zmqshell has handle on Kernel

IPython/kernel/comm/comm.py

@@ -27,14 +27,15 b' class Comm(LoggingConfigurable):'
     shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
     def _shell_default(self):
         return get_ipython()
+    
     iopub_socket = Any()
     def _iopub_socket_default(self):
-        return self.shell.parent.iopub_socket
+        return self.shell.kernel.iopub_socket
     session = Instance('IPython.kernel.zmq.session.Session')
     def _session_default(self):
         if self.shell is None:
             return
-        return self.shell.parent.session
+        return self.shell.kernel.session
     
     target = Unicode('comm')
     

IPython/kernel/comm/manager.py

@@ -41,12 +41,12 b' class CommManager(LoggingConfigurable):'
         return get_ipython()
     iopub_socket = Any()
     def _iopub_socket_default(self):
-        return self.shell.parent.iopub_socket
+        return self.shell.kernel.iopub_socket
     session = Instance('IPython.kernel.zmq.session.Session')
     def _session_default(self):
         if self.shell is None:
             return
-        return self.shell.parent.session
+        return self.shell.kernel.session
     
     comms = Dict()
     targets = Dict()

IPython/kernel/zmq/ipkernel.py

@@ -145,6 +145,7 b' class Kernel(Configurable):'
             profile_dir = self.profile_dir,
             user_module = self.user_module,
             user_ns     = self.user_ns,
+            kernel      = self,
         )
         self.shell.displayhook.session = self.session
         self.shell.displayhook.pub_socket = self.iopub_socket

IPython/kernel/zmq/zmqshell.py

@@ -477,6 +477,7 b' class ZMQInteractiveShell(InteractiveShell):'
     displayhook_class = Type(ZMQShellDisplayHook)
     display_pub_class = Type(ZMQDisplayPublisher)
     data_pub_class = Type(ZMQDataPublisher)
+    kernel = Any()
 
     # Override the traitlet in the parent class, because there's no point using
     # readline for the kernel. Can be removed when the readline code is moved