Merge tag 'batadv-next-for-davem-20191105' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
This feature/cleanup patchset includes the following patches:

 - bump version strings, by Simon Wunderlich

 - Simplify batadv_v_ogm_aggr_list_free using skb_queue_purge,
   by Christophe Jaillet

 - Replace aggr_list_lock with lock free skb handlers,
   by Christophe Jaillet

 - explicitly mark fallthrough cases, by Sven Eckelmann

 - Drop lockdep.h include from soft-interface.c, by Sven Eckelmann
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 19 insertions, 28 deletions

diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c
index 64054edc2e3c..4ff6cf1ecae7 100644
--- a/net/batman-adv/bat_v.c
+++ b/net/batman-adv/bat_v.c
@@ -1085,7 +1085,6 @@ void batadv_v_hardif_init(struct batadv_hard_iface *hard_iface)
 
 	hard_iface->bat_v.aggr_len = 0;
 	skb_queue_head_init(&hard_iface->bat_v.aggr_list);
-	spin_lock_init(&hard_iface->bat_v.aggr_list_lock);
 	INIT_DELAYED_WORK(&hard_iface->bat_v.aggr_wq,
 			  batadv_v_ogm_aggr_work);
 }
diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c
index 8033f24f506c..714ce56cfcc8 100644
--- a/net/batman-adv/bat_v_ogm.c
+++ b/net/batman-adv/bat_v_ogm.c
@@ -152,7 +152,7 @@ static unsigned int batadv_v_ogm_len(struct sk_buff *skb)
  * @skb: the OGM to check
  * @hard_iface: the interface to use to send the OGM
  *
- * Caller needs to hold the hard_iface->bat_v.aggr_list_lock.
+ * Caller needs to hold the hard_iface->bat_v.aggr_list.lock.
  *
  * Return: True, if the given OGMv2 packet still fits, false otherwise.
  */
@@ -163,7 +163,7 @@ static bool batadv_v_ogm_queue_left(struct sk_buff *skb,
 				 BATADV_MAX_AGGREGATION_BYTES);
 	unsigned int ogm_len = batadv_v_ogm_len(skb);
 
-	lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock);
+	lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock);
 
 	return hard_iface->bat_v.aggr_len + ogm_len <= max;
 }
@@ -174,17 +174,13 @@ static bool batadv_v_ogm_queue_left(struct sk_buff *skb,
  *
  * Empties the OGMv2 aggregation queue and frees all the skbs it contained.
  *
- * Caller needs to hold the hard_iface->bat_v.aggr_list_lock.
+ * Caller needs to hold the hard_iface->bat_v.aggr_list.lock.
  */
 static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface)
 {
-	struct sk_buff *skb;
-
-	lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock);
-
-	while ((skb = skb_dequeue(&hard_iface->bat_v.aggr_list)))
-		kfree_skb(skb);
+	lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock);
 
+	__skb_queue_purge(&hard_iface->bat_v.aggr_list);
 	hard_iface->bat_v.aggr_len = 0;
 }
 
@@ -197,7 +193,7 @@ static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface)
  *
  * The aggregation queue is empty after this call.
  *
- * Caller needs to hold the hard_iface->bat_v.aggr_list_lock.
+ * Caller needs to hold the hard_iface->bat_v.aggr_list.lock.
  */
 static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface)
 {
@@ -206,7 +202,7 @@ static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface)
 	unsigned int ogm_len;
 	struct sk_buff *skb;
 
-	lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock);
+	lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock);
 
 	if (!aggr_len)
 		return;
@@ -220,7 +216,7 @@ static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface)
 	skb_reserve(skb_aggr, ETH_HLEN + NET_IP_ALIGN);
 	skb_reset_network_header(skb_aggr);
 
-	while ((skb = skb_dequeue(&hard_iface->bat_v.aggr_list))) {
+	while ((skb = __skb_dequeue(&hard_iface->bat_v.aggr_list))) {
 		hard_iface->bat_v.aggr_len -= batadv_v_ogm_len(skb);
 
 		ogm_len = batadv_v_ogm_len(skb);
@@ -247,13 +243,13 @@ static void batadv_v_ogm_queue_on_if(struct sk_buff *skb,
 		return;
 	}
 
-	spin_lock_bh(&hard_iface->bat_v.aggr_list_lock);
+	spin_lock_bh(&hard_iface->bat_v.aggr_list.lock);
 	if (!batadv_v_ogm_queue_left(skb, hard_iface))
 		batadv_v_ogm_aggr_send(hard_iface);
 
 	hard_iface->bat_v.aggr_len += batadv_v_ogm_len(skb);
-	skb_queue_tail(&hard_iface->bat_v.aggr_list, skb);
-	spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock);
+	__skb_queue_tail(&hard_iface->bat_v.aggr_list, skb);
+	spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock);
 }
 
 /**
@@ -392,9 +388,9 @@ void batadv_v_ogm_aggr_work(struct work_struct *work)
 	batv = container_of(work, struct batadv_hard_iface_bat_v, aggr_wq.work);
 	hard_iface = container_of(batv, struct batadv_hard_iface, bat_v);
 
-	spin_lock_bh(&hard_iface->bat_v.aggr_list_lock);
+	spin_lock_bh(&hard_iface->bat_v.aggr_list.lock);
 	batadv_v_ogm_aggr_send(hard_iface);
-	spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock);
+	spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock);
 
 	batadv_v_ogm_start_queue_timer(hard_iface);
 }
@@ -425,9 +421,9 @@ void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
 {
 	cancel_delayed_work_sync(&hard_iface->bat_v.aggr_wq);
 
-	spin_lock_bh(&hard_iface->bat_v.aggr_list_lock);
+	spin_lock_bh(&hard_iface->bat_v.aggr_list.lock);
 	batadv_v_ogm_aggr_list_free(hard_iface);
-	spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock);
+	spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock);
 }
 
 /**
diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index 6967f2e4c3f4..c7b340ddd0e7 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -13,7 +13,7 @@
 #define BATADV_DRIVER_DEVICE "batman-adv"
 
 #ifndef BATADV_SOURCE_VERSION
-#define BATADV_SOURCE_VERSION "2019.4"
+#define BATADV_SOURCE_VERSION "2019.5"
 #endif
 
 /* B.A.T.M.A.N. parameters */
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index 1d5bdf3a4b65..f9ec8e7507b6 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -1421,7 +1421,7 @@ batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
 		if (*orig)
 			return BATADV_FORW_SINGLE;
 
-		/* fall through */
+		fallthrough;
 	case 0:
 		return BATADV_FORW_NONE;
 	default:
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 5ee8e9a100f9..832e156c519e 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -22,7 +22,6 @@
 #include <linux/kernel.h>
 #include <linux/kref.h>
 #include <linux/list.h>
-#include <linux/lockdep.h>
 #include <linux/netdevice.h>
 #include <linux/netlink.h>
 #include <linux/percpu.h>
@@ -230,7 +229,7 @@ static netdev_tx_t batadv_interface_tx(struct sk_buff *skb,
 			break;
 		}
 
-		/* fall through */
+		fallthrough;
 	case ETH_P_BATMAN:
 		goto dropped;
 	}
@@ -455,7 +454,7 @@ void batadv_interface_rx(struct net_device *soft_iface,
 		if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))
 			break;
 
-		/* fall through */
+		fallthrough;
 	case ETH_P_BATMAN:
 		goto dropped;
 	}
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 4d7f1baee7b7..47718a82eaf2 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -130,9 +130,6 @@ struct batadv_hard_iface_bat_v {
 	/** @aggr_len: size of the OGM aggregate (excluding ethernet header) */
 	unsigned int aggr_len;
 
-	/** @aggr_list_lock: protects aggr_list */
-	spinlock_t aggr_list_lock;
-
 	/**
 	 * @throughput_override: throughput override to disable link
 	 *  auto-detection