[NET]: Make netlink processing routines semi-synchronious (inspired by rtnl) v2

The code in netfilter/nfnetlink.c and in ./net/netlink/genetlink.c looks
like outdated copy/paste from rtnetlink.c. Push them into sync with the
original.

Changes from v1:
- deleted comment in nfnetlink_rcv_msg by request of Patrick McHardy

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 20 deletions

diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index cb41990f92e..99775af19ff 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -44,26 +44,14 @@ static struct sock *nfnl = NULL;
 static const struct nfnetlink_subsystem *subsys_table[NFNL_SUBSYS_COUNT];
 static DEFINE_MUTEX(nfnl_mutex);
 
-static void nfnl_lock(void)
+static inline void nfnl_lock(void)
 {
         mutex_lock(&nfnl_mutex);
 }
 
-static int nfnl_trylock(void)
-{
-        return !mutex_trylock(&nfnl_mutex);
-}
-
-static void __nfnl_unlock(void)
-{
-        mutex_unlock(&nfnl_mutex);
-}
-
-static void nfnl_unlock(void)
+static inline void nfnl_unlock(void)
 {
         mutex_unlock(&nfnl_mutex);
-        if (nfnl->sk_receive_queue.qlen)
-                nfnl->sk_data_ready(nfnl, 0);
 }
 
 int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n)
@@ -147,9 +135,7 @@ static int nfnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
         ss = nfnetlink_get_subsys(type);
         if (!ss) {
 #ifdef CONFIG_KMOD
-                /* don't call nfnl_unlock, since it would reenter
-                 * with further packet processing */
-                __nfnl_unlock();
+                nfnl_unlock();
                 request_module("nfnetlink-subsys-%d", NFNL_SUBSYS_ID(type));
                 nfnl_lock();
                 ss = nfnetlink_get_subsys(type);
@@ -188,10 +174,9 @@ static void nfnetlink_rcv(struct sock *sk, int len)
         unsigned int qlen = 0;
 
         do {
-                if (nfnl_trylock())
-                        return;
+                nfnl_lock();
                 qlen = netlink_run_queue(sk, qlen, nfnetlink_rcv_msg);
-                __nfnl_unlock();
+                nfnl_unlock();
         } while (qlen);
 }