[PATCH 14/17] ib/cm: Do not automatically disconnect XRC TGT QPs

["Hefty, Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

Because an XRC TGT QP can end up being shared among multiple
processes, don't have the ib_cm automatically send a DREQ
when the user space process that owns the ib_cm_id exits.
Disconnect can be initiated by the user directly, otherwise,
the owner of the XRC INI QP controls the connection.

Note that as a result of the process exiting, the ib_cm will
stop tracking the XRC connection on the target side.  For the
purposes of disconnecting, this isn't a big deal.  The ib_cm
will respond to the DREQ appropriately.  For other messages,
mainly LAP, the cm will reject the request, since there's no
one available to route the request to.

Signed-off-by: Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
This is a simple way of handling XRX TGT QPs.  A more complex
method can always be added later if and when it is ever necessary.

 drivers/infiniband/core/cm.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 7577c1a..67c7da4 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -889,6 +889,8 @@ retest:
 		break;
 	case IB_CM_ESTABLISHED:
 		spin_unlock_irq(&cm_id_priv->lock);
+		if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
+			break;
 		ib_send_cm_dreq(cm_id, NULL, 0);
 		goto retest;
 	case IB_CM_DREQ_SENT:


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