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[NETFILTER]: Switch nf_register_afinfo/nf_unregister_afinfo to mutex

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The spinlock is only used in process context (register/unregister),
switch to a mutex.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-02-12 11:09:55 -08:00 committed by David S. Miller
parent e4ba13088d
commit d486dd1fb8
1 changed files with 10 additions and 5 deletions
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15
net/netfilter/core.c
View file

@ -22,29 +22,34 @@
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/proc_fs.h>
#include <linux/mutex.h>
#include <net/sock.h>
#include "nf_internals.h"
static DEFINE_SPINLOCK(afinfo_lock);
static DEFINE_MUTEX(afinfo_mutex);
struct nf_afinfo *nf_afinfo[NPROTO] __read_mostly;
EXPORT_SYMBOL(nf_afinfo);
int nf_register_afinfo(struct nf_afinfo *afinfo)
{
spin_lock(&afinfo_lock);
int err;
err = mutex_lock_interruptible(&afinfo_mutex);
if (err < 0)
return err;
rcu_assign_pointer(nf_afinfo[afinfo->family], afinfo);
spin_unlock(&afinfo_lock);
mutex_unlock(&afinfo_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(nf_register_afinfo);
void nf_unregister_afinfo(struct nf_afinfo *afinfo)
{
spin_lock(&afinfo_lock);
mutex_lock(&afinfo_mutex);
rcu_assign_pointer(nf_afinfo[afinfo->family], NULL);
spin_unlock(&afinfo_lock);
mutex_unlock(&afinfo_mutex);
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(nf_unregister_afinfo);