Commit 1f821611 authored Jul 30, 2018 by Taehee Yoo Committed by Daniel Borkmann Jul 31, 2018

lwt_bpf: remove unnecessary rcu_read_lock in run_lwt_bpf



run_lwt_bpf is called by bpf_{input/output/xmit}.
These functions are already protected by rcu_read_lock.
because lwtunnel_{input/output/xmit} holds rcu_read_lock
and then calls bpf_{input/output/xmit}.
So that rcu_read_lock in the run_lwt_bpf is unnecessary.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

parent 486cdf21

net/core/lwt_bpf.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -50,10 +50,8 @@ static int run_lwt_bpf(struct sk_buff skb, struct bpf_lwt_prog lwt,
		* mixing with BH RCU lock doesn't work.
		*/
		preempt_disable();
		rcu_read_lock();
		bpf_compute_data_pointers(skb);
		ret = bpf_prog_run_save_cb(lwt->prog, skb);
		rcu_read_unlock();

		switch (ret) {
		case BPF_OK: