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authorVlad Buslov <vladbu@mellanox.com>2018-09-24 19:22:49 +0300
committerDavid S. Miller <davem@davemloft.net>2018-09-26 06:17:35 +0300
commit6f99528e9797794b91b43321fbbc93fe772b0803 (patch)
tree67accb6fd62e34b0720d0824d2cdc1076568890c /net
parentc774973e91e1f08c58bb25c950a30252cfde650c (diff)
downloadlinux-6f99528e9797794b91b43321fbbc93fe772b0803.tar.xz
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 'net')
-rw-r--r--net/core/rtnetlink.c6
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)
{