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>

1 files changed, 1 insertions, 7 deletions

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index a097a773bc76..0d0401802d4f 100644
--- 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);