FAILED: patch "[PATCH] mptcp: pm: do not remove already closed subflows" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 58e1b66b4e4b8a602d3f2843e8eba00a969ecce2
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024083057-italics-abrasion-ab81@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

58e1b66b4e4b ("mptcp: pm: do not remove already closed subflows")
967d3c27127e ("mptcp: fix data races on remote_id")
a7cfe7766370 ("mptcp: fix data races on local_id")
84c531f54ad9 ("mptcp: userspace pm send RM_ADDR for ID 0")
f1f26512a9bf ("mptcp: use plain bool instead of custom binary enum")
1e07938e29c5 ("net: mptcp: rename netlink handlers to mptcp_pm_nl_<blah>_{doit,dumpit}")
1d0507f46843 ("net: mptcp: convert netlink from small_ops to ops")
fce68b03086f ("mptcp: add scheduled in mptcp_subflow_context")
1730b2b2c5a5 ("mptcp: add sched in mptcp_sock")
740ebe35bd3f ("mptcp: add struct mptcp_sched_ops")
a7384f391875 ("Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 58e1b66b4e4b8a602d3f2843e8eba00a969ecce2 Mon Sep 17 00:00:00 2001
From: "Matthieu Baerts (NGI0)" <matttbe@kernel.org>
Date: Wed, 28 Aug 2024 08:14:32 +0200
Subject: [PATCH] mptcp: pm: do not remove already closed subflows

It is possible to have in the list already closed subflows, e.g. the
initial subflow has been already closed, but still in the list. No need
to try to close it again, and increments the related counters again.

Fixes: 0ee4261a3681 ("mptcp: implement mptcp_pm_remove_subflow")
Cc: stable@vger.kernel.org
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 5a84a55e37cc..3ff273e219f2 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -838,6 +838,8 @@ static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp_sock *msk,
 			int how = RCV_SHUTDOWN | SEND_SHUTDOWN;
 			u8 id = subflow_get_local_id(subflow);
 
+			if (inet_sk_state_load(ssk) == TCP_CLOSE)
+				continue;
 			if (rm_type == MPTCP_MIB_RMADDR && remote_id != rm_id)
 				continue;
 			if (rm_type == MPTCP_MIB_RMSUBFLOW && id != rm_id)