From 771acac2ffa5957b91e881908cd4c9657978a209 Mon Sep 17 00:00:00 2001
From: Jiri Pirko <jiri@mellanox.com>
Date: Wed, 14 Oct 2015 19:40:55 +0200
Subject: [PATCH] switchdev: assert rtnl mutex when going over lower netdevs
netdev_for_each_lower_dev has to be called with rtnl mutex held. So
better enforce it in switchdev functions.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/switchdev/switchdev.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index eac68c4e57ec9..73e3895175cf7 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -520,6 +520,8 @@ EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
* @id: object ID
* @obj: object to dump
* @cb: function to call with a filled object
+ *
+ * rtnl_lock must be held.
*/
int switchdev_port_obj_dump(struct net_device *dev, struct switchdev_obj *obj,
switchdev_obj_dump_cb_t *cb)
@@ -529,6 +531,8 @@ int switchdev_port_obj_dump(struct net_device *dev, struct switchdev_obj *obj,
struct list_head *iter;
int err = -EOPNOTSUPP;
+ ASSERT_RTNL();
+
if (ops && ops->switchdev_port_obj_dump)
return ops->switchdev_port_obj_dump(dev, obj, cb);
@@ -1097,6 +1101,8 @@ static struct net_device *switchdev_get_dev_by_nhs(struct fib_info *fi)
struct net_device *dev = NULL;
int nhsel;
+ ASSERT_RTNL();
+
/* For this route, all nexthop devs must be on the same switch. */
for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
@@ -1327,10 +1333,11 @@ void switchdev_port_fwd_mark_set(struct net_device *dev,
u32 mark = dev->ifindex;
u32 reset_mark = 0;
- if (group_dev && joining) {
- mark = switchdev_port_fwd_mark_get(dev, group_dev);
- } else if (group_dev && !joining) {
- if (dev->offload_fwd_mark == mark)
+ if (group_dev) {
+ ASSERT_RTNL();
+ if (joining)
+ mark = switchdev_port_fwd_mark_get(dev, group_dev);
+ else if (dev->offload_fwd_mark == mark)
/* Ohoh, this port was the mark reference port,
* but it's leaving the group, so reset the
* mark for the remaining ports in the group.
--
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