mac80211: remove unused and unneeded remove_sta_debugfs callback

The remove_sta_debugfs callback in struct rate_control_ops is no longer
used by any driver, as there is no need for it (the debugfs directory is
already removed recursivly by the mac80211 core.)  Because no one needs
it, just remove it to keep anyone else from accidentally using it in the
future.

Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20190612142658.12792-5-gregkh@linuxfoundation.orgSigned-off-by: NJohannes Berg <johannes.berg@intel.com>

include/net/mac80211.h

@@ -5946,7 +5946,6 @@ struct rate_control_ops {
 
 	void (*add_sta_debugfs)(void *priv, void *priv_sta,
 				struct dentry *dir);
-	void (*remove_sta_debugfs)(void *priv, void *priv_sta);
 
 	u32 (*get_expected_throughput)(void *priv_sta);
 };

net/mac80211/rate.h

@@ -60,15 +60,6 @@ static inline void rate_control_add_sta_debugfs(struct sta_info *sta)
 #endif
 }
 
-static inline void rate_control_remove_sta_debugfs(struct sta_info *sta)
-{
-#ifdef CONFIG_MAC80211_DEBUGFS
-	struct rate_control_ref *ref = sta->rate_ctrl;
-	if (ref && ref->ops->remove_sta_debugfs)
-		ref->ops->remove_sta_debugfs(ref->priv, sta->rate_ctrl_priv);
-#endif
-}
-
 void ieee80211_check_rate_mask(struct ieee80211_sub_if_data *sdata);
 
 /* Get a reference to the rate control algorithm. If `name' is NULL, get the

net/mac80211/sta_info.c

@@ -1065,7 +1065,6 @@ static void __sta_info_destroy_part2(struct sta_info *sta)
 	cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
 	kfree(sinfo);
 
-	rate_control_remove_sta_debugfs(sta);
 	ieee80211_sta_debugfs_remove(sta);
 
 	cleanup_single_sta(sta);