--- zzzz-none-000/linux-5.15.111/drivers/char/hpet.c	2023-05-11 14:00:40.000000000 +0000
+++ puma7-atom-6670-761/linux-5.15.111/drivers/char/hpet.c	2024-02-07 10:22:37.000000000 +0000
@@ -276,8 +276,13 @@
 			}
 
 	if (!devp) {
+		char comm[TASK_COMM_LEN];
+
 		spin_unlock_irq(&hpet_lock);
 		mutex_unlock(&hpet_mutex);
+		pr_warn("hpet: No free device for process %d (comm=%s)\n",
+				task_pid_nr(current),
+				get_task_comm(comm, current));
 		return -EBUSY;
 	}