netdev - [PATCH net-next 02/10] af_packet: preserve const qualifier in pkt

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Date:   Fri, 17 Mar 2023 15:55:31 +0000
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, David Ahern <dsahern@...nel.org>,
        Simon Horman <simon.horman@...igine.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 02/10] af_packet: preserve const qualifier in pkt_sk()

We can change pkt_sk() to propagate const qualifier of its argument,
thanks to container_of_const()

This should avoid some potential errors caused by accidental
(const -> not_const) promotion.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Willem de Bruijn <willemb@...gle.com>
---
 net/packet/internal.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/net/packet/internal.h b/net/packet/internal.h
index 680703dbce5e04fc26d0fdeab1c1c911b71a8729..e793e99646f1c60f61a8dc5e765f8f544de83972 100644
--- a/net/packet/internal.h
+++ b/net/packet/internal.h
@@ -133,10 +133,7 @@ struct packet_sock {
 	atomic_t		tp_drops ____cacheline_aligned_in_smp;
 };
 
-static inline struct packet_sock *pkt_sk(struct sock *sk)
-{
-	return (struct packet_sock *)sk;
-}
+#define pkt_sk(ptr) container_of_const(ptr, struct packet_sock, sk)
 
 enum packet_sock_flags {
 	PACKET_SOCK_ORIGDEV,
-- 
2.40.0.rc2.332.ga46443480c-goog