static void analyze_cpu_temp()

in char/bbc_envctrl.c [224:277]

• 45 lines of code
• 13 McCabe index (conditional complexity)

static void analyze_cpu_temp(struct bbc_cpu_temperature *tp, unsigned long *last_warn, int tick)
{
	int ret = 0;

	if (time_after(jiffies, (*last_warn + WARN_INTERVAL))) {
		if (tp->curr_cpu_temp >=
		    cpu_temp_limits[tp->index].high_warn) {
			printk(KERN_WARNING "temp%d: "
			       "Above safe CPU operating temperature, %d C.\n",
			       tp->index, (int) tp->curr_cpu_temp);
			ret = 1;
		} else if (tp->curr_cpu_temp <
			   cpu_temp_limits[tp->index].low_warn) {
			printk(KERN_WARNING "temp%d: "
			       "Below safe CPU operating temperature, %d C.\n",
			       tp->index, (int) tp->curr_cpu_temp);
			ret = 1;
		}
		if (ret)
			*last_warn = jiffies;
	} else if (tp->curr_cpu_temp >= cpu_temp_limits[tp->index].high_warn ||
		   tp->curr_cpu_temp < cpu_temp_limits[tp->index].low_warn)
		ret = 1;

	/* Now check the shutdown limits. */
	if (tp->curr_cpu_temp >= cpu_temp_limits[tp->index].high_shutdown ||
	    tp->curr_cpu_temp < cpu_temp_limits[tp->index].low_shutdown) {
		do_envctrl_shutdown(tp);
		ret = 1;
	}

	if (ret) {
		tp->fan_todo[FAN_CPU] = FAN_FULLBLAST;
	} else if ((tick & (8 - 1)) == 0) {
		s8 cpu_goal_hi = cpu_temp_limits[tp->index].high_warn - 10;
		s8 cpu_goal_lo;

		cpu_goal_lo = cpu_goal_hi - 3;

		/* We do not try to avoid 'too cold' events.  Basically we
		 * only try to deal with over-heating and fan noise reduction.
		 */
		if (tp->avg_cpu_temp < cpu_goal_hi) {
			if (tp->avg_cpu_temp >= cpu_goal_lo)
				tp->fan_todo[FAN_CPU] = FAN_SAME;
			else
				tp->fan_todo[FAN_CPU] = FAN_SLOWER;
		} else {
			tp->fan_todo[FAN_CPU] = FAN_FASTER;
		}
	} else {
		tp->fan_todo[FAN_CPU] = FAN_SAME;
	}
}