FAILED: patch "[PATCH] IB/hfi1: Shutdown self-rearming timers before freeing" failed to apply to 6.1-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 6.1-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-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 9d3259e41ccd5016cd2c6d013232b89df6d73011
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107054336-failed-6.1-9d3259e41ccd@kernel.org' --subject-prefix 'PATCH 6.1.y' 'HEAD^..'

Thanks,
Sasha

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

From 9d3259e41ccd5016cd2c6d013232b89df6d73011 Mon Sep 17 00:00:00 2001
From: Runyu Xiao <runyu.xiao@seu.edu.cn>
Date: Wed, 30 Sep 2026 15:04:55 +0800
Subject: [PATCH] IB/hfi1: Shutdown self-rearming timers before freeing

The HFI1 receive error and synthetic counter timers rearm themselves from
their callbacks. Their cleanup paths use timer_delete_sync(), which only
waits for a running callback and does not prevent a concurrent or
subsequent rearm.

Use timer_shutdown_sync() when releasing these timers. This prevents a
callback from enqueueing either timer after cleanup begins, before the
containing hfi1_devdata is freed.

Preserve the existing work cancellation and workqueue destruction ordering
for synthetic counters.

Fixes: 7724105686e7 ("IB/hfi1: add driver files")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Signed-off-by: Runyu Xiao <runyu.xiao@seu.edu.cn>
Link: https://patch.msgid.link/20260930070455.2934286-1-runyu.xiao@seu.edu.cn
Signed-off-by: Leon Romanovsky <leon@kernel.org>
---
 drivers/infiniband/hw/hfi1/chip.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c
index 592e330e74bf1..faa724ca33bd7 100644
--- a/drivers/infiniband/hw/hfi1/chip.c
+++ b/drivers/infiniband/hw/hfi1/chip.c
@@ -5567,7 +5567,7 @@ static int init_rcverr(struct hfi1_devdata *dd)
 static void free_rcverr(struct hfi1_devdata *dd)
 {
 	if (dd->rcverr_timer.function)
-		timer_delete_sync(&dd->rcverr_timer);
+		timer_shutdown_sync(&dd->rcverr_timer);
 }
 
 static void handle_rxe_err(struct hfi1_devdata *dd, u32 unused, u64 reg)
@@ -12300,7 +12300,7 @@ static void free_cntrs(struct hfi1_devdata *dd)
 	int i;
 
 	if (dd->synth_stats_timer.function)
-		timer_delete_sync(&dd->synth_stats_timer);
+		timer_shutdown_sync(&dd->synth_stats_timer);
 	cancel_work_sync(&dd->update_cntr_work);
 	ppd = (struct hfi1_pportdata *)(dd + 1);
 	for (i = 0; i < dd->num_pports; i++, ppd++) {
-- 
2.53.0