Revert "serial: 8250, disable "too much work" messages"

This reverts commit f4f653e.

Jiri writes:
	No, please drop this one. We need a better solution as it turned
	out that some boxes need 16k loops and it will increase with new
	processors :(.

Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Martin Pluskal <mpluskal@suse.com>
Cc: Takashi Iwai <tiwai@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_core.c

@@ -1601,7 +1601,8 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
 		l = l->next;
 
 		if (l == i->head && pass_counter++ > PASS_LIMIT) {
-			pr_debug_ratelimited(
+			/* If we hit this, we're dead. */
+			printk_ratelimited(KERN_ERR
 				"serial8250: too much work for irq%d\n", irq);
 			break;
 		}