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ipv4: remove flush_mutex from ipv4_sysctl_rtcache_flush

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It is possible to avoid locking at all in ipv4_sysctl_rtcache_flush by
defining local ctl_table on the stack.

The patch is based on the suggestion from Eric W. Biederman.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis V. Lunev 2008-07-08 03:05:28 -07:00 • committed by David S. Miller
parent 2c693610fe
commit 81c684d12d
1 changed files with 6 additions and 8 deletions
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14
net/ipv4/route.c
View file

@ -2873,22 +2873,20 @@ void ip_rt_multicast_event(struct in_device *in_dev)
}
#ifdef CONFIG_SYSCTL
static int ipv4_sysctl_rtcache_flush(ctl_table *ctl, int write,
static int ipv4_sysctl_rtcache_flush(ctl_table *__ctl, int write,
struct file *filp, void __user *buffer,
size_t *lenp, loff_t *ppos)
{
if (write) {
int flush_delay;
ctl_table ctl;
struct net *net;
static DEFINE_MUTEX(flush_mutex);
mutex_lock(&flush_mutex);
ctl->data = &flush_delay;
proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
ctl->data = NULL;
mutex_unlock(&flush_mutex);
memcpy(&ctl, __ctl, sizeof(ctl));
ctl.data = &flush_delay;
proc_dointvec(&ctl, write, filp, buffer, lenp, ppos);
net = (struct net *)ctl->extra1;
net = (struct net *)__ctl->extra1;
rt_cache_flush(net, flush_delay);
return 0;
}