netdev - [PATCH 1/3] rtnetlink: add guard for RTNL

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Message-ID: <20240325233905.94899774f596.I9da87266ad39fff647828b5822e6ac8898857b71@changeid>
Date: Mon, 25 Mar 2024 23:31:26 +0100
From: Johannes Berg <johannes@...solutions.net>
To: netdev@...r.kernel.org
Cc: Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 1/3] rtnetlink: add guard for RTNL

From: Johannes Berg <johannes.berg@...el.com>

The new guard/scoped_gard can be useful for the RTNL as well,
so add a guard definition for it. It gets used like

 {
   guard(rtnl)();
   // RTNL held until end of block
 }

or

  scoped_guard(rtnl) {
    // RTNL held in this block
  }

as with any other guard/scoped_guard.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
---
 include/linux/rtnetlink.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index cdfc897f1e3c..a7da7dfc06a2 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -7,6 +7,7 @@
 #include <linux/netdevice.h>
 #include <linux/wait.h>
 #include <linux/refcount.h>
+#include <linux/cleanup.h>
 #include <uapi/linux/rtnetlink.h>
 
 extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo);
@@ -46,6 +47,8 @@ extern int rtnl_is_locked(void);
 extern int rtnl_lock_killable(void);
 extern bool refcount_dec_and_rtnl_lock(refcount_t *r);
 
+DEFINE_LOCK_GUARD_0(rtnl, rtnl_lock(), rtnl_unlock())
+
 extern wait_queue_head_t netdev_unregistering_wq;
 extern atomic_t dev_unreg_count;
 extern struct rw_semaphore pernet_ops_rwsem;
-- 
2.44.0