netdev - Re: [PATCH net-next 05/10] net: dst: annotate data-races around dst->output

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Message-ID: <CAAVpQUCTdDAmfWjz0y0RXkdWuJ-Z9cBGh1rir1GXGBNOxJKvjg@mail.gmail.com>
Date: Fri, 27 Jun 2025 10:54:42 -0700
From: Kuniyuki Iwashima <kuniyu@...gle.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, David Ahern <dsahern@...nel.org>, 
	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next 05/10] net: dst: annotate data-races around dst->output

On Fri, Jun 27, 2025 at 4:25 AM Eric Dumazet <edumazet@...gle.com> wrote:
>
> dst_dev_put() can overwrite dst->output while other
> cpus might read this field (for instance from dst_output())
>
> Add READ_ONCE()/WRITE_ONCE() annotations to suppress
> potential issues.
>
> We will likely need RCU protection in the future.
>
> Fixes: 4a6ce2b6f2ec ("net: introduce a new function dst_dev_put()")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Reviewed-by: Kuniyuki Iwashima <kuniyu@...gle.com>