RDMA/hns: Use GFP_ATOMIC under spin lock

A spin lock is taken here so we should use GFP_ATOMIC.

Fixes: f91696f2f0 ("RDMA/hns: Support congestion control type selection according to the FW")
Link: https://lore.kernel.org/r/20210407154900.3486268-1-weiyongjun1@huawei.com
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -4621,7 +4621,7 @@ static int get_dip_ctx_idx(struct ib_qp *ibqp, const struct ib_qp_attr *attr,
 	/* If no dgid is found, a new dip and a mapping between dgid and
 	 * dip_idx will be created.
 	 */
-	hr_dip = kzalloc(sizeof(*hr_dip), GFP_KERNEL);
+	hr_dip = kzalloc(sizeof(*hr_dip), GFP_ATOMIC);
 	if (!hr_dip) {
 		ret = -ENOMEM;
 		goto out;