wk);
  52 +       INIT_DELAYED_WORK(&rdev->offchan_cac_done_wk,
  53 +                         cfg80211_offchan_cac_done_wk);
  54
  55         init_waitqueue_head(&rdev->dev_wait);
  56
  57 @@ -1053,11 +1055,13 @@ void wiphy_unregister(struct wiphy *wiph
  58         cancel_work_sync(&rdev->conn_work);
  59         flush_work(&rdev->event_work);
  60         cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
  61 +       cancel_delayed_work_sync(&rdev->offchan_cac_done_wk);
  62         flush_work(&rdev->destroy_work);
  63         flush_work(&rdev->sched_scan_stop_wk);
  64         flush_work(&rdev->propagate_radar_detect_wk);
  65         flush_work(&rdev->propagate_cac_done_wk);
  66         flush_work(&rdev->mgmt_registrations_update_wk);
  67 +       flush_work(&rdev->offchan_cac_abort_wk);
  68
  69  #ifdef CONFIG_PM
  70         if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
  71 --- a/net/wireless/core.h
  72 +++ b/net/wireless/core.h
  73 @@ -86,7 +86,8 @@ struct cfg80211_registered_device {
  74
  75         struct wireless_dev *offchan_radar_wdev;
  76         struct cfg80211_chan_def offchan_radar_chandef;
  77 -       struct delayed_work offchan_cac_work;
  78 +       struct delayed_work offchan_cac_done_wk;
  79 +       struct work_struct offchan_cac_abort_wk;
  80
  81         /* netlink port which started critical protocol (0 means not started) */
  82         u32 crit_proto_nlportid;
  83 @@ -502,7 +503,9 @@ cfg80211_start_offchan_radar_detection(s
  84
  85  void cfg80211_stop_offchan_radar_detection(struct wireless_dev *wdev);
  86
  87 -void cfg80211_offchan_cac_work(struct work_struct *work);
  88 +void cfg80211_offchan_cac_done_wk(struct work_struct *work);
  89 +
  90 +void cfg80211_offchan_cac_abort_wk(struct work_struct *work);
  91
  92  bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
  93                                   struct ieee80211_channel *chan);
  94 --- a/net/wireless/mlme.c
  95 +++ b/net/wireless/mlme.c
  96 @@ -971,17 +971,6 @@ void cfg80211_cac_event(struct net_devic
  97  }
  98  EXPORT_SYMBOL(cfg80211_cac_event);
  99
 100 -void cfg80211_offchan_cac_work(struct work_struct *work)
 101 -{
 102 -       struct delayed_work *delayed_work = to_delayed_work(work);
 103 -       struct cfg80211_registered_device *rdev;
 104 -
 105 -       rdev = container_of(delayed_work, struct cfg80211_registered_device,
 106 -                           offchan_cac_work);
 107 -       cfg80211_offchan_cac_event(&rdev->wiphy, &rdev->offchan_radar_chandef,
 108 -                                  NL80211_RADAR_CAC_FINISHED);
 109 -}
 110 -
 111  static void
 112  __cfg80211_offchan_cac_event(struct cfg80211_registered_device *rdev,
 113                              struct wireless_dev *wdev,
 114 @@ -1006,7 +995,7 @@ __cfg80211_offchan_cac_event(struct cfg8
 115                 rdev->offchan_radar_wdev = NULL;
 116                 break;
 117         case NL80211_RADAR_CAC_ABORTED:
 118 -               cancel_delayed_work(&rdev->offchan_cac_work);
 119 +               cancel_delayed_work(&rdev->offchan_cac_done_wk);
 120                 wdev = rdev->offchan_radar_wdev;
 121                 rdev->offchan_radar_wdev = NULL;
 122                 break;
 123 @@ -1022,17 +1011,44 @@ __cfg80211_offchan_cac_event(struct cfg8
 124         nl80211_radar_notify(rdev, chandef, event, netdev, GFP_KERNEL);
 125  }
 126
 127 -void cfg80211_offchan_cac_event(struct wiphy *wiphy,
 128 -                               const struct cfg80211_chan_def *chandef,
 129 -                               enum nl80211_radar_event event)
 130 +static void
 131 +cfg80211_offchan_cac_event(struct cfg80211_registered_device *rdev,
 132 +                          const struct cfg80211_chan_def *chandef,
 133 +                          enum nl80211_radar_event event)
 134 +{
 135 +       wiphy_lock(&rdev->wiphy);
 136 +       __cfg80211_offchan_cac_event(rdev, NULL, chandef, event);
 137 +       wiphy_unlock(&rdev->wiphy);
 138 +}
 139 +
 140 +void cfg80211_offchan_cac_done_wk(struct work_struct *work)
 141 +{
 142 +       struct delayed_work *delayed_work = to_delayed_work(work);
 143 +       struct cfg80211_registered_device *rdev;
 144 +
 145 +       rdev = container_of(delayed_work, struct cfg80211_registered_device,
 146 +                           offchan_cac_done_wk);
 147 +       cfg80211_offchan_cac_event(rdev, &rdev->offchan_radar_chandef,
 148 +                                  NL80211_RADAR_CAC_FINISHED);
 149 +}
 150 +
 151 +void cfg80211_offchan_cac_abort_wk(struct work_struct *work)
 152 +{
 153 +       struct cfg80211_registered_device *rdev;
 154 +
 155 +       rdev = container_of(work, struct cfg80211_registered_device,
 156 +                           offchan_cac_abort_wk);
 157 +       cfg80211_offchan_cac_event(rdev, &rdev->offchan_radar_chandef,
 158 +                                  NL80211_RADAR_CAC_ABORTED);
 159 +}
 160 +
 161 +void cfg80211_offchan_cac_abort(struct wiphy *wiphy)
 162  {
 163         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 164
 165 -       wiphy_lock(wiphy);
 166 -       __cfg80211_offchan_cac_event(rdev, NULL, chandef, event);
 167 -       wiphy_unlock(wiphy);
 168 +       queue_work(cfg80211_wq, &rdev->offchan_cac_abort_wk);
 169  }
 170 -EXPORT_SYMBOL(cfg80211_offchan_cac_event);
 171 +EXPORT_SYMBOL(cfg80211_offchan_cac_abort);
 172
 173  int
 174  cfg80211_start_offchan_radar_detection(struct cfg80211_registered_device *rdev,
 175 @@ -1062,7 +1078,7 @@ cfg80211_start_offchan_radar_detection(s
 176         rdev->offchan_radar_chandef = *chandef;
 177         __cfg80211_offchan_cac_event(rdev, wdev, chandef,
 178                                      NL80211_RADAR_CAC_STARTED);
 179 -       queue_delayed_work(cfg80211_wq, &rdev->offchan_cac_work,
 180 +       queue_delayed_work(cfg80211_wq, &rdev->offchan_cac_done_wk,
 181                            msecs_to_jiffies(cac_time_ms));
 182
 183         return 0;