[NETLINK]: Switch cb_lock spinlock to mutex and allow to override it

Switch cb_lock to mutex and allow netlink kernel users to override it
with a subsystem specific mutex for consistent locking in dump callbacks.
All netlink_dump_start users have been audited not to rely on any
side-effects of the previously used spinlock.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 2ff968373f1c..88659edc9b1a 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2444,7 +2444,7 @@ static int __init xfrm_user_init(void)
         printk(KERN_INFO "Initializing XFRM netlink socket\n");
 
         nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
-                                     xfrm_netlink_rcv, THIS_MODULE);
+                                     xfrm_netlink_rcv, NULL, THIS_MODULE);
         if (nlsk == NULL)
                 return -ENOMEM;
         rcu_assign_pointer(xfrm_nl, nlsk);