Re: [PATCH v2] staging: r8188eu: replace rtw_netdev_priv define with inline function

[Joe Perches]

On Sat, 2020-08-01 at 19:52 +0300, Ivan Safonov wrote:
> The function guarantees type checking of arguments and return value.
> 
> Result of rtw_netdev_priv macro can be assigned to pointer
> with incompatible type without warning. The function allow compiler
> to perform this check.
[]
> diff --git a/drivers/staging/rtl8188eu/include/osdep_service.h 
> b/drivers/staging/rtl8188eu/include/osdep_service.h
[]
> @@ -71,8 +71,11 @@ struct rtw_netdev_priv_indicator {
>  };
>  struct net_device *rtw_alloc_etherdev_with_old_priv(void *old_priv);
>  
> -#define rtw_netdev_priv(netdev)                                      \
> -     (((struct rtw_netdev_priv_indicator *)netdev_priv(netdev))->priv)
> +static inline struct adapter *rtw_netdev_priv(struct net_device *dev)
> +{
> +     return (((struct rtw_netdev_priv_indicator *)netdev_priv(dev))->priv);
> +}

To be similar to existing uses, this variable name should be
netdev not dev.  There are also unnecessary parentheses.

>  void rtw_free_netdev(struct net_device *netdev);

Better to use netdev like this one.

---
static inline struct adapter *rtw_netdev_priv(struct net_device *netdev)
{
        return ((struct rtw_netdev_priv_indicator *)netdev_priv(netdev))->priv;
}