--- 2.2.11/fs/buffer.c	Thu Aug 12 02:32:33 1999
+++ 2.2.11-kupdate/fs/buffer.c	Sat Aug 14 15:31:24 1999
@@ -1841,13 +1841,18 @@
 	tsk->session = 1;
 	tsk->pgrp = 1;
 	strcpy(tsk->comm, "kupdate");
+
+	/* sigstop and sigcont will stop and wakeup kupdate */
+	spin_lock_irq(&tsk->sigmask_lock);
 	sigfillset(&tsk->blocked);
-	/* sigcont will wakeup kupdate after setting interval to 0 */
 	sigdelset(&tsk->blocked, SIGCONT);
+	sigdelset(&tsk->blocked, SIGSTOP);
+	spin_unlock_irq(&tsk->sigmask_lock);
 
 	lock_kernel();
 
 	for (;;) {
+		/* update interval */
 		interval = bdf_prm.b_un.interval;
 		if (interval)
 		{
@@ -1856,8 +1861,24 @@
 		}
 		else
 		{
+		stop_kupdate:
 			tsk->state = TASK_STOPPED;
 			schedule(); /* wait for SIGCONT */
+		}
+		/* check for sigstop */
+		if (signal_pending(tsk))
+		{
+			int stopped = 0;
+			spin_lock_irq(&tsk->sigmask_lock);
+			if (sigismember(&tsk->signal, SIGSTOP))
+			{
+				sigdelset(&tsk->signal, SIGSTOP);
+				stopped = 1;
+			}
+			recalc_sigpending(tsk);
+			spin_unlock_irq(&tsk->sigmask_lock);
+			if (stopped)
+				goto stop_kupdate;
 		}
 #ifdef DEBUG
 		printk("kupdate() activated...\n");