libceph: encapsulate some messenger cleanup code

Define a helper function to perform various cleanup operations.  Use
it both in the exit routine and in the init routine in the event of
an error.

Signed-off-by: Alex Elder <elder@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 31f59ac03d8a7fc01bcc3fcf3966aa483533cd0d..c3023a600ad2ccd848dce3708bcbb41a365bcc0b 100644 (file)
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -99,6 +99,20 @@ static void encode_my_addr(struct ceph_messenger *msgr)
  */
 static struct workqueue_struct *ceph_msgr_wq;
 
+void _ceph_msgr_exit(void)
+{
+       if (ceph_msgr_wq)
+               destroy_workqueue(ceph_msgr_wq);
+
+       BUG_ON(zero_page_address == NULL);
+       zero_page_address = NULL;
+
+       BUG_ON(zero_page == NULL);
+       kunmap(zero_page);
+       page_cache_release(zero_page);
+       zero_page = NULL;
+}
+
 int ceph_msgr_init(void)
 {
        BUG_ON(zero_page != NULL);
@@ -109,33 +123,21 @@ int ceph_msgr_init(void)
        zero_page_address = kmap(zero_page);
 
        ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
-       if (!ceph_msgr_wq) {
-               pr_err("msgr_init failed to create workqueue\n");
-
-               zero_page_address = NULL;
-               kunmap(zero_page);
-               page_cache_release(zero_page);
-               zero_page = NULL;
+       if (ceph_msgr_wq)
+               return 0;
 
-               return -ENOMEM;
-       }
+       pr_err("msgr_init failed to create workqueue\n");
+       _ceph_msgr_exit();
 
-       return 0;
+       return -ENOMEM;
 }
 EXPORT_SYMBOL(ceph_msgr_init);
 
 void ceph_msgr_exit(void)
 {
        BUG_ON(ceph_msgr_wq == NULL);
-       destroy_workqueue(ceph_msgr_wq);
 
-       BUG_ON(zero_page_address == NULL);
-       zero_page_address = NULL;
-
-       BUG_ON(zero_page == NULL);
-       kunmap(zero_page);
-       page_cache_release(zero_page);
-       zero_page = NULL;
+       _ceph_msgr_exit();
 }
 EXPORT_SYMBOL(ceph_msgr_exit);