IB/srpt: Disable RDMA access by the initiator

BugLink: http://bugs.launchpad.net/bugs/1745266

commit bec40c26 upstream.

With the SRP protocol all RDMA operations are initiated by the target.
Since no RDMA operations are initiated by the initiator, do not grant
the initiator permission to submit RDMA reads or writes to the target.
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

drivers/infiniband/ulp/srpt/ib_srpt.c

@@ -957,8 +957,7 @@ static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
 		return -ENOMEM;
 
 	attr->qp_state = IB_QPS_INIT;
-	attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
-	    IB_ACCESS_REMOTE_WRITE;
+	attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE;
 	attr->port_num = ch->sport->port;
 	attr->pkey_index = 0;