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tcp_metrics: do not create an entry from tcp_init_metrics()

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[ Upstream commit a135798e6e ]

tcp_init_metrics() only wants to get metrics if they were
previously stored in the cache. Creating an entry is adding
useless costs, especially when tcp_no_metrics_save is set.

Fixes: 51c5d0c4b1 ("tcp: Maintain dynamic metrics in local cache.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2023-09-22 22:03:55 +00:00 committed by Greg Kroah-Hartman
parent 3f7cb7c47c
commit 2027e74150
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_metrics.c
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@ -478,7 +478,7 @@ void tcp_init_metrics(struct sock *sk)
goto reset;
rcu_read_lock();
tm = tcp_get_metrics(sk, dst, true);
tm = tcp_get_metrics(sk, dst, false);
if (!tm) {
rcu_read_unlock();
goto reset;