VisionFive2 Linux kernel

StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)

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author: David Teigland <teigland@redhat.com> 2012-03-30 11:46:08 -0500 committer: David Teigland <teigland@redhat.com> 2012-04-26 15:35:38 -0500 commit: 513ef596d43cc35a72ae21170075136855641493 parent: af3a3ab2966112c0d0a44df7eeb1e95fe32d4495
Commit Summary:
dlm: prevent connections during shutdown
Diffstat:
1 file changed, 18 insertions, 7 deletions
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 133ef6dc7cb7..5c1b0e38c7a4 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -142,6 +142,7 @@ struct writequeue_entry {
 
 static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT];
 static int dlm_local_count;
+static int dlm_allow_conn;
 
 /* Work queues */
 static struct workqueue_struct *recv_workqueue;
@@ -710,6 +711,13 @@ static int tcp_accept_from_sock(struct connection *con)
 	struct connection *newcon;
 	struct connection *addcon;
 
+	mutex_lock(&connections_lock);
+	if (!dlm_allow_conn) {
+		mutex_unlock(&connections_lock);
+		return -1;
+	}
+	mutex_unlock(&connections_lock);
+
 	memset(&peeraddr, 0, sizeof(peeraddr));
 	result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM,
 				  IPPROTO_TCP, &newsock);
@@ -1503,6 +1511,7 @@ void dlm_lowcomms_stop(void)
 	   socket activity.
 	*/
 	mutex_lock(&connections_lock);
+	dlm_allow_conn = 0;
 	foreach_conn(stop_conn);
 	mutex_unlock(&connections_lock);
 
@@ -1530,7 +1539,7 @@ int dlm_lowcomms_start(void)
 	if (!dlm_local_count) {
 		error = -ENOTCONN;
 		log_print("no local IP address has been set");
-		goto out;
+		goto fail;
 	}
 
 	error = -ENOMEM;
@@ -1538,7 +1547,13 @@ int dlm_lowcomms_start(void)
 				      __alignof__(struct connection), 0,
 				      NULL);
 	if (!con_cache)
-		goto out;
+		goto fail;
+
+	error = work_start();
+	if (error)
+		goto fail_destroy;
+
+	dlm_allow_conn = 1;
 
 	/* Start listening */
 	if (dlm_config.ci_protocol == 0)
@@ -1548,20 +1563,17 @@ int dlm_lowcomms_start(void)
 	if (error)
 		goto fail_unlisten;
 
-	error = work_start();
-	if (error)
-		goto fail_unlisten;
-
 	return 0;
 
 fail_unlisten:
+	dlm_allow_conn = 0;
 	con = nodeid2con(0,0);
 	if (con) {
 		close_connection(con, false);
 		kmem_cache_free(con_cache, con);
 	}
+fail_destroy:
 	kmem_cache_destroy(con_cache);
-
-out:
+fail:
 	return error;
 }