RDMA/qedr: qedr crash while running rdma-tool.

This patch fixes crash caused by querying qp.
This is due the fact that when no traffic is running,
rdma_create_qp hasn't created any qp hence qed->qp is null.

Below call trace is generated while using iproute2 utility
"rdma res show -dd qp" on rdma interface.

==========================================================================
[  302.569794] BUG: kernel NULL pointer dereference, address: 0000000000000034
..
[  302.570378] Hardware name: Dell Inc. PowerEdge R720/0M1GCR, BIOS 1.2.6 05/10/2012
[  302.570500] RIP: 0010:qed_rdma_query_qp+0x33/0x1a0 [qed]
[  302.570861] RSP: 0018:ffffba560a08f580 EFLAGS: 00010206
[  302.570979] RAX: 0000000200000000 RBX: ffffba560a08f5b8 RCX: 0000000000000000
[  302.571100] RDX: ffffba560a08f5b8 RSI: 0000000000000000 RDI: ffff9807ee458090
[  302.571221] RBP: ffffba560a08f5a0 R08: 0000000000000000 R09: ffff9807890e7048
[  302.571342] R10: ffffba560a08f658 R11: 0000000000000000 R12: 0000000000000000
[  302.571462] R13: ffff9807ee458090 R14: ffff9807f0afb000 R15: ffffba560a08f7ec
[  302.571583] FS:  00007fbbf8bfe740(0000) GS:ffff980aafa00000(0000) knlGS:0000000000000000
[  302.571729] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  302.571847] CR2: 0000000000000034 CR3: 00000001720ba001 CR4: 00000000000606f0
[  302.571968] Call Trace:
[  302.572083]  qedr_query_qp+0x82/0x360 [qedr]
[  302.572211]  ib_query_qp+0x34/0x40 [ib_core]
[  302.572361]  ? ib_query_qp+0x34/0x40 [ib_core]
[  302.572503]  fill_res_qp_entry_query.isra.26+0x47/0x1d0 [ib_core]
[  302.572670]  ? __nla_put+0x20/0x30
[  302.572788]  ? nla_put+0x33/0x40
[  302.572901]  fill_res_qp_entry+0xe3/0x120 [ib_core]
[  302.573058]  res_get_common_dumpit+0x3f8/0x5d0 [ib_core]
[  302.573213]  ? fill_res_cm_id_entry+0x1f0/0x1f0 [ib_core]
[  302.573377]  nldev_res_get_qp_dumpit+0x1a/0x20 [ib_core]
[  302.573529]  netlink_dump+0x156/0x2f0
[  302.573648]  __netlink_dump_start+0x1ab/0x260
[  302.573765]  rdma_nl_rcv+0x1de/0x330 [ib_core]
[  302.573918]  ? nldev_res_get_cm_id_dumpit+0x20/0x20 [ib_core]
[  302.574074]  netlink_unicast+0x1b8/0x270
[  302.574191]  netlink_sendmsg+0x33e/0x470
[  302.574307]  sock_sendmsg+0x63/0x70
[  302.574421]  __sys_sendto+0x13f/0x180
[  302.574536]  ? setup_sgl.isra.12+0x70/0xc0
[  302.574655]  __x64_sys_sendto+0x28/0x30
[  302.574769]  do_syscall_64+0x3a/0xb0
[  302.574884]  entry_SYSCALL_64_after_hwframe+0x44/0xae
==========================================================================

Signed-off-by: Ariel Elior <aelior@marvell.com>
Signed-off-by: Shai Malin <smalin@marvell.com>
Signed-off-by: Alok Prasad <palok@marvell.com>

drivers/infiniband/hw/qedr/verbs.c

@@ -2743,15 +2743,18 @@ int qedr_query_qp(struct ib_qp *ibqp,
 	int rc = 0;
 
 	memset(&params, 0, sizeof(params));
-
-	rc = dev->ops->rdma_query_qp(dev->rdma_ctx, qp->qed_qp, &params);
-	if (rc)
-		goto err;
-
 	memset(qp_attr, 0, sizeof(*qp_attr));
 	memset(qp_init_attr, 0, sizeof(*qp_init_attr));
 
-	qp_attr->qp_state = qedr_get_ibqp_state(params.state);
+	if (qp->qed_qp)
+		rc = dev->ops->rdma_query_qp(dev->rdma_ctx,
+					     qp->qed_qp, &params);
+
+	if (qp->qp_type == IB_QPT_GSI)
+		qp_attr->qp_state = QED_ROCE_QP_STATE_RTS;
+	else
+		qp_attr->qp_state = qedr_get_ibqp_state(params.state);
+
 	qp_attr->cur_qp_state = qedr_get_ibqp_state(params.state);
 	qp_attr->path_mtu = ib_mtu_int_to_enum(params.mtu);
 	qp_attr->path_mig_state = IB_MIG_MIGRATED;
@@ -2795,8 +2798,6 @@ int qedr_query_qp(struct ib_qp *ibqp,
 
 	DP_DEBUG(dev, QEDR_MSG_QP, "QEDR_QUERY_QP: max_inline_data=%d\n",
 		 qp_attr->cap.max_inline_data);
-
-err:
 	return rc;
 }