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ipv6: addrconf_disable_ipv6() optimization

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Writing over /proc/sys/net/ipv6/conf/default/disable_ipv6
does not need to hold RTNL.

v3: remove a wrong change (Jakub Kicinski feedback)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2024-02-28 13:54:27 +00:00 committed by David S. Miller
parent d289ab65b8
commit 553ced03b2
1 changed files with 6 additions and 7 deletions
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13
net/ipv6/addrconf.c
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@ -6399,21 +6399,20 @@ static void addrconf_disable_change(struct net *net, __s32 newf)
static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
{
struct net *net;
struct net *net = (struct net *)table->extra2;
int old;
if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
WRITE_ONCE(*p, newf);
return 0;
}
if (!rtnl_trylock())
return restart_syscall();
net = (struct net *)table->extra2;
old = *p;
WRITE_ONCE(*p, newf);
if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
rtnl_unlock();
return 0;
}
if (p == &net->ipv6.devconf_all->disable_ipv6) {
WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);
addrconf_disable_change(net, newf);