From: Gal Pressman <[email protected]>
When calling add/remove VXLAN port, a lock must be held in order to
prevent race scenarios when more than one add/remove happens at the
same time.
Fix by holding our state_lock (mutex) as done by all other parts of the
driver.
Note that the spinlock protecting the radix-tree is still needed in
order to synchronize radix-tree access from softirq context.
Fixes: b3f63c3d5e2c ("net/mlx5e: Add netdev support for VXLAN tunneling")
Signed-off-by: Gal Pressman <[email protected]>
Signed-off-by: Saeed Mahameed <[email protected]>
---
drivers/net/ethernet/mellanox/mlx5/core/vxlan.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/vxlan.c
b/drivers/net/ethernet/mellanox/mlx5/core/vxlan.c
index 25f782344667..2f74953e4561 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/vxlan.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/vxlan.c
@@ -88,6 +88,7 @@ static void mlx5e_vxlan_add_port(struct work_struct *work)
struct mlx5e_vxlan *vxlan;
int err;
+ mutex_lock(&priv->state_lock);
vxlan = mlx5e_vxlan_lookup_port(priv, port);
if (vxlan) {
atomic_inc(&vxlan->refcount);
@@ -117,6 +118,7 @@ static void mlx5e_vxlan_add_port(struct work_struct *work)
err_delete_port:
mlx5e_vxlan_core_del_port_cmd(priv->mdev, port);
free_work:
+ mutex_unlock(&priv->state_lock);
kfree(vxlan_work);
}
@@ -130,6 +132,7 @@ static void mlx5e_vxlan_del_port(struct work_struct *work)
struct mlx5e_vxlan *vxlan;
bool remove = false;
+ mutex_lock(&priv->state_lock);
spin_lock_bh(&vxlan_db->lock);
vxlan = radix_tree_lookup(&vxlan_db->tree, port);
if (!vxlan)
@@ -147,6 +150,7 @@ static void mlx5e_vxlan_del_port(struct work_struct *work)
mlx5e_vxlan_core_del_port_cmd(priv->mdev, port);
kfree(vxlan);
}
+ mutex_unlock(&priv->state_lock);
kfree(vxlan_work);
}
--
2.13.0
