x86: xen: Sanitise sparse_irq handling

There seems to be more cleanups possible, but that's left to the xen
experts :)

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 13365ba..7d24b0d 100644 (file)
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -338,30 +338,29 @@ static void unmask_evtchn(int port)
 
 static int find_unbound_irq(void)
 {
-       int irq;
-       struct irq_desc *desc;
+       struct irq_data *data;
+       int irq, res;
 
        for (irq = 0; irq < nr_irqs; irq++) {
-               desc = irq_to_desc(irq);
+               data = irq_get_irq_data(irq);
                /* only 0->15 have init'd desc; handle irq > 16 */
-               if (desc == NULL)
+               if (!data)
                        break;
-               if (desc->chip == &no_irq_chip)
+               if (data->chip == &no_irq_chip)
                        break;
-               if (desc->chip != &xen_dynamic_chip)
+               if (data->chip != &xen_dynamic_chip)
                        continue;
                if (irq_info[irq].type == IRQT_UNBOUND)
-                       break;
+                       return irq;
        }
 
        if (irq == nr_irqs)
                panic("No available IRQ to bind to: increase nr_irqs!\n");
 
-       desc = irq_to_desc_alloc_node(irq, 0);
-       if (WARN_ON(desc == NULL))
-               return -1;
+       res = irq_alloc_desc_at(irq, 0);
 
-       dynamic_irq_init_keep_chip_data(irq);
+       if (WARN_ON(res != irq))
+               return -1;
 
        return irq;
 }
@@ -495,7 +494,7 @@ static void unbind_from_irq(unsigned int irq)
        if (irq_info[irq].type != IRQT_UNBOUND) {
                irq_info[irq] = mk_unbound_info();
 
-               dynamic_irq_cleanup(irq);
+               irq_free_desc(irq);
        }
 
        spin_unlock(&irq_mapping_update_lock);