linux-kernel - Re: Fwd: [PATCH 2/8] watchdog: davinci: use davinci_wdt

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Date:	Tue, 12 Nov 2013 11:28:54 -0500
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	"ivan.khoronzhuk" <ivan.khoronzhuk@...com>, <wim@...ana.be>,
	<nsekhar@...com>, <linux-watchdog@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <grant.likely@...aro.org>,
	<rob.herring@...xeda.com>, <pawel.moll@....com>,
	<mark.rutland@....com>, <swarren@...dotorg.org>,
	<galak@...nel.crashing.org>, <ijc+devicetree@...lion.org.uk>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Fwd: [PATCH 2/8] watchdog: davinci: use davinci_wdt_device structure
 to hold device data

On Tuesday 12 November 2013 11:27 AM, Guenter Roeck wrote:
> On Tue, Nov 12, 2013 at 10:37:04AM -0500, Santosh Shilimkar wrote:
>> On Wednesday 06 November 2013 06:31 AM, ivan.khoronzhuk wrote:
>>> Some SoCs, like Keystone 2, can support more than one WDT and each
>>> watchdog device has to use it's own base address, clock source,
>>> wdd device, so add new davinci_wdt_device structure to hold device
>> In commit avoid struct names ;)
>> s/wdd/watchdog device
>>> data.
>>>
>>> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...com>
>>> ---
>>>  drivers/watchdog/davinci_wdt.c |   74 ++++++++++++++++++++++++++--------------
>>>  1 file changed, 48 insertions(+), 26 deletions(-)
>>>
>>> diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
>>> index a6eef71..1fc2093 100644
>>> --- a/drivers/watchdog/davinci_wdt.c
>>> +++ b/drivers/watchdog/davinci_wdt.c
>>
>> [...]
>>
>>> @@ -123,14 +135,21 @@ static int davinci_wdt_probe(struct platform_device *pdev)
>>>  	struct device *dev = &pdev->dev;
>>>  	struct resource  *wdt_mem;
>>>  	struct watchdog_device *wdd;
>>> +	struct davinci_wdt_device *davinci_wdt;
>>> +
>>> +	davinci_wdt = devm_kzalloc(dev, sizeof(*davinci_wdt), GFP_KERNEL);
>>> +	if (!davinci_wdt)
>>> +		return -ENOMEM;
>>>  
>>> -	wdt_clk = devm_clk_get(dev, NULL);
>>> -	if (WARN_ON(IS_ERR(wdt_clk)))
>>> -		return PTR_ERR(wdt_clk);
>>> +	davinci_wdt->clk = devm_clk_get(dev, NULL);
>>> +	if (WARN_ON(IS_ERR(davinci_wdt->clk)))
>>> +		return PTR_ERR(davinci_wdt->clk);
>>>  
>>> -	clk_prepare_enable(wdt_clk);
>>> +	clk_prepare_enable(davinci_wdt->clk);
>>>  
>>> -	wdd			= &wdt_wdd;
>>> +	platform_set_drvdata(pdev, davinci_wdt);
>>> +
>>> +	wdd			= &davinci_wdt->wdd;
>>>  	wdd->info		= &davinci_wdt_info;
>>>  	wdd->ops		= &davinci_wdt_ops;
>>>  	wdd->min_timeout 	= 1;
>>> @@ -142,12 +161,13 @@ static int davinci_wdt_probe(struct platform_device *pdev)
>>>  
>>>  	dev_info(dev, "heartbeat %d sec\n", wdd->timeout);
>>>  
>>> +	watchdog_set_drvdata(wdd, davinci_wdt);
>>>  	watchdog_set_nowayout(wdd, WATCHDOG_NOWAYOUT);
>>>  
>>>  	wdt_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> -	wdt_base = devm_ioremap_resource(dev, wdt_mem);
>>> -	if (IS_ERR(wdt_base))
>>> -		return PTR_ERR(wdt_base);
>>> +	davinci_wdt->base = devm_ioremap_resource(dev, wdt_mem);
>>> +	if (IS_ERR(davinci_wdt->base))
>>> +		return PTR_ERR(davinci_wdt->base);
>> You should free up davinci_wdt memory before returning, right ?
>>
> No, devm should take care of that.
> 
You are right. I didn't pay attention about the devm_*() usage.

Regards,
Santosh

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