diff mbox

[2/9] batman-adv: Protect update side of gw_list

Message ID 1284738065-8715-3-git-send-email-sven.eckelmann@gmx.de (mailing list archive)
State Accepted, archived
Headers

Commit Message

Sven Eckelmann Sept. 17, 2010, 3:40 p.m. UTC 
  hlist_add_head_rcu must be protected using gw_list_lock of the current
bat_priv like already done with hlist_del_rcu.

It is important that this lock is now always done using
spin_lock_irqsave because gw_node_add can also be called indirectly from
parts of the kernel with interrupts disabled.

Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
---
 batman-adv/gateway_client.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)
diff mbox

Patch

diff --git a/batman-adv/gateway_client.c b/batman-adv/gateway_client.c
index 6721398..dd96d99 100644
--- a/batman-adv/gateway_client.c
+++ b/batman-adv/gateway_client.c
@@ -196,6 +196,7 @@  static void gw_node_add(struct bat_priv *bat_priv,
 {
 	struct gw_node *gw_node;
 	int down, up;
+	unsigned long flags;
 
 	gw_node = kmalloc(sizeof(struct gw_node), GFP_ATOMIC);
 	if (!gw_node)
@@ -205,7 +206,9 @@  static void gw_node_add(struct bat_priv *bat_priv,
 	INIT_HLIST_NODE(&gw_node->list);
 	gw_node->orig_node = orig_node;
 
+	spin_lock_irqsave(&bat_priv->gw_list_lock, flags);
 	hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list);
+	spin_unlock_irqrestore(&bat_priv->gw_list_lock, flags);
 
 	gw_srv_class_to_kbit(new_gwflags, &down, &up);
 	bat_dbg(DBG_BATMAN, bat_priv,
@@ -273,8 +276,9 @@  void gw_node_purge_deleted(struct bat_priv *bat_priv)
 	struct gw_node *gw_node;
 	struct hlist_node *node, *node_tmp;
 	unsigned long timeout = 2 * PURGE_TIMEOUT * HZ;
+	unsigned long flags;
 
-	spin_lock(&bat_priv->gw_list_lock);
+	spin_lock_irqsave(&bat_priv->gw_list_lock, flags);
 
 	hlist_for_each_entry_safe(gw_node, node, node_tmp,
 						&bat_priv->gw_list, list) {
@@ -286,15 +290,16 @@  void gw_node_purge_deleted(struct bat_priv *bat_priv)
 		}
 	}
 
-	spin_unlock(&bat_priv->gw_list_lock);
+	spin_unlock_irqrestore(&bat_priv->gw_list_lock, flags);
 }
 
 void gw_node_list_free(struct bat_priv *bat_priv)
 {
 	struct gw_node *gw_node;
 	struct hlist_node *node, *node_tmp;
+	unsigned long flags;
 
-	spin_lock(&bat_priv->gw_list_lock);
+	spin_lock_irqsave(&bat_priv->gw_list_lock, flags);
 
 	hlist_for_each_entry_safe(gw_node, node, node_tmp,
 				 &bat_priv->gw_list, list) {
@@ -303,7 +308,7 @@  void gw_node_list_free(struct bat_priv *bat_priv)
 	}
 
 	gw_deselect(bat_priv);
-	spin_unlock(&bat_priv->gw_list_lock);
+	spin_unlock_irqrestore(&bat_priv->gw_list_lock, flags);
 }
 
 static int _write_buffer_text(struct bat_priv *bat_priv,