genetlink: use idr_alloc_cyclic for family->id assignment

When allocating the next family->id it makes more sense to use
idr_alloc_cyclic to avoid re-using a previously used family->id as much
as possible.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index f0ec068e1d02..cb69d35c8e6a 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -362,8 +362,8 @@ int genl_register_family(struct genl_family *family)
         } else
                 family->attrbuf = NULL;
 
-        family->id = idr_alloc(&genl_fam_idr, family,
-                               start, end + 1, GFP_KERNEL);
+        family->id = idr_alloc_cyclic(&genl_fam_idr, family,
+                                      start, end + 1, GFP_KERNEL);
         if (family->id < 0) {
                 err = family->id;
                 goto errout_free;