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/1572952082-6681-9-git-send-email-liweihang@hisilicon.com
Signed-off-by: Yixian Liu <liuyixian@huawei.com>
Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: Weihang Li <liweihang@hisilicon.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/hns/hns_roce_alloc.c

@@ -55,7 +55,7 @@ int hns_roce_bitmap_alloc(struct hns_roce_bitmap *bitmap, unsigned long *obj)
 			bitmap->last = 0;
 		*obj |= bitmap->top;
 	} else {
-		ret = -1;
+		ret = -EINVAL;
 	}
 
 	spin_unlock(&bitmap->lock);
@@ -100,7 +100,7 @@ int hns_roce_bitmap_alloc_range(struct hns_roce_bitmap *bitmap, int cnt,
 		}
 		*obj |= bitmap->top;
 	} else {
-		ret = -1;
+		ret = -EINVAL;
 	}
 
 	spin_unlock(&bitmap->lock);

drivers/infiniband/hw/hns/hns_roce_cq.c

@@ -116,9 +116,9 @@ static int hns_roce_cq_alloc(struct hns_roce_dev *hr_dev, int nent,
 	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

@@ -83,7 +83,7 @@ static int hns_roce_buddy_alloc(struct hns_roce_buddy *buddy, int order,
 		}
 	}
 	spin_unlock(&buddy->lock);
-	return -1;
+	return -EINVAL;
 
  found:
 	clear_bit(*seg, buddy->bits[o]);
@@ -206,13 +206,14 @@ static int hns_roce_alloc_mtt_range(struct hns_roce_dev *hr_dev, int order,
 	}
 
 	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;
@@ -578,7 +579,7 @@ static int hns_roce_mr_alloc(struct hns_roce_dev *hr_dev, u32 pd, u64 iova,
 
 	/* 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

@@ -96,7 +96,7 @@ int hns_roce_uar_alloc(struct hns_roce_dev *hr_dev, struct hns_roce_uar *uar)
 
 	/* 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

@@ -111,7 +111,7 @@ static int hns_roce_srq_alloc(struct hns_roce_dev *hr_dev, u32 pdn, u32 cqn,
 	}
 
 	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;
 	}