Re: [PATCH] Input: i8042 add of_node_put()

[Dmitry Torokhov]

Hi Yangtao,

On Wed, Nov 21, 2018 at 09:35:13AM -0500, Yangtao Li wrote:
> use of_node_put() to release the refcount.
> 
> Signed-off-by: Yangtao Li <tiny.win...@gmail.com>
> ---
>  drivers/input/serio/i8042-sparcio.h | 24 +++++++++++++++++-------
>  1 file changed, 17 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/input/serio/i8042-sparcio.h 
> b/drivers/input/serio/i8042-sparcio.h
> index 796289846204..5495bc035518 100644
> --- a/drivers/input/serio/i8042-sparcio.h
> +++ b/drivers/input/serio/i8042-sparcio.h
> @@ -108,18 +108,21 @@ static struct platform_driver sparc_i8042_driver = {
>  
>  static int __init i8042_platform_init(void)
>  {
> +     int rc;
>       struct device_node *root = of_find_node_by_path("/");
>  
>       if (!strcmp(root->name, "SUNW,JavaStation-1")) {
>               /* Hardcoded values for MrCoffee.  */
>               i8042_kbd_irq = i8042_aux_irq = 13 | 0x20;
>               kbd_iobase = ioremap(0x71300060, 8);
> -             if (!kbd_iobase)
> -                     return -ENODEV;
> +             if (!kbd_iobase){
> +                     rc = -ENODEV;
> +                     goto out;
> +             }
>       } else {
> -             int err = platform_driver_register(&sparc_i8042_driver);
> -             if (err)
> -                     return err;
> +             rc = platform_driver_register(&sparc_i8042_driver);
> +             if (rc)
> +                     goto out;
>  
>               if (i8042_kbd_irq == -1 ||
>                   i8042_aux_irq == -1) {
> @@ -127,13 +130,18 @@ static int __init i8042_platform_init(void)
>                               of_iounmap(kbd_res, kbd_iobase, 8);
>                               kbd_iobase = (void __iomem *) NULL;
>                       }
> -                     return -ENODEV;
> +                     rc = -ENODEV;
> +                     goto out;
>               }
>       }
>  
>       i8042_reset = I8042_RESET_ALWAYS;
>  
> -     return 0;
> +     rc = 0;
> +out:
> +     of_node_put(root);
> +
> +     return rc;

Instead of rearranging code like this, can we instead have:

static inline bool i8042_is_mr_coffee(void)
{
        struct device_node *root;
        bool is_mr_coffree;

        root = of_find_node_by_path("/");
        is_mr_coffree = !strcmp(root->name, "SUNW,JavaStation-1");
        of_node_put(root);

        return is_mr_coffee;
}

?

Thanks.

-- 
Dmitry