Revert "genetlink: fix family dump race"

This reverts commit bba2a9f0d381e510ba32f2f984e5ae1e705c90d1 which is
commit 58ad436fcf49810aa006016107f494c9ac9013db upstream, as there are
reported problems with it.

Cc: Johannes Berg <johannes.berg@intel.com>
Cc: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 409dd40566595440c31ad20e4b7b1691c9953504..874f8ffbe423607171ba88cfa2cb73edd689c708 100644 (file)
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -700,10 +700,6 @@ static int ctrl_dumpfamily(struct sk_buff *skb, struct netlink_callback *cb)
        struct net *net = sock_net(skb->sk);
        int chains_to_skip = cb->args[0];
        int fams_to_skip = cb->args[1];
-       bool need_locking = chains_to_skip || fams_to_skip;
-
-       if (need_locking)
-               genl_lock();
 
        for (i = chains_to_skip; i < GENL_FAM_TAB_SIZE; i++) {
                n = 0;
@@ -725,9 +721,6 @@ errout:
        cb->args[0] = i;
        cb->args[1] = n;
 
-       if (need_locking)
-               genl_unlock();
-
        return skb->len;
 }