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From: Guenter Roeck <linux@roeck-us.net>
To: Steve Twiss <stwiss.opensource@diasemi.com>,
	Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: "linux-watchdog@vger.kernel.org" <linux-watchdog@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Support Opensource <Support.Opensource@diasemi.com>
Subject: Re: [PATCH 12/22] watchdog: da9063_wdt: Use 'dev' instead of dereferencing it repeatedly
Date: Wed, 10 Apr 2019 06:11:17 -0700
Message-ID: <3fd0e7c8-acc5-8c94-3617-1cea8f8d9f20@roeck-us.net> (raw)
In-Reply-To: <VI1PR10MB235286F9A7E4E1C32DD41139FE2E0@VI1PR10MB2352.EURPRD10.PROD.OUTLOOK.COM>

Hi Steve,

On 4/10/19 5:50 AM, Steve Twiss wrote:
> Hi Guenter,
> 
> On 08 April 2019 20:39, Guenter Roeck:
> 
>> Subject: [PATCH 12/22] watchdog: da9063_wdt: Use 'dev' instead of
>> dereferencing it repeatedly
>>
>> Introduce local variable 'struct device *dev' and use it instead of
>> dereferencing it repeatedly.
>>
>> The conversion was done automatically with coccinelle using the
>> following semantic patches. The semantic patches and the scripts
>> used to generate this commit log are available at
>> https://github.com/groeck/coccinelle-patches
>>
>> Cc: Support Opensource <support.opensource@diasemi.com>
>> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
>> ---
>>   drivers/watchdog/da9063_wdt.c | 11 ++++++-----
>>   1 file changed, 6 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c
>> index 384dca16af8b..06eb9070203c 100644
>> --- a/drivers/watchdog/da9063_wdt.c
>> +++ b/drivers/watchdog/da9063_wdt.c
>> @@ -188,17 +188,18 @@ static const struct watchdog_ops
>> da9063_watchdog_ops = {
>>
>>   static int da9063_wdt_probe(struct platform_device *pdev)
>>   {
>> +	struct device *dev = &pdev->dev;
>>   	struct da9063 *da9063;
>>   	struct watchdog_device *wdd;
>>
>> -	if (!pdev->dev.parent)
>> +	if (!dev->parent)
>>   		return -EINVAL;
> 
> None of my previous Acked e-mails in this patch set considered whether the
> dev->parent was NULL. But this DA9063 driver does.
> 
> Logically, this is correct to check, but ... any thoughts?

The check is not really necessary. All da90xx drivers are instantiated from
mfd drivers and do provide a parent. Anyone changing that code or trying
to instantiate the drivers from some other place without providing a parent
really deserves the resulting crash (it would be a bug).

Either case, I don't think this warrants changing this driver to drop
the check, or changing the other drivers to add unnecessary checks
just to make the code consistent.

> Otherwise,
> 
> Acked-by: Steve Twiss <stwiss.opensource@diasemi.com>
> 

Thanks,
Guenter

  reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-08 19:38 [PATCH 00/22] watchdog: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-08 19:38 ` [PATCH 01/22] watchdog: armada_37xx_wdt: " Guenter Roeck
2019-04-08 19:38 ` [PATCH 02/22] watchdog: asm9260_wdt: " Guenter Roeck
2019-04-08 19:38 ` [PATCH 03/22] watchdog: aspeed_wdt: Use 'dev' instead of dereferencing it repeatedly Guenter Roeck
2019-04-09  0:37   ` Andrew Jeffery
2019-04-09  1:03     ` Guenter Roeck
2019-04-09  1:05       ` Andrew Jeffery
2019-04-08 19:38 ` [PATCH 04/22] watchdog: atlas7_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-08 19:38 ` [PATCH 05/22] watchdog: bcm2835_wdt: drop platform_set_drvdata Guenter Roeck
2019-04-09  6:54   ` Stefan Wahren
2019-04-08 19:38 ` [PATCH 06/22] watchdog: bcm7038_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-08 19:38 ` [PATCH 07/22] watchdog: bcm_kona_wdt: " Guenter Roeck
2019-04-09 16:36   ` Ray Jui
2019-04-08 19:38 ` [PATCH 08/22] watchdog: cadence_wdt: " Guenter Roeck
2019-04-08 19:38 ` [PATCH 09/22] watchdog: da9052_wdt: Use 'dev' instead of dereferencing it repeatedly Guenter Roeck
2019-04-10 12:12   ` Steve Twiss
2019-04-08 19:38 ` [PATCH 10/22] watchdog: da9055_wdt: " Guenter Roeck
2019-04-10 12:14   ` Steve Twiss
2019-04-08 19:38 ` [PATCH 11/22] watchdog: da9062_wdt: " Guenter Roeck
2019-04-10 12:20   ` Steve Twiss
2019-04-08 19:38 ` [PATCH 12/22] watchdog: da9063_wdt: " Guenter Roeck
2019-04-10 12:50   ` Steve Twiss
2019-04-10 13:11     ` Guenter Roeck [this message]
2019-04-08 19:38 ` [PATCH 13/22] watchdog: davinci_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-08 19:38 ` [PATCH 14/22] watchdog: ep93xx_wdt: Use 'dev' instead of dereferencing it repeatedly Guenter Roeck
2019-04-08 19:38 ` [PATCH 15/22] watchdog: ftwdt010_wdt: Use 'dev' consistently Guenter Roeck
2019-04-08 19:38 ` [PATCH 16/22] watchdog: gpio_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-08 19:38 ` [PATCH 17/22] watchdog: iTCO_wdt: Various improvements Guenter Roeck
2019-04-08 19:38 ` [PATCH 18/22] watchdog: imgpdc_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-08 19:38 ` [PATCH 19/22] watchdog: intel-mid_wdt: Use 'dev' instead of dereferencing it repeatedly Guenter Roeck
2019-04-08 19:38 ` [PATCH 20/22] watchdog: kempld_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-08 19:38 ` [PATCH 21/22] watchdog: lpc18xx_wdt: " Guenter Roeck
2019-04-08 19:38 ` [PATCH 22/22] watchdog: max63xx_wdt: " Guenter Roeck

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