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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>
This commit is contained in:
Amir Vadai 2014-11-02 16:26:14 +02:00 committed by David S. Miller
parent 6e80669998
commit 0a98455666
1 changed files with 8 additions and 1 deletions
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9
drivers/net/ethernet/mellanox/mlx4/main.c
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@ -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;
}