linux-kernel - Re: [PATCH 06/14] cpufreq: cpu0: defer probe if clock isn't registered yet

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Message-ID: <CAKohpomzPHRghqHD7-tDbj0gXzc=ANEb3qLv2kRKOZUyqatBew@mail.gmail.com>
Date:	Wed, 2 Jul 2014 11:25:38 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arvind Chauhan <arvind.chauhan@....com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-arm-msm@...r.kernel.org, Sachin Kamat <spk.linux@...il.com>,
	Thomas P Abraham <thomas.ab@...sung.com>,
	Nishanth Menon <nm@...com>, Tomasz Figa <t.figa@...sung.com>
Subject: Re: [PATCH 06/14] cpufreq: cpu0: defer probe if clock isn't
 registered yet

On 2 July 2014 11:23, Shawn Guo <shawn.guo@...aro.org> wrote:
> On Tue, Jul 01, 2014 at 10:02:35PM +0530, Viresh Kumar wrote:

>> diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c
>> index 4273a5f..b5b8e1c 100644
>> --- a/drivers/cpufreq/cpufreq-cpu0.c
>> +++ b/drivers/cpufreq/cpufreq-cpu0.c
>> @@ -150,8 +150,17 @@ static int cpu0_cpufreq_probe(struct platform_device *pdev)
>>
>>       cpu_clk = clk_get(cpu_dev, NULL);
>>       if (IS_ERR(cpu_clk)) {
>> -             ret = PTR_ERR(cpu_clk);
>
> If you keep this ...
>
>> -             pr_err("failed to get cpu0 clock: %d\n", ret);
>> +             /*
>> +              * If cpu's clk node is present, but clock is not yet
>> +              * registered, we should try defering probe.
>> +              */
>> +             if (PTR_ERR(cpu_clk) == -EPROBE_DEFER) {
>
> ... you can use 'ret' here ...
>
>> +                     dev_err(cpu_dev, "cpu0 clock not ready, retry\n");
>> +                     ret = -EPROBE_DEFER;
>
> ... this can be saved ...
>
>> +             } else {
>> +                     ret = PTR_ERR(cpu_clk);
>
> ... and this as well.

All accepted. Thanks.
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