From: Johannes Berg <johannes.berg@intel.com>
Date: Tue, 11 Sep 2012 08:17:11 +0000 (+0200)
Subject: mac80211: change locking around ieee80211_recalc_smps
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5d8e4237d2dc73b51ac66dc612c5c42dd7424479;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

mac80211: change locking around ieee80211_recalc_smps

Make the function acquire the necessary mutex itself
to simplify the callers.

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

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 00e31b488adc..9bd56a744982 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -2070,9 +2070,7 @@ int __ieee80211_request_smps(struct ieee80211_sub_if_data *sdata,
 	 */
 	if (!sdata->u.mgd.associated ||
 	    sdata->vif.bss_conf.channel_type == NL80211_CHAN_NO_HT) {
-		mutex_lock(&sdata->local->iflist_mtx);
 		ieee80211_recalc_smps(sdata->local);
-		mutex_unlock(&sdata->local->iflist_mtx);
 		return 0;
 	}
 
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 416e85eae2d2..c80c4490351c 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -364,9 +364,7 @@ static void ieee80211_recalc_smps_work(struct work_struct *work)
 	struct ieee80211_local *local =
 		container_of(work, struct ieee80211_local, recalc_smps);
 
-	mutex_lock(&local->iflist_mtx);
 	ieee80211_recalc_smps(local);
-	mutex_unlock(&local->iflist_mtx);
 }
 
 #ifdef CONFIG_INET
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 45a9fa63b368..2dbd9e1e3583 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1348,9 +1348,9 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 
 	mutex_lock(&local->iflist_mtx);
 	ieee80211_recalc_ps(local, -1);
-	ieee80211_recalc_smps(local);
 	mutex_unlock(&local->iflist_mtx);
 
+	ieee80211_recalc_smps(local);
 	ieee80211_recalc_ps_vif(sdata);
 
 	netif_tx_start_all_queues(sdata->dev);
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 2017904c69cc..22ca35054dd0 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1606,14 +1606,13 @@ static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
 	return 0;
 }
 
-/* must hold iflist_mtx */
 void ieee80211_recalc_smps(struct ieee80211_local *local)
 {
 	struct ieee80211_sub_if_data *sdata;
 	enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
 	int count = 0;
 
-	lockdep_assert_held(&local->iflist_mtx);
+	mutex_lock(&local->iflist_mtx);
 
 	/*
 	 * This function could be improved to handle multiple
@@ -1642,12 +1641,14 @@ void ieee80211_recalc_smps(struct ieee80211_local *local)
 	}
 
 	if (smps_mode == local->smps_mode)
-		return;
+		goto unlock;
 
  set:
 	local->smps_mode = smps_mode;
 	/* changed flag is auto-detected for this */
 	ieee80211_hw_config(local, 0);
+ unlock:
+	mutex_unlock(&local->iflist_mtx);
 }
 
 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)