Commit 0c4989b5 authored Dec 02, 2015 by Junjie Wu Committed by Stephen Boyd Mar 20, 2017

cpufreq: interactive: Fix potential divide-by-zero operation



prev_load could be zero if no active time is registered for a CPU
within a sampling period. Fix potential divide-by-zero issue when
calculating new load percentage.

Change-Id: I8ad118f5b6b94a410ec59eb5ce939b9467e921c7
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>
Signed-off-by: Hanumath Prasad <hpprasad@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

parent 433ed997

drivers/cpufreq/cpufreq_interactive.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -502,7 +502,10 @@ static void __cpufreq_interactive_timer(unsigned long data, bool is_notif)
		cputime_speedadj = (u64)sl->prev_load *
		ppol->policy->cpuinfo.max_freq;
		do_div(cputime_speedadj, tunables->timer_rate);
		new_load_pct = sl->new_task_load * 100 / sl->prev_load;
		new_load_pct = 0;
		if (sl->prev_load)
		new_load_pct = sl->new_task_load * 100 /
		sl->prev_load;
		} else {
		now = update_load(i);
		delta_time = (unsigned int)