We should always get rid of it. I don't see a reason to keep the timer
alive if the devices are going away. This looks like a memory leak.

(hmp) device_add virtio-mouse-pci,id=test
(hmp) device_del test
-> guest notified, timer pending.
-> guest does not react for some reason (e.g. crash)
-> s390_pcihost_timer_cb(). Timer not pending anymore. qmp_unplug().

-> Device deleted. Timer expired (not pending) but not freed.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 hw/s390x/s390-pci-bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 936ad14030..1349050838 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -982,7 +982,7 @@ static void s390_pcihost_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
         return;
     }
 
-    if (pbdev->release_timer && timer_pending(pbdev->release_timer)) {
+    if (pbdev->release_timer) {
         timer_del(pbdev->release_timer);
         timer_free(pbdev->release_timer);
         pbdev->release_timer = NULL;
-- 
2.17.2