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net: refactor bpf_sk_reuseport_detach()

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Refactor sk_user_data dereference using more generic function
__rcu_dereference_sk_user_data_with_flags(), which improve its
maintainability

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Hawkins Jiawei <yin31149@gmail.com>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Hawkins Jiawei 2022-08-05 15:48:36 +08:00 committed by Jakub Kicinski
parent 2a0133723f
commit cf8c1e9672
1 changed files with 3 additions and 6 deletions
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9
kernel/bpf/reuseport_array.c
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@ -21,14 +21,11 @@ static struct reuseport_array *reuseport_array(struct bpf_map *map)
/* The caller must hold the reuseport_lock */
void bpf_sk_reuseport_detach(struct sock *sk)
{
uintptr_t sk_user_data;
struct sock __rcu **socks;
write_lock_bh(&sk->sk_callback_lock);
sk_user_data = (uintptr_t)sk->sk_user_data;
if (sk_user_data & SK_USER_DATA_BPF) {
struct sock __rcu **socks;
socks = (void *)(sk_user_data & SK_USER_DATA_PTRMASK);
socks = __rcu_dereference_sk_user_data_with_flags(sk, SK_USER_DATA_BPF);
if (socks) {
WRITE_ONCE(sk->sk_user_data, NULL);
/*
* Do not move this NULL assignment outside of