From 0a98455666ec87378148a1dde97f1ce5baf75a64 Mon Sep 17 00:00:00 2001 From: Amir Vadai Date: Sun, 2 Nov 2014 16:26:14 +0200 Subject: [PATCH] net/mlx4_core: Protect port type setting by mutex We need to protect set_port_type() for concurrency, as the sysfs code could call it from mutliple contexts in parallel. The port_mutex is not enough because we need to protect from concurrent modification of 'info' and stopping of the port sensing work. Signed-off-by: Amir Vadai Signed-off-by: David S. Miller --- drivers/net/ethernet/mellanox/mlx4/main.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c index 90de6e1ad06e..9f821964a1b9 100644 --- a/drivers/net/ethernet/mellanox/mlx4/main.c +++ b/drivers/net/ethernet/mellanox/mlx4/main.c @@ -901,9 +901,12 @@ static ssize_t set_port_type(struct device *dev, struct mlx4_priv *priv = mlx4_priv(mdev); enum mlx4_port_type types[MLX4_MAX_PORTS]; enum mlx4_port_type new_types[MLX4_MAX_PORTS]; + static DEFINE_MUTEX(set_port_type_mutex); int i; int err = 0; + mutex_lock(&set_port_type_mutex); + if (!strcmp(buf, "ib\n")) info->tmp_type = MLX4_PORT_TYPE_IB; else if (!strcmp(buf, "eth\n")) @@ -912,7 +915,8 @@ static ssize_t set_port_type(struct device *dev, info->tmp_type = MLX4_PORT_TYPE_AUTO; else { mlx4_err(mdev, "%s is not supported port type\n", buf); - return -EINVAL; + err = -EINVAL; + goto err_out; } mlx4_stop_sense(mdev); @@ -958,6 +962,9 @@ static ssize_t set_port_type(struct device *dev, out: mlx4_start_sense(mdev); mutex_unlock(&priv->port_mutex); +err_out: + mutex_unlock(&set_port_type_mutex); + return err ? err : count; } -- 2.20.1