[PATCH net-next 06/13] net/mlx5: LAG, size debugfs buffers by port count

[Tariq Toukan <tariqt@nvidia.com>]

From: Shay Drory <shayd@nvidia.com>

debugfs mapping_show() uses constant MLX5_MAX_PORTS to size ports array.
Instead, allocate dynamically using actual number of ports.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Akiva Goldberger <agoldberger@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/lag/debugfs.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/debugfs.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/debugfs.c
index e9b8d79d2d21..44296789d656 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/debugfs.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/debugfs.c
@@ -101,14 +101,18 @@ static int flags_show(struct seq_file *file, void *priv)
 static int mapping_show(struct seq_file *file, void *priv)
 {
 	struct mlx5_core_dev *dev = file->private;
-	u8 ports[MLX5_MAX_PORTS] = {};
 	struct mlx5_lag *ldev;
 	bool hash = false;
 	bool lag_active;
 	int i, idx = 0;
 	int num_ports;
+	u8 *ports;
 
 	ldev = mlx5_lag_dev(dev);
+	ports = kcalloc(ldev->ports, sizeof(*ports), GFP_KERNEL);
+	if (!ports)
+		return -ENOMEM;
+
 	mutex_lock(&ldev->lock);
 	lag_active = __mlx5_lag_is_active(ldev);
 	if (lag_active) {
@@ -123,8 +127,10 @@ static int mapping_show(struct seq_file *file, void *priv)
 		}
 	}
 	mutex_unlock(&ldev->lock);
-	if (!lag_active)
+	if (!lag_active) {
+		kfree(ports);
 		return -EINVAL;
+	}
 
 	for (i = 0; i < num_ports; i++) {
 		if (hash)
@@ -133,6 +139,7 @@ static int mapping_show(struct seq_file *file, void *priv)
 			seq_printf(file, "%d:%d\n", i + 1, ports[i]);
 	}
 
+	kfree(ports);
 	return 0;
 }
 
-- 
2.44.0