From: Vlad Buslov Date: Mon, 12 Aug 2019 17:02:02 +0000 (+0300) Subject: net: devlink: remove redundant rtnl lock assert X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=043b8413e8c0c0ffbf8be268eb73716e05a96064;p=linux.git net: devlink: remove redundant rtnl lock assert It is enough for caller of devlink_compat_switch_id_get() to hold the net device to guarantee that devlink port is not destroyed concurrently. Remove rtnl lock assertion and modify comment to warn user that they must hold either rtnl lock or reference to net device. This is necessary to accommodate future implementation of rtnl-unlocked TC offloads driver callbacks. Signed-off-by: Vlad Buslov Acked-by: Jiri Pirko Signed-off-by: Jakub Kicinski --- diff --git a/net/core/devlink.c b/net/core/devlink.c index e3a1ae44f93d1..d3dbb904bf3b1 100644 --- a/net/core/devlink.c +++ b/net/core/devlink.c @@ -6939,11 +6939,10 @@ int devlink_compat_switch_id_get(struct net_device *dev, { struct devlink_port *devlink_port; - /* RTNL mutex is held here which ensures that devlink_port - * instance cannot disappear in the middle. No need to take + /* Caller must hold RTNL mutex or reference to dev, which ensures that + * devlink_port instance cannot disappear in the middle. No need to take * any devlink lock as only permanent values are accessed. */ - ASSERT_RTNL(); devlink_port = netdev_to_devlink_port(dev); if (!devlink_port || !devlink_port->attrs.switch_port) return -EOPNOTSUPP;