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SubjectRe: [openib-general] Re: [PATCH 1/2] iWARP Connection Manager.
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On Wed, 2006-05-31 at 15:22 -0700, Sean Hefty wrote:
> Steve Wise wrote:
> > +/*
> > + * Release a reference on cm_id. If the last reference is being removed
> > + * and iw_destroy_cm_id is waiting, wake up the waiting thread.
> > + */
> > +static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
> > +{
> > + int ret = 0;
> > +
> > + BUG_ON(atomic_read(&cm_id_priv->refcount)==0);
> > + if (atomic_dec_and_test(&cm_id_priv->refcount)) {
> > + BUG_ON(!list_empty(&cm_id_priv->work_list));
> > + if (waitqueue_active(&cm_id_priv->destroy_wait)) {
> > + BUG_ON(cm_id_priv->state != IW_CM_STATE_DESTROYING);
> > + BUG_ON(test_bit(IWCM_F_CALLBACK_DESTROY,
> > + &cm_id_priv->flags));
> > + ret = 1;
> > + wake_up(&cm_id_priv->destroy_wait);
>
> We recently changed the RDMA CM, IB CM, and a couple of other modules from using
> wait objects to completions. This avoids a race condition between decrementing
> the reference count, which allows destruction to proceed, and calling wake_up on
> a freed cm_id. My guess is that you may need to do the same.
>
> Can you also explain the use of the return value here? It's ignored below in
> rem_ref() and destroy_cm_id().
>
> > +static void add_ref(struct iw_cm_id *cm_id)
> > +{
> > + struct iwcm_id_private *cm_id_priv;
> > + cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
> > + atomic_inc(&cm_id_priv->refcount);
> > +}
> > +
> > +static void rem_ref(struct iw_cm_id *cm_id)
> > +{
> > + struct iwcm_id_private *cm_id_priv;
> > + cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
> > + iwcm_deref_id(cm_id_priv);
> > +}
> > +
>
> > +/*
> > + * CM_ID <-- CLOSING
> > + *
> > + * Block if a passive or active connection is currenlty being processed. Then
> > + * process the event as follows:
> > + * - If we are ESTABLISHED, move to CLOSING and modify the QP state
> > + * based on the abrupt flag
> > + * - If the connection is already in the CLOSING or IDLE state, the peer is
> > + * disconnecting concurrently with us and we've already seen the
> > + * DISCONNECT event -- ignore the request and return 0
> > + * - Disconnect on a listening endpoint returns -EINVAL
> > + */
> > +int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt)
> > +{
> > + struct iwcm_id_private *cm_id_priv;
> > + unsigned long flags;
> > + int ret = 0;
> > +
> > + cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
> > + /* Wait if we're currently in a connect or accept downcall */
> > + wait_event(cm_id_priv->connect_wait,
> > + !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
>
> Am I understanding this check correctly? You're checking to see if the user has
> called iw_cm_disconnect() at the same time that they called iw_cm_connect() or
> iw_cm_accept(). Are connect / accept blocking, or are you just waiting for an
> event?

Yes. The application (or the case I saw was user-mode exit logic after
ctrl-C) cleaning up at random times relative to connection
establishment.

>
> > +
> > + spin_lock_irqsave(&cm_id_priv->lock, flags);
> > + switch (cm_id_priv->state) {
> > + case IW_CM_STATE_ESTABLISHED:
> > + cm_id_priv->state = IW_CM_STATE_CLOSING;
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + if (cm_id_priv->qp) { /* QP could be <nul> for user-mode client */
> > + if (abrupt)
> > + ret = iwcm_modify_qp_err(cm_id_priv->qp);
> > + else
> > + ret = iwcm_modify_qp_sqd(cm_id_priv->qp);
> > + /*
> > + * If both sides are disconnecting the QP could
> > + * already be in ERR or SQD states
> > + */
> > + ret = 0;
> > + }
> > + else
> > + ret = -EINVAL;
> > + break;
> > + case IW_CM_STATE_LISTEN:
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + ret = -EINVAL;
> > + break;
> > + case IW_CM_STATE_CLOSING:
> > + /* remote peer closed first */
> > + case IW_CM_STATE_IDLE:
> > + /* accept or connect returned !0 */
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + break;
> > + case IW_CM_STATE_CONN_RECV:
> > + /*
> > + * App called disconnect before/without calling accept after
> > + * connect_request event delivered.
> > + */
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + break;
> > + case IW_CM_STATE_CONN_SENT:
> > + /* Can only get here if wait above fails */
> > + default:
> > + BUG_ON(1);
> > + }
> > +
> > + return ret;
> > +}
> > +EXPORT_SYMBOL(iw_cm_disconnect);
> > +static void destroy_cm_id(struct iw_cm_id *cm_id)
> > +{
> > + struct iwcm_id_private *cm_id_priv;
> > + unsigned long flags;
> > + int ret;
> > +
> > + cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
> > + /* Wait if we're currently in a connect or accept downcall. A
> > + * listening endpoint should never block here. */
> > + wait_event(cm_id_priv->connect_wait,
> > + !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
>
> Same question/comment as above.
>
> > +
> > + spin_lock_irqsave(&cm_id_priv->lock, flags);
> > + switch (cm_id_priv->state) {
> > + case IW_CM_STATE_LISTEN:
> > + cm_id_priv->state = IW_CM_STATE_DESTROYING;
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + /* destroy the listening endpoint */
> > + ret = cm_id->device->iwcm->destroy_listen(cm_id);
> > + break;
> > + case IW_CM_STATE_ESTABLISHED:
> > + cm_id_priv->state = IW_CM_STATE_DESTROYING;
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + /* Abrupt close of the connection */
> > + (void)iwcm_modify_qp_err(cm_id_priv->qp);
> > + break;
> > + case IW_CM_STATE_IDLE:
> > + case IW_CM_STATE_CLOSING:
> > + cm_id_priv->state = IW_CM_STATE_DESTROYING;
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + break;
> > + case IW_CM_STATE_CONN_RECV:
> > + /*
> > + * App called destroy before/without calling accept after
> > + * receiving connection request event notification.
> > + */
> > + cm_id_priv->state = IW_CM_STATE_DESTROYING;
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + break;
> > + case IW_CM_STATE_CONN_SENT:
> > + case IW_CM_STATE_DESTROYING:
> > + default:
> > + BUG_ON(1);
> > + break;
> > + }
> > +
> > + spin_lock_irqsave(&cm_id_priv->lock, flags);
>
> As an alternative, you could hold the lock from above, an let the LISTEN /
> ESTABLISHED state checks release and reacquire.
>
> > + if (cm_id_priv->qp) {
> > + cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
> > + cm_id_priv->qp = NULL;
> > + }
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > +
> > + (void)iwcm_deref_id(cm_id_priv);
> > +}
> > +
> > +/*
> > + * This function is only called by the application thread and cannot
> > + * be called by the event thread. The function will wait for all
> > + * references to be released on the cm_id and then kfree the cm_id
> > + * object.
> > + */
> > +void iw_destroy_cm_id(struct iw_cm_id *cm_id)
> > +{
> > + struct iwcm_id_private *cm_id_priv;
> > +
> > + cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
> > + BUG_ON(test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags));
> > +
> > + destroy_cm_id(cm_id);
> > +
> > + wait_event(cm_id_priv->destroy_wait,
> > + !atomic_read(&cm_id_priv->refcount));
> > +
> > + kfree(cm_id_priv);
> > +}
> > +EXPORT_SYMBOL(iw_destroy_cm_id);
> > +
> > +/*
> > + * CM_ID <-- LISTEN
> > + *
> > + * Start listening for connect requests. Generates one CONNECT_REQUEST
> > + * event for each inbound connect request.
> > + */
> > +int iw_cm_listen(struct iw_cm_id *cm_id, int backlog)
> > +{
> > + struct iwcm_id_private *cm_id_priv;
> > + unsigned long flags;
> > + int ret = 0;
> > +
> > + cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
> > + spin_lock_irqsave(&cm_id_priv->lock, flags);
> > + switch (cm_id_priv->state) {
> > + case IW_CM_STATE_IDLE:
> > + cm_id_priv->state = IW_CM_STATE_LISTEN;
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + ret = cm_id->device->iwcm->create_listen(cm_id, backlog);
> > + if (ret)
> > + cm_id_priv->state = IW_CM_STATE_IDLE;
> > + break;
> > + default:
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + ret = -EINVAL;
> > + }
> > +
> > + return ret;
> > +}
> > +EXPORT_SYMBOL(iw_cm_listen);
> > +
> > +/*
> > + * CM_ID <-- IDLE
> > + *
> > + * Rejects an inbound connection request. No events are generated.
> > + */
> > +int iw_cm_reject(struct iw_cm_id *cm_id,
> > + const void *private_data,
> > + u8 private_data_len)
> > +{
> > + struct iwcm_id_private *cm_id_priv;
> > + unsigned long flags;
> > + int ret;
> > +
> > + cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
> > + set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
> > +
> > + spin_lock_irqsave(&cm_id_priv->lock, flags);
> > + if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
> > + wake_up_all(&cm_id_priv->connect_wait);
> > + return -EINVAL;
> > + }
> > + cm_id_priv->state = IW_CM_STATE_IDLE;
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > +
> > + ret = cm_id->device->iwcm->reject(cm_id, private_data,
> > + private_data_len);
> > +
> > + clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
> > + wake_up_all(&cm_id_priv->connect_wait);
> > +
> > + return ret;
> > +}
> > +EXPORT_SYMBOL(iw_cm_reject);
> > +
> > +/*
> > + * CM_ID <-- ESTABLISHED
> > + *
> > + * Accepts an inbound connection request and generates an ESTABLISHED
> > + * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block
> > + * until the ESTABLISHED event is received from the provider.
> > + */
>
> This makes it sound like we're just waiting for an event.
>
> > +int iw_cm_accept(struct iw_cm_id *cm_id,
> > + struct iw_cm_conn_param *iw_param)
> > +{
> > + struct iwcm_id_private *cm_id_priv;
> > + struct ib_qp *qp;
> > + unsigned long flags;
> > + int ret;
> > +
> > + cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
> > + set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
> > +
> > + spin_lock_irqsave(&cm_id_priv->lock, flags);
> > + if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
> > + wake_up_all(&cm_id_priv->connect_wait);
> > + return -EINVAL;
> > + }
> > + /* Get the ib_qp given the QPN */
> > + qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
> > + if (!qp) {
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + return -EINVAL;
> > + }
> > + cm_id->device->iwcm->add_ref(qp);
> > + cm_id_priv->qp = qp;
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > +
> > + ret = cm_id->device->iwcm->accept(cm_id, iw_param);
> > + if (ret) {
> > + /* An error on accept precludes provider events */
> > + BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
> > + cm_id_priv->state = IW_CM_STATE_IDLE;
> > + spin_lock_irqsave(&cm_id_priv->lock, flags);
> > + if (cm_id_priv->qp) {
> > + cm_id->device->iwcm->rem_ref(qp);
> > + cm_id_priv->qp = NULL;
> > + }
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + printk("Accept failed, ret=%d\n", ret);
> > + clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
> > + wake_up_all(&cm_id_priv->connect_wait);
> > + }
> > +
> > + return ret;
> > +}
> > +EXPORT_SYMBOL(iw_cm_accept);
> > +
> > +/*
> > + * Active Side: CM_ID <-- CONN_SENT
> > + *
> > + * If successful, results in the generation of a CONNECT_REPLY
> > + * event. iw_cm_disconnect and iw_cm_destroy will block until the
> > + * CONNECT_REPLY event is received from the provider.
> > + */
> > +int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param)
> > +{
> > + struct iwcm_id_private *cm_id_priv;
> > + int ret = 0;
> > + unsigned long flags;
> > + struct ib_qp *qp;
> > +
> > + cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
> > + set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
> > +
> > + spin_lock_irqsave(&cm_id_priv->lock, flags);
> > + if (cm_id_priv->state != IW_CM_STATE_IDLE) {
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
> > + wake_up_all(&cm_id_priv->connect_wait);
> > + return -EINVAL;
> > + }
> > +
> > + /* Get the ib_qp given the QPN */
> > + qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
> > + if (!qp) {
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + return -EINVAL;
> > + }
> > + cm_id->device->iwcm->add_ref(qp);
> > + cm_id_priv->qp = qp;
> > + cm_id_priv->state = IW_CM_STATE_CONN_SENT;
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > +
> > + ret = cm_id->device->iwcm->connect(cm_id, iw_param);
> > + if (ret) {
> > + spin_lock_irqsave(&cm_id_priv->lock, flags);
> > + if (cm_id_priv->qp) {
> > + cm_id->device->iwcm->rem_ref(qp);
> > + cm_id_priv->qp = NULL;
> > + }
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
> > + cm_id_priv->state = IW_CM_STATE_IDLE;
> > + printk("Connect failed, ret=%d\n", ret);
> > + clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
> > + wake_up_all(&cm_id_priv->connect_wait);
> > + }
> > +
> > + return ret;
> > +}
> > +EXPORT_SYMBOL(iw_cm_connect);
> > +
> > +/*
> > + * Passive Side: new CM_ID <-- CONN_RECV
> > + *
> > + * Handles an inbound connect request. The function creates a new
> > + * iw_cm_id to represent the new connection and inherits the client
> > + * callback function and other attributes from the listening parent.
> > + *
> > + * The work item contains a pointer to the listen_cm_id and the event. The
> > + * listen_cm_id contains the client cm_handler, context and
> > + * device. These are copied when the device is cloned. The event
> > + * contains the new four tuple.
> > + *
> > + * An error on the child should not affect the parent, so this
> > + * function does not return a value.
> > + */
> > +static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv,
> > + struct iw_cm_event *iw_event)
> > +{
> > + unsigned long flags;
> > + struct iw_cm_id *cm_id;
> > + struct iwcm_id_private *cm_id_priv;
> > + int ret;
> > +
> > + /* The provider should never generate a connection request
> > + * event with a bad status.
> > + */
> > + BUG_ON(iw_event->status);
> > +
> > + /* We could be destroying the listening id. If so, ignore this
> > + * upcall. */
> > + spin_lock_irqsave(&listen_id_priv->lock, flags);
> > + if (listen_id_priv->state != IW_CM_STATE_LISTEN) {
> > + spin_unlock_irqrestore(&listen_id_priv->lock, flags);
> > + return;
> > + }
> > + spin_unlock_irqrestore(&listen_id_priv->lock, flags);
> > +
> > + cm_id = iw_create_cm_id(listen_id_priv->id.device,
> > + listen_id_priv->id.cm_handler,
> > + listen_id_priv->id.context);
> > + /* If the cm_id could not be created, ignore the request */
> > + if (IS_ERR(cm_id))
> > + return;
> > +
> > + cm_id->provider_data = iw_event->provider_data;
> > + cm_id->local_addr = iw_event->local_addr;
> > + cm_id->remote_addr = iw_event->remote_addr;
> > +
> > + cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
> > + cm_id_priv->state = IW_CM_STATE_CONN_RECV;
> > +
> > + /* Call the client CM handler */
> > + ret = cm_id->cm_handler(cm_id, iw_event);
> > + if (ret) {
> > + printk("destroying child id %p, ret=%d\n",
> > + cm_id, ret);
>
> We probably don't always want to print a message here.
>
> > + set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
> > + destroy_cm_id(cm_id);
> > + if (atomic_read(&cm_id_priv->refcount)==0)
> > + kfree(cm_id);
> > + }
> > +}
> > +
> > +/*
> > + * Passive Side: CM_ID <-- ESTABLISHED
> > + *
> > + * The provider generated an ESTABLISHED event which means that
> > + * the MPA negotion has completed successfully and we are now in MPA
> > + * FPDU mode.
> > + *
> > + * This event can only be received in the CONN_RECV state. If the
> > + * remote peer closed, the ESTABLISHED event would be received followed
> > + * by the CLOSE event. If the app closes, it will block until we wake
> > + * it up after processing this event.
> > + */
> > +static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv,
> > + struct iw_cm_event *iw_event)
> > +{
> > + unsigned long flags;
> > + int ret = 0;
> > +
> > + spin_lock_irqsave(&cm_id_priv->lock, flags);
> > +
> > + /* We clear the CONNECT_WAIT bit here to allow the callback
> > + * function to call iw_cm_disconnect. Calling iw_destroy_cm_id
> > + * from a callback handler is not allowed */
> > + clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
> > + switch (cm_id_priv->state) {
> > + case IW_CM_STATE_CONN_RECV:
> > + cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
> > + break;
> > + default:
> > + BUG_ON(1);
>
> Can just BUG_ON the state and avoid the switch. Same comment applies below.
>
> > + }
> > + wake_up_all(&cm_id_priv->connect_wait);
> > +
> > + return ret;
> > +}
> > +
> > +/*
> > + * Active Side: CM_ID <-- ESTABLISHED
> > + *
> > + * The app has called connect and is waiting for the established event to
> > + * post it's requests to the server. This event will wake up anyone
> > + * blocked in iw_cm_disconnect or iw_destroy_id.
> > + */
> > +static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv,
> > + struct iw_cm_event *iw_event)
> > +{
> > + unsigned long flags;
> > + int ret = 0;
> > +
> > + spin_lock_irqsave(&cm_id_priv->lock, flags);
> > + /* Clear the connect wait bit so a callback function calling
> > + * iw_cm_disconnect will not wait and deadlock this thread */
> > + clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
> > + switch (cm_id_priv->state) {
> > + case IW_CM_STATE_CONN_SENT:
> > + if (iw_event->status == IW_CM_EVENT_STATUS_ACCEPTED) {
> > + cm_id_priv->id.local_addr = iw_event->local_addr;
> > + cm_id_priv->id.remote_addr = iw_event->remote_addr;
> > + cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
> > + } else {
> > + /* REJECTED or RESET */
> > + cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
> > + cm_id_priv->qp = NULL;
> > + cm_id_priv->state = IW_CM_STATE_IDLE;
> > + }
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > + ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
> > + break;
> > + default:
> > + BUG_ON(1);
> > + }
> > + /* Wake up waiters on connect complete */
> > + wake_up_all(&cm_id_priv->connect_wait);
> > +
> > + return ret;
> > +}
> > +
> > +/*
> > + * CM_ID <-- CLOSING
> > + *
> > + * If in the ESTABLISHED state, move to CLOSING.
> > + */
> > +static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv,
> > + struct iw_cm_event *iw_event)
> > +{
> > + unsigned long flags;
> > +
> > + spin_lock_irqsave(&cm_id_priv->lock, flags);
> > + if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED)
> > + cm_id_priv->state = IW_CM_STATE_CLOSING;
> > + spin_unlock_irqrestore(&cm_id_priv->lock, flags);
> > +}
> > +
> > +/*
> > + * CM_ID <-- IDLE
> > + *
> > + * If in the ESTBLISHED or CLOSING states, the QP will have have been
> > + * moved by the provider to the ERR state. Disassociate the CM_ID from
> > + * the QP, move to IDLE, and remove the 'connected' reference.
> > + *
> > + * If in some other state, the cm_id was destroyed asynchronously.
> > + * This is the last reference that will result in waking up
> > + * the app thread blocked in iw_destroy_cm_id.
> > + */
> > +static int cm_close_handler(struct iwcm_id_private *cm_id_priv,
> > + struct iw_cm_event *iw_event)
> > +{
> > + unsigned long flags;
> > + int ret = 0;
> > + /* TT */printk("%s:%d cm_id_priv=%p, state=%d\n",
> > + __FUNCTION__, __LINE__,
> > + cm_id_priv,cm_id_priv->state);
>
> Will want to remove this.
>
> - Sean
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