linux-kernel - Re: [PATCH] cpufreq: scmi: process the result of devm_of_clk_add_hw

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Date:   Sat, 18 Nov 2023 08:00:27 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Александра Дюпина 
        <adiupina@...ralinux.ru>, Sudeep Holla <sudeep.holla@....com>
Cc:     Cristian Marussi <cristian.marussi@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] cpufreq: scmi: process the result of
 devm_of_clk_add_hw_provider()

Le 17/11/2023 à 12:14, Александра Дюпина a écrit :
> I'm sorry, I forgot to add "return ret;" after
> calling the dev_err() function. Before I post
> the second version of the patch, please let me
> know what you think about this fix, keeping in
> mind what I wanted to add "return ret;"

This is a probe function.
So, maybe using dev_err_probe() would be slightly nicer?

If yes, the dev_err() that is already there could be updated as well in 
an other patch.

CJ

> 
> 17.11.2023 10:49, Alexandra Diupina пишет:
>> devm_of_clk_add_hw_provider() may return an errno, so
>> add a return value check
>>
>> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>>
>> Fixes: 8410e7f3b31e ("cpufreq: scmi: Fix OPP addition failure with a 
>> dummy clock provider")
>> Signed-off-by: Alexandra Diupina <adiupina@...ralinux.ru>
>> ---
>>   drivers/cpufreq/scmi-cpufreq.c | 9 +++++++--
>>   1 file changed, 7 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/cpufreq/scmi-cpufreq.c 
>> b/drivers/cpufreq/scmi-cpufreq.c
>> index c8a7ccc42c16..4037945663bf 100644
>> --- a/drivers/cpufreq/scmi-cpufreq.c
>> +++ b/drivers/cpufreq/scmi-cpufreq.c
>> @@ -334,8 +334,13 @@ static int scmi_cpufreq_probe(struct scmi_device 
>> *sdev)
>>   #ifdef CONFIG_COMMON_CLK
>>       /* dummy clock provider as needed by OPP if clocks property is 
>> used */
>> -    if (of_property_present(dev->of_node, "#clock-cells"))
>> -        devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, NULL);
>> +    if (of_property_present(dev->of_node, "#clock-cells")) {
>> +        ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, 
>> NULL);
>> +        if (ret) {
>> +            dev_err(dev, "%s: registering clock provider failed, err: 
>> %d\n",
>> +                __func__, ret);
>> +        }
>> +    }
>>   #endif
>>       ret = cpufreq_register_driver(&scmi_cpufreq_driver);
> 
> 
> Regards,
> 
> Alexandra Diupina
>