IB/ipath: Fix hang on module unload

Handle the case where posting a send is requested when the link is
down.  This fixes <https://bugs.openfabrics.org/show_bug.cgi?id=1117>.

Signed-off-by: Yannick Cote <yannick.cote@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.c b/drivers/infiniband/hw/ipath/ipath_verbs.c
index b766e40e9ebf..eabc4247860b 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.c
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.c
@@ -340,9 +340,16 @@ static int ipath_post_one_send(struct ipath_qp *qp, struct ib_send_wr *wr)
         int acc;
         int ret;
         unsigned long flags;
+        struct ipath_devdata *dd = to_idev(qp->ibqp.device)->dd;
 
         spin_lock_irqsave(&qp->s_lock, flags);
 
+        if (qp->ibqp.qp_type != IB_QPT_SMI &&
+            !(dd->ipath_flags & IPATH_LINKACTIVE)) {
+                ret = -ENETDOWN;
+                goto bail;
+        }
+
         /* Check that state is OK to post send. */
         if (unlikely(!(ib_ipath_state_ops[qp->state] & IPATH_POST_SEND_OK)))
                 goto bail_inval;