linux-kernel - Re: [PATCH V5 0/7] cpufreq: suspend early/resume late: dpm

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Message-ID: <CAKohpo=JVUPV81hFmwpuweWrfoEGZ0S_pkb9Fd+-SCXy+O+QCQ@mail.gmail.com>
Date:	Mon, 17 Feb 2014 11:32:55 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nishanth Menon <nm@...com>, Kgene Kim <kgene.kim@...sung.com>,
	jinchoi@...adcom.com, Lan Tianyu <tianyu.lan@...el.com>,
	Sebastian Capella <sebastian.capella@...aro.org>,
	Jonghwan Choi <jhbird.choi@...sung.com>
Subject: Re: [PATCH V5 0/7] cpufreq: suspend early/resume late: dpm_{suspend|resume}()

On 15 February 2014 01:52, Stephen Warren <swarren@...dotorg.org> wrote:
> BTW, I also happened to test these on a Tegra114 system, on which there
> is no cpufreq driver, and this series (applied on top of commit
> 9398a10cd964 Merge tag 'regulator-v3.14-rc2') causes the following
> during suspend:

Ahh, that's a obvious bug. Following would fix it, thanks:

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index c13c100..2dfbb7e 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1617,6 +1617,9 @@ void cpufreq_suspend(void)
 {
        struct cpufreq_policy *policy;

+       if (!cpufreq_driver)
+               return;
+
        if (!has_target())
                return;

@@ -1645,6 +1648,9 @@ void cpufreq_resume(void)
 {
        struct cpufreq_policy *policy;

+       if (!cpufreq_driver)
+               return;
+
        if (!has_target())
                return;
--
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