linux-kernel - Re: [PATCH 20/22] watchdog: jz4740_wdt: Use 'dev' instead of dereferencing it repeatedly

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Date:   Wed, 10 Apr 2019 09:52:09 -0700
From:   Joe Perches <joe@...ches.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 20/22] watchdog: jz4740_wdt: Use 'dev' instead of
 dereferencing it repeatedly

On Wed, 2019-04-10 at 09:28 -0700, Guenter Roeck wrote:
> Introduce local variable 'struct device *dev' and use it instead of
> dereferencing it repeatedly. Also, there is no call to dev_get_drvdata()
> or platform_get_drvdata() in the driver, so drop the unnecessary
> call to platform_set_drvdata().

Dropping platform_set_drvdata seems to me like it should
be a separate patch.

And are you sure no other function uses a get_drvdata call?
Maybe something in watchdog_dev.c?  Possibly:

   #ifdef CONFIG_WATCHDOG_SYSFS
   static ssize_t nowayout_show(struct device *dev, struct device_attribute *attr,
   				char *buf)
   {
   	struct watchdog_device *wdd = dev_get_drvdata(dev);

   	return sprintf(buf, "%d\n", !!test_bit(WDOG_NO_WAY_OUT, &wdd->status));
   }
   static DEVICE_ATTR_RO(nowayout);

> diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c
[]
> @@ -189,18 +190,16 @@ static int jz4740_wdt_probe(struct platform_device *pdev)
[]
> -	platform_set_drvdata(pdev, drvdata);
> -
>  	return 0;
>  }
>