ceph: messenger: rework prepare_connect_authorizer()

Change prepare_connect_authorizer() so it returns without dropping
the connection mutex if the connection has no get_authorizer method.

Use the symbolic CEPH_AUTH_UNKNOWN instead of 0 when assigning
authorization protocols.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>

1 files changed, 19 insertions, 9 deletions

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 8e76936a8c13..09409a3d9500 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -656,19 +656,29 @@ static void prepare_write_keepalive(struct ceph_connection *con)
 static int prepare_connect_authorizer(struct ceph_connection *con)
 {
         void *auth_buf;
-        int auth_len = 0;
-        int auth_protocol = 0;
+        int auth_len;
+        int auth_protocol;
+
+        if (!con->ops->get_authorizer) {
+                con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
+                con->out_connect.authorizer_len = 0;
+
+                return 0;
+        }
+
+        /* Can't hold the mutex while getting authorizer */
 
         mutex_unlock(&con->mutex);
-        if (con->ops->get_authorizer)
-                con->ops->get_authorizer(con, &auth_buf, &auth_len,
-                                         &auth_protocol, &con->auth_reply_buf,
-                                         &con->auth_reply_buf_len,
-                                         con->auth_retry);
+
+        auth_buf = NULL;
+        auth_len = 0;
+        auth_protocol = CEPH_AUTH_UNKNOWN;
+        con->ops->get_authorizer(con, &auth_buf, &auth_len, &auth_protocol,
+                                &con->auth_reply_buf, &con->auth_reply_buf_len,
+                                con->auth_retry);
         mutex_lock(&con->mutex);
 
-        if (test_bit(CLOSED, &con->state) ||
-            test_bit(OPENING, &con->state))
+        if (test_bit(CLOSED, &con->state) || test_bit(OPENING, &con->state))
                 return -EAGAIN;
 
         con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);