netdev - Re: [PATCH net-next v2] ppp: remove rwlock usage

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20250805160333.3bee2d40@kernel.org>
Date: Tue, 5 Aug 2025 16:03:33 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Qingfang Deng <dqfext@...il.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, linux-ppp@...r.kernel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2] ppp: remove rwlock usage

On Tue,  5 Aug 2025 10:49:33 +0800 Qingfang Deng wrote:
> In struct channel, the upl lock is implemented using rwlock_t,
> protecting access to pch->ppp and pch->bridge.
> 
> As previously discussed on the list, using rwlock in the network fast
> path is not recommended.
> This patch replaces the rwlock with a spinlock for writers, and uses RCU
> for readers.
> 
> - pch->ppp and pch->bridge are now declared as __rcu pointers.
> - Readers use rcu_dereference_bh() under rcu_read_lock_bh().
> - Writers use spin_lock() to update, followed by synchronize_rcu()
>   where required.

## Form letter - net-next-closed

We have already submitted our pull request with net-next material for v6.17,
and therefore net-next is closed for new drivers, features, code refactoring
and optimizations. We are currently accepting bug fixes only.

Please repost when net-next reopens after Aug 11th.

RFC patches sent for review only are obviously welcome at any time.

See: https://www.kernel.org/doc/html/next/process/maintainer-netdev.html#development-cycle
-- 
pw-bot: defer
pv-bot: closed