x86/ioapic.c: convert io_apic_level_ack_pending loop to normal for() loop

Convert the unconventional loop in io_apic_level_ack_pending() to
a conventional for() loop.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index a097a77..0d04018 100644 (file)
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -410,13 +410,10 @@ static bool io_apic_level_ack_pending(struct irq_cfg *cfg)
        unsigned long flags;
 
        spin_lock_irqsave(&ioapic_lock, flags);
-       entry = cfg->irq_2_pin;
-       for (;;) {
+       for (entry = cfg->irq_2_pin; entry != NULL; entry = entry->next) {
                unsigned int reg;
                int pin;
 
-               if (!entry)
-                       break;
                pin = entry->pin;
                reg = io_apic_read(entry->apic, 0x10 + pin*2);
                /* Is the remote IRR bit set? */
@@ -424,9 +421,6 @@ static bool io_apic_level_ack_pending(struct irq_cfg *cfg)
                        spin_unlock_irqrestore(&ioapic_lock, flags);
                        return true;
                }
-               if (!entry->next)
-                       break;
-               entry = entry->next;
        }
        spin_unlock_irqrestore(&ioapic_lock, flags);