powerpc: Rearrange and fix show_interrupts() for sparse irq_descs

Move the default case out of the if, ie. when we're just displaying
an irq. And consolidate all the odd cases at the top, ie. printing
the header and footer.

And in the process cope with sparse irq_descs.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/irq.c

@@ -187,14 +187,30 @@ int show_interrupts(struct seq_file *p, void *v)
 		for_each_online_cpu(j)
 			seq_printf(p, "CPU%d       ", j);
 		seq_putc(p, '\n');
+	} else if (i == nr_irqs) {
+#if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
+		if (tau_initialized){
+			seq_puts(p, "TAU: ");
+			for_each_online_cpu(j)
+				seq_printf(p, "%10u ", tau_interrupts(j));
+			seq_puts(p, "  PowerPC             Thermal Assist (cpu temp)\n");
+		}
+#endif /* CONFIG_PPC32 && CONFIG_TAU_INT*/
+		seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
+
+		return 0;
 	}
 
-	if (i < NR_IRQS) {
 	desc = irq_to_desc(i);
+	if (!desc)
+		return 0;
+
 	spin_lock_irqsave(&desc->lock, flags);
+
 	action = desc->action;
 	if (!action || !action->handler)
 		goto skip;
+
 	seq_printf(p, "%3d: ", i);
 #ifdef CONFIG_SMP
 	for_each_online_cpu(j)
@@ -202,28 +218,22 @@ int show_interrupts(struct seq_file *p, void *v)
 #else
 	seq_printf(p, "%10u ", kstat_irqs(i));
 #endif /* CONFIG_SMP */
+
 	if (desc->chip)
 		seq_printf(p, " %s ", desc->chip->typename);
 	else
 		seq_puts(p, "  None      ");
+
 	seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge  ");
 	seq_printf(p, "    %s", action->name);
+
 	for (action = action->next; action; action = action->next)
 		seq_printf(p, ", %s", action->name);
 	seq_putc(p, '\n');
+
 skip:
 	spin_unlock_irqrestore(&desc->lock, flags);
-	} else if (i == NR_IRQS) {
-#if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT)
-		if (tau_initialized){
-			seq_puts(p, "TAU: ");
-			for_each_online_cpu(j)
-				seq_printf(p, "%10u ", tau_interrupts(j));
-			seq_puts(p, "  PowerPC             Thermal Assist (cpu temp)\n");
-		}
-#endif /* CONFIG_PPC32 && CONFIG_TAU_INT*/
-		seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
-	}
+
 	return 0;
 }