From: Kaike Wan <kaike....@intel.com> This patch adds a function to check if listeners for a netlink multicast group are present.
Signed-off-by: Kaike Wan <kaike....@intel.com> Signed-off-by: John Fleck <john.fl...@intel.com> Signed-off-by: Ira Weiny <ira.we...@intel.com> Reviewed-by: Sean Hefty <sean.he...@intel.com> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html