mptcp: use WRITE_ONCE for the pernet *_max
This patch uses WRITE_ONCE() for all the pernet add_addr_signal_max, add_addr_accept_max, local_addr_max and subflows_max fields in struct pm_nl_pernet to avoid concurrency issues. Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Родитель
e6d6ca6e12
Коммит
72603d207d
|
@ -572,6 +572,7 @@ static int mptcp_pm_nl_append_new_local_addr(struct pm_nl_pernet *pernet,
|
|||
struct mptcp_pm_addr_entry *entry)
|
||||
{
|
||||
struct mptcp_pm_addr_entry *cur;
|
||||
unsigned int addr_max;
|
||||
int ret = -EINVAL;
|
||||
|
||||
spin_lock_bh(&pernet->lock);
|
||||
|
@ -614,10 +615,14 @@ find_next:
|
|||
if (entry->addr.id > pernet->next_id)
|
||||
pernet->next_id = entry->addr.id;
|
||||
|
||||
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)
|
||||
pernet->add_addr_signal_max++;
|
||||
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)
|
||||
pernet->local_addr_max++;
|
||||
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
|
||||
addr_max = pernet->add_addr_signal_max;
|
||||
WRITE_ONCE(pernet->add_addr_signal_max, addr_max + 1);
|
||||
}
|
||||
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) {
|
||||
addr_max = pernet->local_addr_max;
|
||||
WRITE_ONCE(pernet->local_addr_max, addr_max + 1);
|
||||
}
|
||||
|
||||
pernet->addrs++;
|
||||
list_add_tail_rcu(&entry->list, &pernet->local_addr_list);
|
||||
|
@ -912,6 +917,7 @@ static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info)
|
|||
struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
|
||||
struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
|
||||
struct mptcp_pm_addr_entry addr, *entry;
|
||||
unsigned int addr_max;
|
||||
int ret;
|
||||
|
||||
ret = mptcp_pm_parse_addr(attr, info, false, &addr);
|
||||
|
@ -925,10 +931,14 @@ static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info)
|
|||
spin_unlock_bh(&pernet->lock);
|
||||
return -EINVAL;
|
||||
}
|
||||
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)
|
||||
pernet->add_addr_signal_max--;
|
||||
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)
|
||||
pernet->local_addr_max--;
|
||||
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
|
||||
addr_max = pernet->add_addr_signal_max;
|
||||
WRITE_ONCE(pernet->add_addr_signal_max, addr_max - 1);
|
||||
}
|
||||
if (entry->addr.flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) {
|
||||
addr_max = pernet->local_addr_max;
|
||||
WRITE_ONCE(pernet->local_addr_max, addr_max - 1);
|
||||
}
|
||||
|
||||
pernet->addrs--;
|
||||
list_del_rcu(&entry->list);
|
||||
|
@ -956,9 +966,9 @@ static void __flush_addrs(struct net *net, struct list_head *list)
|
|||
|
||||
static void __reset_counters(struct pm_nl_pernet *pernet)
|
||||
{
|
||||
pernet->add_addr_signal_max = 0;
|
||||
pernet->add_addr_accept_max = 0;
|
||||
pernet->local_addr_max = 0;
|
||||
WRITE_ONCE(pernet->add_addr_signal_max, 0);
|
||||
WRITE_ONCE(pernet->add_addr_accept_max, 0);
|
||||
WRITE_ONCE(pernet->local_addr_max, 0);
|
||||
pernet->addrs = 0;
|
||||
}
|
||||
|
||||
|
|
Загрузка…
Ссылка в новой задаче