netdev - Re: [PATCH net-next v3 06/15] net: bridge: mcast: add support for group query retransmit

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Message-ID: <20200906143203.011eb7ea@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Sun, 6 Sep 2020 14:32:03 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Cc:     netdev@...r.kernel.org, roopa@...dia.com,
        bridge@...ts.linux-foundation.org, davem@...emloft.net
Subject: Re: [PATCH net-next v3 06/15] net: bridge: mcast: add support for
 group query retransmit

On Mon, 7 Sep 2020 00:14:51 +0300 Nikolay Aleksandrov wrote:
> On 9/7/20 12:01 AM, Jakub Kicinski wrote:
> > On Sat,  5 Sep 2020 11:24:01 +0300 Nikolay Aleksandrov wrote:  
> >> We need to be able to retransmit group-specific and group-and-source
> >> specific queries. The new timer takes care of those.  
> > 
> > What guarantees that timer will not use pg after free? Do timer
> > callbacks hold the RCU read lock?
> 
> See the last patch, it guarantees no entry timer will be used when it's freed.

Ack.