RDMA/cxgb3: Handle NULL inetdev pointer in iwch_query_port()

in_dev_get() can return NULL.  If it does, iwch_query_port() will crash.
Handle the NULL case by mapping it to port state INIT.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c
index 6895523..03cfaec 100644 (file)
--- a/drivers/infiniband/hw/cxgb3/iwch_provider.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c
@@ -1199,11 +1199,14 @@ static int iwch_query_port(struct ib_device *ibdev,
                props->state = IB_PORT_DOWN;
        else {
                inetdev = in_dev_get(netdev);
-               if (inetdev->ifa_list)
-                       props->state = IB_PORT_ACTIVE;
-               else
+               if (inetdev) {
+                       if (inetdev->ifa_list)
+                               props->state = IB_PORT_ACTIVE;
+                       else
+                               props->state = IB_PORT_INIT;
+                       in_dev_put(inetdev);
+               } else
                        props->state = IB_PORT_INIT;
-               in_dev_put(inetdev);
        }
 
        props->port_cap_flags =