From: Gal Pressman <galp@mellanox.com>
Date: Mon, 4 Dec 2017 09:57:43 +0200
Subject: net/mlx5e: Prevent possible races in VXLAN control flow
Patch-mainline: v4.15-rc5
Git-commit: 0c1cc8b2215f5122ca614b5adca60346018758c3
References: bsc#1046303 FATE#322944

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 <galp@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/vxlan.c |    4 ++++
 1 file changed, 4 insertions(+)

--- 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
 	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 @@ err_free:
 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
 	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 @@ out_unlock:
 		mlx5e_vxlan_core_del_port_cmd(priv->mdev, port);
 		kfree(vxlan);
 	}
+	mutex_unlock(&priv->state_lock);
 	kfree(vxlan_work);
 }