-static spinlock_t conn_lock;
-static struct list_head conn_list;
-static struct list_head conn_unused_list;
+int ptlrpc_connection_put(struct ptlrpc_connection *conn)
+{
+ int rc = 0;
+ ENTRY;
+
+ if (!conn)
+ RETURN(rc);
+
+ LASSERT(!cfs_hlist_unhashed(&conn->c_hash));
+
+ /*
+ * We do not remove connection from hashtable and
+ * do not free it even if last caller released ref,
+ * as we want to have it cached for the case it is
+ * needed again.
+ *
+ * Deallocating it and later creating new connection
+ * again would be wastful. This way we also avoid
+ * expensive locking to protect things from get/put
+ * race when found cached connection is freed by
+ * ptlrpc_connection_put().
+ *
+ * It will be freed later in module unload time,
+ * when ptlrpc_connection_fini()->lh_exit->conn_exit()
+ * path is called.
+ */
+ if (cfs_atomic_dec_return(&conn->c_refcount) == 1)
+ rc = 1;
+
+ CDEBUG(D_INFO, "PUT conn=%p refcount %d to %s\n",
+ conn, cfs_atomic_read(&conn->c_refcount),
+ libcfs_nid2str(conn->c_peer.nid));
+
+ RETURN(rc);
+}