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authorStephen Hemminger <shemminger@vyatta.com>2009-02-26 06:55:31 +0000
committerDavid S. Miller <davem@davemloft.net>2009-03-03 00:47:47 -0800
commitb325fddb7f869e6c95a88dc6573220f162e5b89f (patch)
treeebbde90999700f15e2196edd76351519a2a484b2 /net/ipv6
parent5a5990d3090b03745a9548a6f5edef02095675cf (diff)
downloadlinux-b325fddb7f869e6c95a88dc6573220f162e5b89f.tar.bz2
ipv6: Fix sysctl unregistration deadlock
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/addrconf.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index f9afb452249c..40fabdee42ae 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -493,15 +493,17 @@ static void addrconf_forward_change(struct net *net, __s32 newf)
read_unlock(&dev_base_lock);
}
-static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
+static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
{
struct net *net;
net = (struct net *)table->extra2;
if (p == &net->ipv6.devconf_dflt->forwarding)
- return;
+ return 0;
+
+ if (!rtnl_trylock())
+ return -ERESTARTSYS;
- rtnl_lock();
if (p == &net->ipv6.devconf_all->forwarding) {
__s32 newf = net->ipv6.devconf_all->forwarding;
net->ipv6.devconf_dflt->forwarding = newf;
@@ -512,6 +514,7 @@ static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
if (*p)
rt6_purge_dflt_routers(net);
+ return 1;
}
#endif
@@ -3983,7 +3986,7 @@ int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
if (write)
- addrconf_fixup_forwarding(ctl, valp, val);
+ ret = addrconf_fixup_forwarding(ctl, valp, val);
return ret;
}
@@ -4019,8 +4022,7 @@ static int addrconf_sysctl_forward_strategy(ctl_table *table,
}
*valp = new;
- addrconf_fixup_forwarding(table, valp, val);
- return 1;
+ return addrconf_fixup_forwarding(table, valp, val);
}
static struct addrconf_sysctl_table