Re: [PATCH v3 net-next 07/11] net: prep switchdev drivers for concurrent SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS

[Ido Schimmel]

On Wed, Feb 10, 2021 at 11:14:41AM +0200, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@xxxxxxx>
> 
> Because the bridge will start offloading SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS
> while not serialized by any lock such as the br->lock spinlock, existing
> drivers that treat that attribute and cache the brport flags might no
> longer work correctly.

Can you explain the race? This notification is sent from sysfs/netlink
call path, both of which take rtnl.