Re: [PATCH v3 1/2] usb: dwc3: make dwc3_debugfs_init return value be void

[Felipe Balbi]

Hi,

changbin...@intel.com writes:
> diff --git a/drivers/usb/dwc3/debug.h b/drivers/usb/dwc3/debug.h
> index 07fbc2d..71e3180 100644
> --- a/drivers/usb/dwc3/debug.h
> +++ b/drivers/usb/dwc3/debug.h
> @@ -217,11 +217,11 @@ static inline const char 
> *dwc3_gadget_event_type_string(u8 event)
>  void dwc3_trace(void (*trace)(struct va_format *), const char *fmt, ...);
>  
>  #ifdef CONFIG_DEBUG_FS
> -extern int dwc3_debugfs_init(struct dwc3 *);
> +extern void dwc3_debugfs_init(struct dwc3 *);
>  extern void dwc3_debugfs_exit(struct dwc3 *);
>  #else
> -static inline int dwc3_debugfs_init(struct dwc3 *d)
> -{  return 0;  }
> +static inline void dwc3_debugfs_init(struct dwc3 *d)
> +{  }
>  static inline void dwc3_debugfs_exit(struct dwc3 *d)
>  {  }
>  #endif
> diff --git a/drivers/usb/dwc3/debugfs.c b/drivers/usb/dwc3/debugfs.c
> index 9ac37fe..071b286 100644
> --- a/drivers/usb/dwc3/debugfs.c
> +++ b/drivers/usb/dwc3/debugfs.c
> @@ -618,69 +618,39 @@ static const struct file_operations 
> dwc3_link_state_fops = {
>       .release                = single_release,
>  };
>  
> -int dwc3_debugfs_init(struct dwc3 *dwc)
> +void dwc3_debugfs_init(struct dwc3 *dwc)
>  {
>       struct dentry           *root;
> -     struct dentry           *file;
> -     int                     ret;
>  
>       root = debugfs_create_dir(dev_name(dwc->dev), NULL);
> -     if (!root) {
> -             ret = -ENOMEM;
> -             goto err0;
> -     }
> +     if (IS_ERR_OR_NULL(root))
> +             return;

We can definitely keep on going, but I'd still like to know that we
enabled CONFIG_DEBUG_FS but failed to create a file or a
directory. Seems like this should read as follows:

        if (IS_ERR_OR_NULL(root)) {
                if (!root)
                        dev_err(dwc->dev, "Can't create debugfs root\n");
                return;
        }

ditto to all bellow.

>       dwc->root = root;
>  
>       dwc->regset = kzalloc(sizeof(*dwc->regset), GFP_KERNEL);
>       if (!dwc->regset) {
> -             ret = -ENOMEM;
> -             goto err1;
> +             debugfs_remove_recursive(root);

you're now duplicating debugfs_remove_recursive(root) in all braches and
that's error prone. It's probably better to keep our gotos, but change
them so they read as follows:

        if (!dwc->regset)
                goto err1;

        [...]

        return; /* this is our successful exit point */

err1:
        debugfs_remove_recursive(root);
        kfree(dwc->regset);


-- 
balbi

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