diff options
| author | Geliang Tang <geliangtang@gmail.com> | 2021-02-01 15:09:06 -0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-02-02 18:37:18 -0800 |
| commit | 72603d207d595a1a70ba75ec885a5e02a6d802a8 (patch) | |
| tree | 8bf0c331d19082c1b5b6fcf184eb320ba3f2d90f /net/mptcp | |
| parent | e6d6ca6e12049dfbff6ac8b029678d2d2c55c34f (diff) | |
| download | linux-72603d207d595a1a70ba75ec885a5e02a6d802a8.tar.bz2 | |
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>
Diffstat (limited to 'net/mptcp')
| -rw-r--r-- | net/mptcp/pm_netlink.c | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index 83976b9ee99b..c429bd82313e 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -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; } |