netdev - [patch net-next] net: devlink: add RNLT lock assertion to devlink_compat_switch_id

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Message-Id: <20220825112923.1359194-1-jiri@resnulli.us>
Date:   Thu, 25 Aug 2022 13:29:23 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com
Subject: [patch net-next] net: devlink: add RNLT lock assertion to devlink_compat_switch_id_get()

From: Jiri Pirko <jiri@...dia.com>

Similar to devlink_compat_phys_port_name_get(), make sure that
devlink_compat_switch_id_get() is called with RTNL lock held. Comment
already says so, so put this in code as well.

Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
 net/core/devlink.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 6854f574e3ae..3b4dc64eaaae 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -12339,6 +12339,8 @@ int devlink_compat_switch_id_get(struct net_device *dev,
 	 * 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->switch_port)
 		return -EOPNOTSUPP;
-- 
2.37.1