[PATCH v8 net-next 2/6] net/mlx5e: heap-allocate devlink param values

[Ratheesh Kannoth <rkannoth@marvell.com>]

union devlink_param_value grows when U64 array params
are added to devlink. Keeping a four-element array of that
union on the stack in mlx5e_pcie_cong_get_thresh_config()
then trips -Wframe-larger-than=1280. Allocate the temporary
values with kcalloc() and free them on success and
error paths.

Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>
---
 .../ethernet/mellanox/mlx5/core/en/pcie_cong_event.c  | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/pcie_cong_event.c b/drivers/net/ethernet/mellanox/mlx5/core/en/pcie_cong_event.c
index 2eb666a46f39..f02995552129 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/pcie_cong_event.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/pcie_cong_event.c
@@ -259,15 +259,21 @@ mlx5e_pcie_cong_get_thresh_config(struct mlx5_core_dev *dev,
 		MLX5_DEVLINK_PARAM_ID_PCIE_CONG_OUT_HIGH,
 	};
 	struct devlink *devlink = priv_to_devlink(dev);
-	union devlink_param_value val[4];
+	union devlink_param_value *val;
+
+	val = kcalloc(4, sizeof(*val), GFP_KERNEL);
+	if (!val)
+		return -ENOMEM;
 
 	for (int i = 0; i < 4; i++) {
 		u32 id = ids[i];
 		int err;
 
 		err = devl_param_driverinit_value_get(devlink, id, &val[i]);
-		if (err)
+		if (err) {
+			kfree(val);
 			return err;
+		}
 	}
 
 	config->inbound_low = val[0].vu16;
@@ -275,6 +281,7 @@ mlx5e_pcie_cong_get_thresh_config(struct mlx5_core_dev *dev,
 	config->outbound_low = val[2].vu16;
 	config->outbound_high = val[3].vu16;
 
+	kfree(val);
 	return 0;
 }
 
-- 
2.43.0