tcp/dccp: do not care about families in inet_twsk_purge()

[ Upstream commit 1eeb5043573981f3a1278876515851b7f6b1df1b ]

We lost ability to unload ipv6 module a long time ago.

Instead of calling expensive inet_twsk_purge() twice,
we can handle all families in one round.

Also remove an extra line added in my prior patch,
per Kuniyuki Iwashima feedback.

BUG=b/372637997
TEST=presubmit
RELEASE_NOTE=None

cos-patch: security-moderate
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/netdev/20240327192934.6843-1-kuniyu@amazon.com/
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/20240329153203.345203-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 565d121b6998 ("tcp: prevent concurrent execution of tcp_sk_exit_batch")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Change-Id: I15fd9dde49720d5c944f3e4ed1d450c1a038a6af
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/84140
Reviewed-by: Kevin Berry <kpberry@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
8 files changed