[net 04/11] net/mlx5: Fix mlx5_get_uars_page to return error code

[Saeed Mahameed]

From: Eran Ben Elisha <era...@mellanox.com>

Change mlx5_get_uars_page to return ERR_PTR in case of
allocation failure. Change all callers accordingly to
check the IS_ERR(ptr) instead of NULL.

Fixes: 59211bd3b632 ("net/mlx5: Split the load/unload flow into hardware and 
software flows")
Signed-off-by: Eran Ben Elisha <era...@mellanox.com>
Signed-off-by: Eugenia Emantayev <euge...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
---
 drivers/infiniband/hw/mlx5/main.c              |  2 +-
 drivers/net/ethernet/mellanox/mlx5/core/main.c |  3 ++-
 drivers/net/ethernet/mellanox/mlx5/core/uar.c  | 14 ++++++--------
 3 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/main.c 
b/drivers/infiniband/hw/mlx5/main.c
index 00cb184fa027..262c1aa2e028 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -4160,7 +4160,7 @@ static void *mlx5_ib_add(struct mlx5_core_dev *mdev)
                goto err_cnt;
 
        dev->mdev->priv.uar = mlx5_get_uars_page(dev->mdev);
-       if (!dev->mdev->priv.uar)
+       if (IS_ERR(dev->mdev->priv.uar))
                goto err_cong;
 
        err = mlx5_alloc_bfreg(dev->mdev, &dev->bfreg, false, false);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c 
b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index a4c82fa71aec..6dffa58fb178 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -1135,8 +1135,9 @@ static int mlx5_load_one(struct mlx5_core_dev *dev, 
struct mlx5_priv *priv,
        }
 
        dev->priv.uar = mlx5_get_uars_page(dev);
-       if (!dev->priv.uar) {
+       if (IS_ERR(dev->priv.uar)) {
                dev_err(&pdev->dev, "Failed allocating uar, aborting\n");
+               err = PTR_ERR(dev->priv.uar);
                goto err_disable_msix;
        }
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/uar.c 
b/drivers/net/ethernet/mellanox/mlx5/core/uar.c
index 222b25908d01..8b97066dd1f1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/uar.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/uar.c
@@ -168,18 +168,16 @@ struct mlx5_uars_page *mlx5_get_uars_page(struct 
mlx5_core_dev *mdev)
        struct mlx5_uars_page *ret;
 
        mutex_lock(&mdev->priv.bfregs.reg_head.lock);
-       if (list_empty(&mdev->priv.bfregs.reg_head.list)) {
-               ret = alloc_uars_page(mdev, false);
-               if (IS_ERR(ret)) {
-                       ret = NULL;
-                       goto out;
-               }
-               list_add(&ret->list, &mdev->priv.bfregs.reg_head.list);
-       } else {
+       if (!list_empty(&mdev->priv.bfregs.reg_head.list)) {
                ret = list_first_entry(&mdev->priv.bfregs.reg_head.list,
                                       struct mlx5_uars_page, list);
                kref_get(&ret->ref_count);
+               goto out;
        }
+       ret = alloc_uars_page(mdev, false);
+       if (IS_ERR(ret))
+               goto out;
+       list_add(&ret->list, &mdev->priv.bfregs.reg_head.list);
 out:
        mutex_unlock(&mdev->priv.bfregs.reg_head.lock);
 
-- 
2.13.0