RDMA/hns: Fix non-standard error codes

It is better to return a linux error code than define a private constant.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Yixian Liu <[e-mail]>
Signed-off-by: Wenpeng Liang <[e-mail]>
Signed-off-by: Weihang Li <[e-mail]>
Signed-off-by: Jason Gunthorpe <[e-mail]>

drivers/infiniband/hw/hns/hns_roce_alloc.c

···
 			bitmap->last = 0;
 		*obj |= bitmap->top;
 	} else {
-		ret = -1;
+		ret = -EINVAL;
 	}
 
 	spin_unlock(&bitmap->lock);
···
 		}
 		*obj |= bitmap->top;
 	} else {
-		ret = -1;
+		ret = -EINVAL;
 	}
 
 	spin_unlock(&bitmap->lock);

drivers/infiniband/hw/hns/hns_roce_cq.c

···
 	hr_cq->vector = vector;
 
 	ret = hns_roce_bitmap_alloc(&cq_table->bitmap, &hr_cq->cqn);
-	if (ret == -1) {
+	if (ret) {
 		dev_err(dev, "CQ alloc.Failed to alloc index.\n");
-		return -ENOMEM;
+		return ret;
 	}
 
 	/* Get CQC memory HEM(Hardware Entry Memory) table */

drivers/infiniband/hw/hns/hns_roce_mr.c

···
 		}
 	}
 	spin_unlock(&buddy->lock);
-	return -1;
+	return -EINVAL;
 
  found:
 	clear_bit(*seg, buddy->bits[o]);
···
 	}
 
 	ret = hns_roce_buddy_alloc(buddy, order, seg);
-	if (ret == -1)
-		return -1;
+	if (ret)
+		return ret;
 
-	if (hns_roce_table_get_range(hr_dev, table, *seg,
-				     *seg + (1 << order) - 1)) {
+	ret = hns_roce_table_get_range(hr_dev, table, *seg,
+				       *seg + (1 << order) - 1);
+	if (ret) {
 		hns_roce_buddy_free(buddy, *seg, order);
-		return -1;
+		return ret;
 	}
 
 	return 0;
···
 
 	/* Allocate a key for mr from mr_table */
 	ret = hns_roce_bitmap_alloc(&hr_dev->mr_table.mtpt_bitmap, &index);
-	if (ret == -1)
+	if (ret)
 		return -ENOMEM;
 
 	mr->iova = iova;			/* MR va starting addr */

drivers/infiniband/hw/hns/hns_roce_pd.c

···
 
 	/* Using bitmap to manager UAR index */
 	ret = hns_roce_bitmap_alloc(&hr_dev->uar_table.bitmap, &uar->logic_idx);
-	if (ret == -1)
+	if (ret)
 		return -ENOMEM;
 
 	if (uar->logic_idx > 0 && hr_dev->caps.phy_num_uars > 1)

drivers/infiniband/hw/hns/hns_roce_srq.c

···
 	}
 
 	ret = hns_roce_bitmap_alloc(&srq_table->bitmap, &srq->srqn);
-	if (ret == -1) {
+	if (ret) {
 		dev_err(hr_dev->dev, "SRQ alloc.Failed to alloc index.\n");
 		return -ENOMEM;
 	}