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Date: Thu, 25 Sep 2008 14:14:47 -0500 From: Corey Minyard <minyard@....org> To: Jarek Poplawski <jarkao2@...il.com> Cc: Linux Kernel <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org Subject: Re: [PATCH 1/1] Use RCU for the UDP hash lock Jarek Poplawski wrote: > > ... > >> @@ -1094,7 +1103,7 @@ static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb, >> struct sock *sk; >> int dif; >> >> - read_lock(&udp_hash_lock); >> + rcu_read_lock(); >> sk = sk_head(&udptable[udp_hashfn(net, ntohs(uh->dest))]); >> > > Probably sk_head_rcu() is needed too. > Yes, it is. > >> dif = skb->dev->ifindex; >> sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); >> @@ -1120,7 +1129,7 @@ static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb, >> } while (sknext); >> } else >> kfree_skb(skb); >> - read_unlock(&udp_hash_lock); >> + rcu_read_unlock(); >> return 0; >> } >> > ... > > Aren't other functions like sk_next() or sk_unhashed() used on the > read side and need _rcu versions? > It also needs sk_next_rcu(). sk_unhashed() is only used on the update side, so an rcu version is not needed there. Thanks for pointing this out. -corey -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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