linux-kernel - Re: [PATCH AUTOSEL 6.0 17/77] genetlink: hold read cb_lock during iteration of genl_fam_idr in genl

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Date:   Mon, 10 Oct 2022 08:49:46 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Jiri Pirko <jiri@...dia.com>,
        Vikas Gupta <vikas.gupta@...adcom.com>, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, nicolas.dichtel@...nd.com,
        gnault@...hat.com, johannes@...solutions.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 6.0 17/77] genetlink: hold read cb_lock during
 iteration of genl_fam_idr in genl_bind()

On Sun,  9 Oct 2022 18:06:54 -0400 Sasha Levin wrote:
> In genl_bind(), currently genl_lock and write cb_lock are taken
> for iteration of genl_fam_idr and processing of static values
> stored in struct genl_family. Take just read cb_lock for this task
> as it is sufficient to guard the idr and the struct against
> concurrent genl_register/unregister_family() calls.
> 
> This will allow to run genl command processing in genl_rcv() and
> mnl_socket_setsockopt(.., NETLINK_ADD_MEMBERSHIP, ..) in parallel.

Not stable material, please drop.