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From: Cong Wang <xiyou.wangcong@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Linux Kernel Network Developers <netdev@vger.kernel.org>,
	bpf <bpf@vger.kernel.org>, Cong Wang <cong.wang@bytedance.com>,
	John Fastabend <john.fastabend@gmail.com>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Jakub Sitnicki <jakub@cloudflare.com>,
	Lorenz Bauer <lmb@cloudflare.com>
Subject: Re: [PATCH bpf-next v5 07/11] af_unix: implement unix_dgram_bpf_recvmsg()
Date: Mon, 19 Jul 2021 17:03:15 -0700	[thread overview]
Message-ID: <CAM_iQpVEHF2h58YJA7xdWifSG0dtErhkoe4rjceTR7w_1SMspA@mail.gmail.com> (raw)
In-Reply-To: <a76f89b3-0911-e1f1-d1c1-707b9bc5478a@gmail.com>

On Sun, Jul 18, 2021 at 10:49 AM Eric Dumazet <eric.dumazet@gmail.com> wrote:
>
>
>
> On 7/4/21 9:02 PM, Cong Wang wrote:
> > From: Cong Wang <cong.wang@bytedance.com>
> > +     mutex_lock(&u->iolock);
>
> u->iolock mutex is owned here.
>
> > +     if (!skb_queue_empty(&sk->sk_receive_queue) &&
> > +         sk_psock_queue_empty(psock)) {
> > +             ret = __unix_dgram_recvmsg(sk, msg, len, flags);
>
> But __unix_dgram_recvmsg() will also try to grab this mutex ?

Good catch. I should release the lock before calling it. I will send
a patch.

Thanks.

  reply	other threads:[~2021-07-20  0:43 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-04 19:02 [PATCH bpf-next v5 00/11] sockmap: add sockmap support for unix datagram socket Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 01/11] sock_map: relax config dependency to CONFIG_NET Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 02/11] sock_map: lift socket state restriction for datagram sockets Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 03/11] af_unix: implement ->read_sock() for sockmap Cong Wang
2021-07-12 17:04   ` John Fastabend
2021-07-04 19:02 ` [PATCH bpf-next v5 04/11] af_unix: set TCP_ESTABLISHED for datagram sockets too Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 05/11] af_unix: add a dummy ->close() for sockmap Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 06/11] af_unix: implement ->psock_update_sk_prot() Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 07/11] af_unix: implement unix_dgram_bpf_recvmsg() Cong Wang
2021-07-18 17:49   ` Eric Dumazet
2021-07-20  0:03     ` Cong Wang [this message]
2021-07-04 19:02 ` [PATCH bpf-next v5 08/11] selftests/bpf: factor out udp_socketpair() Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 09/11] selftests/bpf: factor out add_to_sockmap() Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 10/11] selftests/bpf: add a test case for unix sockmap Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 11/11] selftests/bpf: add test cases for redirection between udp and unix Cong Wang
2021-08-05 22:43   ` Andrii Nakryiko
2021-08-06  2:34     ` Cong Wang
2021-07-12 17:02 ` [PATCH bpf-next v5 00/11] sockmap: add sockmap support for unix datagram socket John Fastabend
2021-07-16  1:31   ` Alexei Starovoitov

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