[PATCH] i915: no need to check return value of debugfs_create functions

[PATCH] i915: 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: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 5823ffb17821..bd5cf8ec254d 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4648,23 +4648,17 @@ static const struct i915_debugfs_files {
 int i915_debugfs_register(struct drm_i915_private *dev_priv)
 {
 	struct drm_minor *minor = dev_priv->drm.primary;
-	struct dentry *ent;
 	int i;
 
-	ent = debugfs_create_file("i915_forcewake_user", S_IRUSR,
-				  minor->debugfs_root, to_i915(minor->dev),
-				  &i915_forcewake_fops);
-	if (!ent)
-		return -ENOMEM;
+	debugfs_create_file("i915_forcewake_user", S_IRUSR, minor->debugfs_root,
+			    to_i915(minor->dev), &i915_forcewake_fops);
 
 	for (i = 0; i < ARRAY_SIZE(i915_debugfs_files); i++) {
-		ent = debugfs_create_file(i915_debugfs_files[i].name,
-					  S_IRUGO | S_IWUSR,
-					  minor->debugfs_root,
-					  to_i915(minor->dev),
-					  i915_debugfs_files[i].fops);
-		if (!ent)
-			return -ENOMEM;
+		debugfs_create_file(i915_debugfs_files[i].name,
+				    S_IRUGO | S_IWUSR,
+				    minor->debugfs_root,
+				    to_i915(minor->dev),
+				    i915_debugfs_files[i].fops);
 	}
 
 	return drm_debugfs_create_files(i915_debugfs_list,
-- 
2.22.0

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Re: [PATCH] i915: no need to check return value of debugfs_create functions

[Jani Nikula]

On Thu, 13 Jun 2019, Greg Kroah-Hartman <gregkh@linuxfoundation.org> 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: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: intel-gfx@lists.freedesktop.org
> Cc: dri-devel@lists.freedesktop.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Thanks, looks good, but for some reason this was not picked up by our
CI. I resent it with hopes we'll get some test results too.

BR,
Jani.


> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 20 +++++++-------------
>  1 file changed, 7 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 5823ffb17821..bd5cf8ec254d 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -4648,23 +4648,17 @@ static const struct i915_debugfs_files {
>  int i915_debugfs_register(struct drm_i915_private *dev_priv)
>  {
>  	struct drm_minor *minor = dev_priv->drm.primary;
> -	struct dentry *ent;
>  	int i;
>  
> -	ent = debugfs_create_file("i915_forcewake_user", S_IRUSR,
> -				  minor->debugfs_root, to_i915(minor->dev),
> -				  &i915_forcewake_fops);
> -	if (!ent)
> -		return -ENOMEM;
> +	debugfs_create_file("i915_forcewake_user", S_IRUSR, minor->debugfs_root,
> +			    to_i915(minor->dev), &i915_forcewake_fops);
>  
>  	for (i = 0; i < ARRAY_SIZE(i915_debugfs_files); i++) {
> -		ent = debugfs_create_file(i915_debugfs_files[i].name,
> -					  S_IRUGO | S_IWUSR,
> -					  minor->debugfs_root,
> -					  to_i915(minor->dev),
> -					  i915_debugfs_files[i].fops);
> -		if (!ent)
> -			return -ENOMEM;
> +		debugfs_create_file(i915_debugfs_files[i].name,
> +				    S_IRUGO | S_IWUSR,
> +				    minor->debugfs_root,
> +				    to_i915(minor->dev),
> +				    i915_debugfs_files[i].fops);
>  	}
>  
>  	return drm_debugfs_create_files(i915_debugfs_list,

-- 
Jani Nikula, Intel Open Source Graphics Center
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