From: Kaike Wan <kaike.wan@xxxxxxxxx>
This patch adds a function to check if listeners for a netlink multicast
group are present.
Signed-off-by: Kaike Wan <kaike.wan@xxxxxxxxx>
Signed-off-by: John Fleck <john.fleck@xxxxxxxxx>
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
Reviewed-by: Sean Hefty <sean.hefty@xxxxxxxxx>
---
drivers/infiniband/core/netlink.c | 8 ++++++++
include/rdma/rdma_netlink.h | 7 +++++++
2 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/drivers/infiniband/core/netlink.c b/drivers/infiniband/core/netlink.c
index 23dd5a5..e0fc913 100644
--- a/drivers/infiniband/core/netlink.c
+++ b/drivers/infiniband/core/netlink.c
@@ -49,6 +49,14 @@ static DEFINE_MUTEX(ibnl_mutex);
static struct sock *nls;
static LIST_HEAD(client_list);
+int ibnl_chk_listeners(unsigned int group)
+{
+ if (netlink_has_listeners(nls, group) == 0)
+ return -1;
+ return 0;
+}
+EXPORT_SYMBOL(ibnl_chk_listeners);
+
int ibnl_add_client(int index, int nops,
const struct ibnl_client_cbs cb_table[])
{
diff --git a/include/rdma/rdma_netlink.h b/include/rdma/rdma_netlink.h
index 0790882..5852661 100644
--- a/include/rdma/rdma_netlink.h
+++ b/include/rdma/rdma_netlink.h
@@ -77,4 +77,11 @@ int ibnl_unicast(struct sk_buff *skb, struct nlmsghdr *nlh,
int ibnl_multicast(struct sk_buff *skb, struct nlmsghdr *nlh,
unsigned int group, gfp_t flags);
+/**
+ * Check if there are any listeners to the netlink group
+ * @group: the netlink group ID
+ * Returns 0 on success or a negative for no listeners.
+ */
+int ibnl_chk_listeners(unsigned int group);
+
#endif /* _RDMA_NETLINK_H */
--
1.7.1
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