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rtnetlink: add guard for RTNL

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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@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg 2024-03-28 08:27:49 +01:00 committed by David S. Miller
parent 84c41dcaae
commit 464eb03c4a
1 changed files with 3 additions and 0 deletions
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3
include/linux/rtnetlink.h
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@ -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;