--- /dev/null
+From 44d9b3f584c59a606b521e7274e658d5b866c699 Mon Sep 17 00:00:00 2001
+From: Ian Abbott <abbotti@mev.co.uk>
+Date: Tue, 15 Apr 2025 13:39:01 +0100
+Subject: comedi: jr3_pci: Fix synchronous deletion of timer
+
+From: Ian Abbott <abbotti@mev.co.uk>
+
+commit 44d9b3f584c59a606b521e7274e658d5b866c699 upstream.
+
+When `jr3_pci_detach()` is called during device removal, it calls
+`timer_delete_sync()` to stop the timer, but the timer expiry function
+always reschedules the timer, so the synchronization is ineffective.
+
+Call `timer_shutdown_sync()` instead. It does not matter that the timer
+expiry function pointer is cleared, because the device is being removed.
+
+Fixes: 07b509e6584a5 ("Staging: comedi: add jr3_pci driver")
+Cc: stable <stable@kernel.org>
+Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
+Link: https://lore.kernel.org/r/20250415123901.13483-1-abbotti@mev.co.uk
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/comedi/drivers/jr3_pci.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/comedi/drivers/jr3_pci.c
++++ b/drivers/comedi/drivers/jr3_pci.c
+@@ -758,7 +758,7 @@ static void jr3_pci_detach(struct comedi
+ struct jr3_pci_dev_private *devpriv = dev->private;
+
+ if (devpriv)
+- del_timer_sync(&devpriv->timer);
++ timer_shutdown_sync(&devpriv->timer);
+
+ comedi_pci_detach(dev);
+ }