net/mlx5: Do not hold mutex while reading table constants

Table max_size, min and max rate are constants initialized while table
is created. Reading it doesn't need to hold a table mutex. Hence, read
them without holding table mutex.

Signed-off-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/rl.c b/drivers/net/ethernet/mellanox/mlx5/core/rl.c
index 99039c4..2accc0f 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/rl.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/rl.c
@@ -180,16 +180,18 @@ int mlx5_rl_add_rate_raw(struct mlx5_core_dev *dev, void *rl_in, u16 uid,
        int err = 0;
        u32 rate;
 
-       rate = MLX5_GET(set_pp_rate_limit_context, rl_in, rate_limit);
-       mutex_lock(&table->rl_lock);
+       if (!table->max_size)
+               return -EOPNOTSUPP;
 
+       rate = MLX5_GET(set_pp_rate_limit_context, rl_in, rate_limit);
        if (!rate || !mlx5_rl_is_in_range(dev, rate)) {
                mlx5_core_err(dev, "Invalid rate: %u, should be %u to %u\n",
                              rate, table->min_rate, table->max_rate);
-               err = -EINVAL;
-               goto out;
+               return -EINVAL;
        }
 
+       mutex_lock(&table->rl_lock);
+
        entry = find_rl_entry(table, rl_in, uid, dedicated_entry);
        if (!entry) {
                mlx5_core_err(dev, "Max number of %u rates reached\n",