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[NETFILTER]: nfnetlink: use mutex instead of semaphore 

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-03-14 16:39:25 -07:00 committed by David S. Miller
parent c6a1e615d1
commit a3c5029cf7
3 changed files with 25 additions and 28 deletions
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13
include/linux/netfilter/nfnetlink.h
View File

@ -129,19 +129,6 @@ extern void __nfa_fill(struct sk_buff *skb, int attrtype,
({ if (skb_tailroom(skb) < (int)NFA_SPACE(attrlen)) goto nfattr_failure; \
__nfa_fill(skb, attrtype, attrlen, data); })
extern struct semaphore nfnl_sem;
#define nfnl_shlock() down(&nfnl_sem)
#define nfnl_shlock_nowait() down_trylock(&nfnl_sem)
#define nfnl_shunlock() do { up(&nfnl_sem); \
if(nfnl && nfnl->sk_receive_queue.qlen) \
nfnl->sk_data_ready(nfnl, 0); \
} while(0)
extern void nfnl_lock(void);
extern void nfnl_unlock(void);
extern int nfnetlink_subsys_register(struct nfnetlink_subsystem *n);
extern int nfnetlink_subsys_unregister(struct nfnetlink_subsystem *n);

5
include/net/netfilter/nf_conntrack_l3proto.h
View File

@ -90,10 +90,7 @@ extern struct nf_conntrack_l3proto *nf_ct_l3protos[AF_MAX];
/* Protocol registration. */
extern int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto);
extern void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto);
extern struct nf_conntrack_l3proto *
nf_ct_l3proto_find_get(u_int16_t l3proto);
extern struct nf_conntrack_l3proto *nf_ct_l3proto_find_get(u_int16_t l3proto);
extern void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p);
/* Existing built-in protocols */

35
net/netfilter/nfnetlink.c
View File

@ -28,6 +28,7 @@
#include <asm/uaccess.h>
#include <asm/system.h>
#include <net/sock.h>
#include <net/netlink.h>
#include <linux/init.h>
#include <linux/spinlock.h>
@ -51,16 +52,28 @@ static char __initdata nfversion[] = "0.30";
static struct sock *nfnl = NULL;
static struct nfnetlink_subsystem *subsys_table[NFNL_SUBSYS_COUNT];
DECLARE_MUTEX(nfnl_sem);
static DEFINE_MUTEX(nfnl_mutex);
void nfnl_lock(void)
static void nfnl_lock(void)
{
nfnl_shlock();
mutex_lock(&nfnl_mutex);
}
void nfnl_unlock(void)
static int nfnl_trylock(void)
{
nfnl_shunlock();
return !mutex_trylock(&nfnl_mutex);
}
static 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(struct nfnetlink_subsystem *n)
@ -248,11 +261,11 @@ static int nfnetlink_rcv_msg(struct sk_buff *skb,
ss = nfnetlink_get_subsys(type);
if (!ss) {
#ifdef CONFIG_KMOD
/* don't call nfnl_shunlock, since it would reenter
/* don't call nfnl_unlock, since it would reenter
* with further packet processing */
up(&nfnl_sem);
__nfnl_unlock();
request_module("nfnetlink-subsys-%d", NFNL_SUBSYS_ID(type));
nfnl_shlock();
nfnl_lock();
ss = nfnetlink_get_subsys(type);
if (!ss)
#endif
@ -322,7 +335,7 @@ static void nfnetlink_rcv(struct sock *sk, int len)
do {
struct sk_buff *skb;
if (nfnl_shlock_nowait())
if (nfnl_trylock())
return;
while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
@ -337,9 +350,9 @@ static void nfnetlink_rcv(struct sock *sk, int len)
kfree_skb(skb);
}
/* don't call nfnl_shunlock, since it would reenter
/* don't call nfnl_unlock, since it would reenter
* with further packet processing */
up(&nfnl_sem);
__nfnl_unlock();
} while(nfnl && nfnl->sk_receive_queue.qlen);
}