linux-kernel - Re: [PATCH 1/5] cpufreq: Introduce cpufreq_notify_post

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Date:	Sun, 1 Dec 2013 08:18:34 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Patch Tracking <patches@...aro.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>
Subject: Re: [PATCH 1/5] cpufreq: Introduce cpufreq_notify_post_transition()

On 1 December 2013 01:50, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Saturday, November 30, 2013 09:26:19 PM Viresh Kumar wrote:
>> This introduces another routine cpufreq_notify_post_transition() which can be
>> used to send POSTCHANGE notification for new freq with or without both
>> {PRE|POST}CHANGE notifications for last freq in case of failures. This is useful
>> at multiple places, specially for sending transition failure notifications.
>>
>> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
>> ---
>>
>> Hi Rafael,
>>
>> Please see if you want to take it for 3.13 or 14, as this fixes bugs which are
>> partly introduced in 3.13..
>
> Which ones?

Patch:

commit d4019f0a92ab802f385cc9c8ad3ab7b5449712cb
Author: Viresh Kumar <viresh.kumar@...aro.org>
Date:   Wed Aug 14 19:38:24 2013 +0530

    cpufreq: move freq change notifications to cpufreq core

adds:

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
+               retval = cpufreq_driver->target_index(policy, index);
+               if (retval)
+                       pr_err("%s: Failed to change cpu frequency: %d\n",
+                                       __func__, retval);
+
+               if (notify) {
+                       /*
+                        * Notify with old freq in case we failed to change
+                        * frequency
+                        */
+                       if (retval)
+                               freqs.new = freqs.old;
+
+                       cpufreq_notify_transition(policy, &freqs,
+                                       CPUFREQ_POSTCHANGE);
+               }


And I thought it might go in 3.13, but surely it doesn't fix any
obvious kernel crashes. It only fixes stuff when target_index() fails.
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