[ARM PATCH] 2252/1: Fix IXP4XX timer interrupt implementation

Patch from Deepak Saxena

The current timer interrupt implementation can cause time to skip
forward by ~65s and causes a 1 minute pause during bootup. The fix
for this was found during 2.4 but got lost in the 2.6 transition.
  
Details @:
  
http://lists.arm.linux.org.uk/pipermail/linux-arm-kernel/2003-September/017171.html
  

Signed-off-by: Deepak Saxena
Signed-off-by: Russell King

arch/arm/mach-ixp4xx/common.c

@@ -229,10 +229,10 @@ static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id, struct pt_regs
 	/*
 	 * Catch up with the real idea of time
 	 */
-	do {	
+	while ((*IXP4XX_OSTS - last_jiffy_time) > LATCH) {
 		timer_tick(regs);
 		last_jiffy_time += LATCH;
-	} while((*IXP4XX_OSTS - last_jiffy_time) > LATCH);
+	}
 
 	write_sequnlock(&xtime_lock);