linux-kernel - Re: [PATCH 11/19] clocksource: fix __ftm_clk

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Date:	Mon, 14 Dec 2015 14:27:47 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Andrzej Hajda <a.hajda@...sung.com>, linux-kernel@...r.kernel.org
Cc:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 11/19] clocksource: fix __ftm_clk_init result

On 12/14/2015 11:34 AM, Andrzej Hajda wrote:
> Hi,
>
> Ping.

[ ... ]

Please as you fix this, also fix the caller.

freq = __ftm_clk_init(np, "ftm-evt-counter-en", "ftm-evt");
-if (freq <= 0)
+if (!freq)

and, by the way, isn't there an issue if in the DT "ftm-src" is declared 
before "ftm-evt" ?


> On 09/24/2015 04:00 PM, Andrzej Hajda wrote:
>> The function tries to return clock frequency (unsigned long) or error
>> (int < 0). Using int as a result could be dangerous. On the other side
>> caller is not interested in error value, so the best solution is to
>> return frequency or zero in case of error, for this unsigned long is OK.
>>
>> The problem has been detected using proposed semantic patch
>> scripts/coccinelle/tests/assign_signed_to_unsigned.cocci [1].
>>
>> [1]: http://permalink.gmane.org/gmane.linux.kernel/2046107
>>
>> Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
>> ---
>> Hi,
>>
>> To avoid problems with too many mail recipients I have sent whole
>> patchset only to LKML. Anyway patches have no dependencies.
>>
>> Regards
>> Andrzej
>> ---
>>   drivers/clocksource/fsl_ftm_timer.c | 8 ++++----
>>   1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/clocksource/fsl_ftm_timer.c b/drivers/clocksource/fsl_ftm_timer.c
>> index ef43469..11a7ae7 100644
>> --- a/drivers/clocksource/fsl_ftm_timer.c
>> +++ b/drivers/clocksource/fsl_ftm_timer.c
>> @@ -248,7 +248,7 @@ static int __init ftm_clocksource_init(unsigned long freq)
>>   	return 0;
>>   }
>>
>> -static int __init __ftm_clk_init(struct device_node *np, char *cnt_name,
>> +static unsigned long __init __ftm_clk_init(struct device_node *np, char *cnt_name,
>>   				 char *ftm_name)
>>   {
>>   	struct clk *clk;
>> @@ -257,19 +257,19 @@ static int __init __ftm_clk_init(struct device_node *np, char *cnt_name,
>>   	clk = of_clk_get_by_name(np, cnt_name);
>>   	if (IS_ERR(clk)) {
>>   		pr_err("ftm: Cannot get \"%s\": %ld\n", cnt_name, PTR_ERR(clk));
>> -		return PTR_ERR(clk);
>> +		return 0;
>>   	}
>>   	err = clk_prepare_enable(clk);
>>   	if (err) {
>>   		pr_err("ftm: clock failed to prepare+enable \"%s\": %d\n",
>>   			cnt_name, err);
>> -		return err;
>> +		return 0;
>>   	}
>>
>>   	clk = of_clk_get_by_name(np, ftm_name);
>>   	if (IS_ERR(clk)) {
>>   		pr_err("ftm: Cannot get \"%s\": %ld\n", ftm_name, PTR_ERR(clk));
>> -		return PTR_ERR(clk);
>> +		return 0;
>>   	}
>>   	err = clk_prepare_enable(clk);
>>   	if (err)
>


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