cfg80211: reduce monitor interface tracking

Revert commit b78e8ceac23655e1e06b30aa95ab11742d1ac7c0
("cfg80211: track monitor channel") and remove the
set_monitor_enabled() callback.

Due to the tracking happening in NETDEV_PRE_UP, it had
introduced bugs because the monitor interface callback
would be called before the device was started. It looks
like there's no way to fix this, and using NETDEV_PRE_UP
is broken anyway (since there's no NETDEV_UP_FAIL), so
remove all that code, track interfaces in NETDEV_UP and
also stop tracking the monitor channel in cfg80211.

This mostly reverts to before the tracking, except that
we keep the interface count tracking so that setting the
monitor channel can be rejected properly.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 1 insertions, 47 deletions

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 0557bb15902..71b684b5a67 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -736,60 +736,14 @@ static struct device_type wiphy_type = {
 	.name	= "wlan",
 };
 
-static struct ieee80211_channel *
-cfg80211_get_any_chan(struct cfg80211_registered_device *rdev)
-{
-	struct ieee80211_supported_band *sband;
-	int i;
-
-	for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
-		sband = rdev->wiphy.bands[i];
-		if (sband && sband->n_channels > 0)
-			return &sband->channels[0];
-	}
-
-	return NULL;
-}
-
-static void cfg80211_init_mon_chan(struct cfg80211_registered_device *rdev)
-{
-	struct ieee80211_channel *chan;
-
-	chan = cfg80211_get_any_chan(rdev);
-	if (WARN_ON(!chan))
-		return;
-
-	mutex_lock(&rdev->devlist_mtx);
-	WARN_ON(cfg80211_set_monitor_channel(rdev, chan->center_freq,
-					     NL80211_CHAN_NO_HT));
-	mutex_unlock(&rdev->devlist_mtx);
-}
-
 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 			       enum nl80211_iftype iftype, int num)
 {
-	bool has_monitors_only_old = cfg80211_has_monitors_only(rdev);
-	bool has_monitors_only_new;
-
 	ASSERT_RTNL();
 
 	rdev->num_running_ifaces += num;
 	if (iftype == NL80211_IFTYPE_MONITOR)
 		rdev->num_running_monitor_ifaces += num;
-
-	has_monitors_only_new = cfg80211_has_monitors_only(rdev);
-	if (has_monitors_only_new != has_monitors_only_old) {
-		if (rdev->ops->set_monitor_enabled)
-			rdev->ops->set_monitor_enabled(&rdev->wiphy,
-						       has_monitors_only_new);
-
-		if (!has_monitors_only_new) {
-			rdev->monitor_channel = NULL;
-			rdev->monitor_channel_type = NL80211_CHAN_NO_HT;
-		} else {
-			cfg80211_init_mon_chan(rdev);
-		}
-	}
 }
 
 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
@@ -912,6 +866,7 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 			mutex_unlock(&rdev->devlist_mtx);
 			dev_put(dev);
 		}
+		cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 		cfg80211_lock_rdev(rdev);
 		mutex_lock(&rdev->devlist_mtx);
 		wdev_lock(wdev);
@@ -1006,7 +961,6 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 		mutex_unlock(&rdev->devlist_mtx);
 		if (ret)
 			return notifier_from_errno(ret);
-		cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 		break;
 	}