ipv6: remove leftover ip6 cookie initializer

[ Upstream commit 54580ccdd8a9c6821fd6f72171d435480867e4c3 ]

As of the blamed commit ipc6.dontfrag is always initialized at the
start of udpv6_sendmsg, by ipcm6_init_sk, to either 0 or 1.

Later checks against -1 are no longer needed and the branches are now
dead code.

The blamed commit had removed those branches. But I had overlooked
this one case.

UDP has both a lockless fast path and a slower path for corked
requests. This branch remained in the fast path.

Fixes: 096208592b09 ("ipv6: replace ipcm6_init calls with ipcm6_init_sk")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250307033620.411611-2-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index eb636bec89796ee1223d2e84890369c34e88a891..581bc62890818e121f125f295c46fcddc15cbc3a 100644 (file)
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -2055,8 +2055,6 @@ struct sk_buff *ip6_make_skb(struct sock *sk,
                ip6_cork_release(cork, &v6_cork);
                return ERR_PTR(err);
        }
-       if (ipc6->dontfrag < 0)
-               ipc6->dontfrag = inet6_test_bit(DONTFRAG, sk);
 
        err = __ip6_append_data(sk, &queue, cork, &v6_cork,
                                &current->task_frag, getfrag, from,