Commit 3b71535f authored by Denis V. Lunev's avatar Denis V. Lunev Committed by David S. Miller
Browse files

[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like outdated copy/paste from rtnetlink.c. Push them into sync with the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: default avatarDenis V. Lunev <den@openvz.org>
Acked-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1536cc0d

net/netfilter/nfnetlink.c

+5 −20
Original line number Diff line number Diff line
@@ -44,28 +44,16 @@ 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)

static inline void nfnl_unlock(void)

{

	mutex_unlock(&nfnl_mutex);

}



static 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)

{

	nfnl_lock();
@@ -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);

}

net/netlink/genetlink.c

+3 −12
Original line number Diff line number Diff line
@@ -22,22 +22,14 @@ struct sock *genl_sock = NULL; 


static DEFINE_MUTEX(genl_mutex); /* serialization of message processing */



static void genl_lock(void)

static inline void genl_lock(void)

{

	mutex_lock(&genl_mutex);

}



static int genl_trylock(void)

{

	return !mutex_trylock(&genl_mutex);

}



static void genl_unlock(void)

static inline void genl_unlock(void)

{

	mutex_unlock(&genl_mutex);



	if (genl_sock && genl_sock->sk_receive_queue.qlen)

		genl_sock->sk_data_ready(genl_sock, 0);

}



#define GENL_FAM_TAB_SIZE	16
@@ -483,8 +475,7 @@ static void genl_rcv(struct sock *sk, int len) 
	unsigned int qlen = 0;



	do {

		if (genl_trylock())

			return;

		genl_lock();

		qlen = netlink_run_queue(sk, qlen, genl_rcv_msg);

		genl_unlock();

	} while (qlen && genl_sock && genl_sock->sk_receive_queue.qlen);

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