linux-kernel - Re: [RFC v2 01/13] usb: misc: usb3503: Clean up on driver unbind

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Date:	Fri, 06 May 2016 08:13:28 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Javier Martinez Canillas <javier@....samsung.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-mmc@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-usb@...r.kernel.org,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Brown <broonie@...nel.org>
Cc:	tjakobi@...h.uni-bielefeld.de, m.szyprowski@...sung.com,
	hverkuil@...all.nl,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [RFC v2 01/13] usb: misc: usb3503: Clean up on driver unbind

On 05/05/2016 08:32 PM, Javier Martinez Canillas wrote:
> Hello Krzysztof
> 
> Patch looks good to me, I just have a trivial comment below.
> 
> On 05/05/2016 08:34 AM, Krzysztof Kozlowski wrote:
>> The driver should clean up after itself by unpreparing the clock when it
>> is unbound.
>>
>> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
>> ---
>>  drivers/usb/misc/usb3503.c | 28 ++++++++++++++++++++++++++++
>>  1 file changed, 28 insertions(+)
>>
>> diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c
>> index b45cb77c0744..a464636675a6 100644
>> --- a/drivers/usb/misc/usb3503.c
>> +++ b/drivers/usb/misc/usb3503.c
>> @@ -330,6 +330,19 @@ static int usb3503_i2c_probe(struct i2c_client *i2c,
>>  	return usb3503_probe(hub);
>>  }
>>  
>> +static int usb3503_i2c_remove(struct i2c_client *i2c)
>> +{
>> +	struct usb3503 *hub;
>> +
>> +	hub = i2c_get_clientdata(i2c);
>> +	if (hub) {
>> +		if (hub->clk)
>> +			clk_disable_unprepare(hub->clk);
>> +	}
> 
> I think the following is simpler and easier to read:
> 
> if (hub && hub->clk)
> 	clk_disable_unprepare(hub->clk);
> 

Sure, thanks.

Best regards,
Krzysztof

>> +
>> +	return 0;
>> +}
>> +
>>  static int usb3503_platform_probe(struct platform_device *pdev)
>>  {
>>  	struct usb3503 *hub;
>> @@ -342,6 +355,19 @@ static int usb3503_platform_probe(struct platform_device *pdev)
>>  	return usb3503_probe(hub);
>>  }
>>  
>> +static int usb3503_platform_remove(struct platform_device *pdev)
>> +{
>> +	struct usb3503 *hub;
>> +
>> +	hub = platform_get_drvdata(pdev);
>> +	if (hub) {
>> +		if (hub->clk)
>> +			clk_disable_unprepare(hub->clk);
>> +	}
>> +
> 
> Ditto.
> 
>> +	return 0;
>> +}
>> +
>>  #ifdef CONFIG_PM_SLEEP
>>  static int usb3503_i2c_suspend(struct device *dev)
>>  {
>> @@ -395,6 +421,7 @@ static struct i2c_driver usb3503_i2c_driver = {
>>  		.of_match_table = of_match_ptr(usb3503_of_match),
>>  	},
>>  	.probe		= usb3503_i2c_probe,
>> +	.remove		= usb3503_i2c_remove,
>>  	.id_table	= usb3503_id,
>>  };
>>  
>> @@ -404,6 +431,7 @@ static struct platform_driver usb3503_platform_driver = {
>>  		.of_match_table = of_match_ptr(usb3503_of_match),
>>  	},
>>  	.probe		= usb3503_platform_probe,
>> +	.remove		= usb3503_platform_remove,
>>  };
>>  
>>  static int __init usb3503_init(void)
>>
> 
> Reviewed-by: Javier Martinez Canillas <javier@....samsung.com>
> 
> Best regards,
>