netdev - Re: [PATCH net] netpoll: Use rtnl_dereference() for npinfo pointer access

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Message-ID: <Zz-_15xseWSPHLqg@gondor.apana.org.au>
Date: Fri, 22 Nov 2024 07:18:47 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Breno Leitao <leitao@...ian.org>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Michal Kubiak <michal.kubiak@...el.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH net] netpoll: Use rtnl_dereference() for npinfo pointer
 access

On Thu, Nov 21, 2024 at 06:58:58AM -0800, Breno Leitao wrote:
> In the __netpoll_setup() function, when accessing the device's npinfo
> pointer, replace rcu_access_pointer() with rtnl_dereference(). This
> change is more appropriate, as suggested by Herbert Xu.
> 
> The function is called with the RTNL mutex held, and the pointer is
> being dereferenced later, so, dereference earlier and just reuse the
> pointer for the if/else.
> 
> The replacement ensures correct pointer access while maintaining
> the existing locking and RCU semantics of the netpoll subsystem.
> 
> Fixes: c75964e40e69 ("netpoll: Use rtnl_dereference() for npinfo pointer access")
> Suggested-by: Herbert Xu <herbert@...dor.apana.org.au>
> Signed-off-by: Breno Leitao <leitao@...ian.org>
> ---
>  net/core/netpoll.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt