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| author |   Vlad Buslov <vladbu@mellanox.com> | 2018-09-24 19:22:49 +0300 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-09-25 20:17:35 -0700 |
| commit | 6f99528e9797794b91b43321fbbc93fe772b0803 (patch) | |
| tree | 67accb6fd62e34b0720d0824d2cdc1076568890c /net/core/rtnetlink.c | |
| parent | tls: Fixed a memory leak during socket close (diff) | |
| download | linux-dev-6f99528e9797794b91b43321fbbc93fe772b0803.tar.xz linux-dev-6f99528e9797794b91b43321fbbc93fe772b0803.zip | |
net: core: netlink: add helper refcount dec and lock function
Rtnl lock is encapsulated in netlink and cannot be accessed by other
modules directly. This means that reference counted objects that rely on
rtnl lock cannot use it with refcounter helper function that atomically
releases decrements reference and obtains mutex.
This patch implements simple wrapper function around refcount_dec_and_lock
that obtains rtnl lock if reference counter value reached 0.
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
| -rw-r--r-- | net/core/rtnetlink.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 80a7e18c65fb..35162e1b06ad 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -130,6 +130,12 @@ int rtnl_is_locked(void) } EXPORT_SYMBOL(rtnl_is_locked); +bool refcount_dec_and_rtnl_lock(refcount_t *r) +{ + return refcount_dec_and_mutex_lock(r, &rtnl_mutex); +} +EXPORT_SYMBOL(refcount_dec_and_rtnl_lock); + #ifdef CONFIG_PROVE_LOCKING bool lockdep_rtnl_is_held(void) { |