linux-kernel - Re: [PATCH v1] clocksource/timer-atmel-pit:- Fix resource leaks in error paths.

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Date:   Thu, 18 May 2017 16:03:48 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:     nicolas.ferre@...el.com, tglx@...utronix.de,
        daniel.lezcano@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] clocksource/timer-atmel-pit:- Fix resource leaks in
 error paths.

Hi,
Yes i have tested on board SBC6045 with Atmel SoC.

Commit message  " Handle return error in at91sam926x_pit_dt_init.
at91sam926x_pit_dt_init can fail here. We must have released memory
and clock "

is this fine?

Regards
-Arvind

On Thursday 18 May 2017 02:56 PM, Alexandre Belloni wrote:
> Hi,
>
> This needs a proper commit message. Also, can you tell us on which SoC
> you tested your changes?
>
> On 05/05/2017 at 18:21:48 +0530, Arvind Yadav wrote:
>> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
>> ---
>>   drivers/clocksource/timer-atmel-pit.c | 30 +++++++++++++++++++++++-------
>>   1 file changed, 23 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c
>> index c0b5df3..28b0cd3 100644
>> --- a/drivers/clocksource/timer-atmel-pit.c
>> +++ b/drivers/clocksource/timer-atmel-pit.c
>> @@ -180,26 +180,29 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
>>   	data->base = of_iomap(node, 0);
>>   	if (!data->base) {
>>   		pr_err("Could not map PIT address\n");
>> -		return -ENXIO;
>> +		ret = -ENXIO;
>> +		goto error_free;
>>   	}
>>   
>>   	data->mck = of_clk_get(node, 0);
>>   	if (IS_ERR(data->mck)) {
>>   		pr_err("Unable to get mck clk\n");
>> -		return PTR_ERR(data->mck);
>> +		ret = PTR_ERR(data->mck);
>> +		goto error_iounmap;
>>   	}
>>   
>>   	ret = clk_prepare_enable(data->mck);
>>   	if (ret) {
>>   		pr_err("Unable to enable mck\n");
>> -		return ret;
>> +		goto error_clk_put;
>>   	}
>>   
>>   	/* Get the interrupts property */
>>   	data->irq = irq_of_parse_and_map(node, 0);
>>   	if (!data->irq) {
>>   		pr_err("Unable to get IRQ from DT\n");
>> -		return -EINVAL;
>> +		ret = -EINVAL;
>> +		goto error_clk_disable;
>>   	}
>>   
>>   	/*
>> @@ -223,11 +226,11 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
>>   	data->clksrc.rating = 175;
>>   	data->clksrc.read = read_pit_clk;
>>   	data->clksrc.flags = CLOCK_SOURCE_IS_CONTINUOUS;
>> -	
>> +
>>   	ret = clocksource_register_hz(&data->clksrc, pit_rate);
>>   	if (ret) {
>>   		pr_err("Failed to register clocksource");
>> -		return ret;
>> +		goto error_clk_disable;
>>   	}
>>   
>>   	/* Set up irq handler */
>> @@ -236,7 +239,7 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
>>   			  "at91_tick", data);
>>   	if (ret) {
>>   		pr_err("Unable to setup IRQ\n");
>> -		return ret;
>> +		goto error_unregister_clk;
>>   	}
>>   
>>   	/* Set up and register clockevents */
>> @@ -254,6 +257,19 @@ static int __init at91sam926x_pit_dt_init(struct device_node *node)
>>   	clockevents_register_device(&data->clkevt);
>>   
>>   	return 0;
>> +
>> +error_unregister_clk:
>> +	clocksource_unregister(&data->clksrc);
>> +error_clk_disable:
>> +	clk_disable_unprepare(data->mck);
>> +error_clk_put:
>> +	clk_put(data->mck);
>> +error_iounmap:
>> +	iounmap(data->base);
>> +error_free:
>> +	kfree(data);
>> +
>> +	return ret;
>>   }
>>   CLOCKSOURCE_OF_DECLARE(at91sam926x_pit, "atmel,at91sam9260-pit",
>>   		       at91sam926x_pit_dt_init);
>> -- 
>> 1.9.1
>>
>>