[PATCH] DLM: Convert connections_lock in a mutex

[Matthias Kaehlcke <matthias@kaehlcke.net>]

Distributed Lock Manager: The semaphore connections_lock is used as a
mutex. Convert it to the mutex API.

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>

--

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 7c1e5e5..adda877 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -138,7 +138,7 @@ static struct workqueue_struct *recv_workqueue;
 static struct workqueue_struct *send_workqueue;
 
 static DEFINE_IDR(connections_idr);
-static DECLARE_MUTEX(connections_lock);
+static DEFINE_MUTEX(connections_lock);
 static int max_nodeid;
 static struct kmem_cache *con_cache;
 
@@ -205,9 +205,9 @@ static struct connection *nodeid2con(int nodeid, gfp_t allocation)
 {
 	struct connection *con;
 
-	down(&connections_lock);
+	mutex_lock(&connections_lock);
 	con = __nodeid2con(nodeid, allocation);
-	up(&connections_lock);
+	mutex_unlock(&connections_lock);
 
 	return con;
 }
@@ -218,15 +218,15 @@ static struct connection *assoc2con(int assoc_id)
 	int i;
 	struct connection *con;
 
-	down(&connections_lock);
+	mutex_lock(&connections_lock);
 	for (i=0; i<=max_nodeid; i++) {
 		con = __nodeid2con(i, 0);
 		if (con && con->sctp_assoc == assoc_id) {
-			up(&connections_lock);
+			mutex_unlock(&connections_lock);
 			return con;
 		}
 	}
-	up(&connections_lock);
+	mutex_unlock(&connections_lock);
 	return NULL;
 }
 
@@ -381,7 +381,7 @@ static void sctp_init_failed(void)
 	int i;
 	struct connection *con;
 
-	down(&connections_lock);
+	mutex_lock(&connections_lock);
 	for (i=1; i<=max_nodeid; i++) {
 		con = __nodeid2con(i, 0);
 		if (!con)
@@ -393,7 +393,7 @@ static void sctp_init_failed(void)
 			}
 		}
 	}
-	up(&connections_lock);
+	mutex_unlock(&connections_lock);
 }
 
 /* Something happened to an association */
@@ -1417,7 +1417,7 @@ void dlm_lowcomms_stop(void)
 	/* Set all the flags to prevent any
 	   socket activity.
 	*/
-	down(&connections_lock);
+	mutex_lock(&connections_lock);
 	for (i = 0; i <= max_nodeid; i++) {
 		con = __nodeid2con(i, 0);
 		if (con) {
@@ -1426,11 +1426,11 @@ void dlm_lowcomms_stop(void)
 				con->sock->sk->sk_user_data = NULL;
 		}
 	}
-	up(&connections_lock);
+	mutex_unlock(&connections_lock);
 
 	work_stop();
 
-	down(&connections_lock);
+	mutex_lock(&connections_lock);
 	clean_writequeues();
 
 	for (i = 0; i <= max_nodeid; i++) {
@@ -1443,7 +1443,7 @@ void dlm_lowcomms_stop(void)
 		}
 	}
 	max_nodeid = 0;
-	up(&connections_lock);
+	mutex_unlock(&connections_lock);
 	kmem_cache_destroy(con_cache);
 	idr_init(&connections_idr);
 }

-- 
Matthias Kaehlcke
Embedded Linux Engineer
Barcelona

    I am incapable of conceiving infinity, and yet I do not accept finity
                          (Simone de Beauvoir)
                                                                 .''`.
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