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

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Message-ID: <4f8ec4f0-6311-3b18-c7c4-a3a49b8d94b4@cumulusnetworks.com>
Date:   Mon, 7 Sep 2020 00:14:51 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Jakub Kicinski <kuba@...nel.org>
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 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.