diff options
| author | Amir Vadai <amirv@mellanox.com> | 2014-11-02 16:26:14 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-11-03 12:28:13 -0500 |
| commit | 0a98455666ec87378148a1dde97f1ce5baf75a64 (patch) | |
| tree | bfba09b40f2718ed459973f8673efe5acb3f9d8a | |
| parent | 6e8066999800d90d52af5c84ac49ebf683d14cdc (diff) | |
| download | openvswitch-0a98455666ec87378148a1dde97f1ce5baf75a64.tar.gz | |
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 <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/main.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c index 90de6e1ad06e9e..9f821964a1b9e0 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; } |