[PATCH] watchdog: bcm_kona_wdt: no need to check return value of debugfs_create functions

[PATCH] watchdog: bcm_kona_wdt: no need to check return value of debugfs_create functions

[Greg Kroah-Hartman]

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ray Jui <rjui@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Cc: bcm-kernel-feedback-list@broadcom.com
Cc: linux-watchdog@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/watchdog/bcm_kona_wdt.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/drivers/watchdog/bcm_kona_wdt.c b/drivers/watchdog/bcm_kona_wdt.c
index e2ad44816359..921291025680 100644
--- a/drivers/watchdog/bcm_kona_wdt.c
+++ b/drivers/watchdog/bcm_kona_wdt.c
@@ -143,24 +143,18 @@ static void bcm_kona_wdt_debug_init(struct platform_device *pdev)
 	wdt->debugfs = NULL;
 
 	dir = debugfs_create_dir(BCM_KONA_WDT_NAME, NULL);
-	if (IS_ERR_OR_NULL(dir))
-		return;
 
-	if (debugfs_create_file("info", S_IFREG | S_IRUGO, dir, wdt,
-				&bcm_kona_fops))
-		wdt->debugfs = dir;
-	else
-		debugfs_remove_recursive(dir);
+	debugfs_create_file("info", S_IFREG | S_IRUGO, dir, wdt,
+			    &bcm_kona_fops);
+	wdt->debugfs = dir;
 }
 
 static void bcm_kona_wdt_debug_exit(struct platform_device *pdev)
 {
 	struct bcm_kona_wdt *wdt = platform_get_drvdata(pdev);
 
-	if (wdt && wdt->debugfs) {
+	if (wdt)
 		debugfs_remove_recursive(wdt->debugfs);
-		wdt->debugfs = NULL;
-	}
 }
 
 #else
-- 
2.22.0

Re: [PATCH] watchdog: bcm_kona_wdt: no need to check return value of debugfs_create functions

[Guenter Roeck]

On Tue, Jun 18, 2019 at 05:58:09PM +0200, Greg Kroah-Hartman wrote:
> When calling debugfs functions, there is no need to ever check the
> return value.  The function can work or not, but the code logic should
> never do something different based on this.
> 
> Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
> Cc: Guenter Roeck <linux@roeck-us.net>
> Cc: Florian Fainelli <f.fainelli@gmail.com>
> Cc: Ray Jui <rjui@broadcom.com>
> Cc: Scott Branden <sbranden@broadcom.com>
> Cc: bcm-kernel-feedback-list@broadcom.com
> Cc: linux-watchdog@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  drivers/watchdog/bcm_kona_wdt.c | 14 ++++----------
>  1 file changed, 4 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/watchdog/bcm_kona_wdt.c b/drivers/watchdog/bcm_kona_wdt.c
> index e2ad44816359..921291025680 100644
> --- a/drivers/watchdog/bcm_kona_wdt.c
> +++ b/drivers/watchdog/bcm_kona_wdt.c
> @@ -143,24 +143,18 @@ static void bcm_kona_wdt_debug_init(struct platform_device *pdev)
>  	wdt->debugfs = NULL;
>  
>  	dir = debugfs_create_dir(BCM_KONA_WDT_NAME, NULL);
> -	if (IS_ERR_OR_NULL(dir))
> -		return;
>  
> -	if (debugfs_create_file("info", S_IFREG | S_IRUGO, dir, wdt,
> -				&bcm_kona_fops))
> -		wdt->debugfs = dir;
> -	else
> -		debugfs_remove_recursive(dir);
> +	debugfs_create_file("info", S_IFREG | S_IRUGO, dir, wdt,
> +			    &bcm_kona_fops);
> +	wdt->debugfs = dir;
>  }
>  
>  static void bcm_kona_wdt_debug_exit(struct platform_device *pdev)
>  {
>  	struct bcm_kona_wdt *wdt = platform_get_drvdata(pdev);
>  
> -	if (wdt && wdt->debugfs) {
> +	if (wdt)
>  		debugfs_remove_recursive(wdt->debugfs);
> -		wdt->debugfs = NULL;
> -	}
>  }
>  
>  #else
> -- 
> 2.22.0
>