xprtrdma: Make sure Send CQ is allocated on an existing compvec

mainline inclusion
from mainline-v5.0-rc7
commit a4cb5bdb
category: bugfix
bugzilla: 10737
CVE: NA

-------------------------------------------------

Make sure the device has at least 2 completion vectors
before allocating to compvec#1

Fixes: a4699f56 (xprtrdma: Put Send CQ in IB_POLL_WORKQUEUE mode)
Signed-off-by: NNicolas Morey-Chaisemartin <nmoreychaisemartin@suse.com>
Reviewed-by: NChuck Lever <chuck.lever@oracle.com>
Signed-off-by: NAnna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: NLin Miaohe <linmiaohe@huawei.com>
Reviewed-by: NMao Wenan <maowenan@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

net/sunrpc/xprtrdma/verbs.c

@@ -565,7 +565,8 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
 
 	sendcq = ib_alloc_cq(ia->ri_device, NULL,
 			     ep->rep_attr.cap.max_send_wr + 1,
-			     1, IB_POLL_WORKQUEUE);
+			     ia->ri_device->num_comp_vectors > 1 ? 1 : 0,
+			     IB_POLL_WORKQUEUE);
 	if (IS_ERR(sendcq)) {
 		rc = PTR_ERR(sendcq);
 		dprintk("RPC:       %s: failed to create send CQ: %i\n",