1 files changed, 3 insertions, 15 deletions

diff --git a/arch/x86/kernel/time_32.c b/arch/x86/kernel/time_32.c
index 7a26bcf887f6..ec729cdcfa3d 100644
--- a/arch/x86/kernel/time_32.c
+++ b/arch/x86/kernel/time_32.c
@@ -78,21 +78,9 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
 
         global_clock_event->event_handler(global_clock_event);
 
-#ifdef CONFIG_MCA
-        if (MCA_bus) {
-                /* The PS/2 uses level-triggered interrupts.  You can't
-                turn them off, nor would you want to (any attempt to
-                enable edge-triggered interrupts usually gets intercepted by a
-                special hardware circuit).  Hence we have to acknowledge
-                the timer interrupt.  Through some incredibly stupid
-                design idea, the reset for IRQ 0 is done by setting the
-                high bit of the PPI port B (0x61).  Note that some PS/2s,
-                notably the 55SX, work fine if this is removed.  */
-
-                u8 irq_v = inb_p(0x61);         /* read the current state */
-                outb_p(irq_v | 0x80, 0x61);     /* reset the IRQ */
-        }
-#endif
+        /* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */
+        if (MCA_bus)
+                outb_p(inb_p(0x61)| 0x80, 0x61);
 
         return IRQ_HANDLED;
 }