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

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Message-ID: <20200906140136.77ae178d@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Sun, 6 Sep 2020 14:01:36 -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 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?