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authornikolay@redhat.com <nikolay@redhat.com>2013-09-07 00:00:25 +0200
committerDavid S. Miller <davem@davemloft.net>2013-09-11 15:55:17 -0400
commit5c5038dc26bdc609022a897e15f9ccdd28402ad9 (patch)
treeacbde7eac54c53a2303c8d7dfab6fdc34f45e8ef /drivers/net/bonding
parent8112b1fe071be01a28a774ed55909e6f4b29712d (diff)
downloadop-kernel-dev-5c5038dc26bdc609022a897e15f9ccdd28402ad9.zip
op-kernel-dev-5c5038dc26bdc609022a897e15f9ccdd28402ad9.tar.gz
bonding: fix store_arp_validate race with mode change
We need to protect store_arp_validate via rtnl because it can race with mode changing and we can end up having arp_validate set in a mode different from active-backup. Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com> Acked-by: Veaceslav Falico <vfalico@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/bonding')
-rw-r--r--drivers/net/bonding/bond_sysfs.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index ce46776..4e386836 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -419,27 +419,33 @@ static ssize_t bonding_store_arp_validate(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
- int new_value;
+ int new_value, ret = count;
struct bonding *bond = to_bond(d);
+ if (!rtnl_trylock())
+ return restart_syscall();
new_value = bond_parse_parm(buf, arp_validate_tbl);
if (new_value < 0) {
pr_err("%s: Ignoring invalid arp_validate value %s\n",
bond->dev->name, buf);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
if (new_value && (bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
pr_err("%s: arp_validate only supported in active-backup mode.\n",
bond->dev->name);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
pr_info("%s: setting arp_validate to %s (%d).\n",
bond->dev->name, arp_validate_tbl[new_value].modename,
new_value);
bond->params.arp_validate = new_value;
+out:
+ rtnl_unlock();
- return count;
+ return ret;
}
static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate,
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