linux-kernel - Re: [PATCH] bluetooth: hci_h5: avoid unused variable warnings

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Date:   Mon, 13 Aug 2018 15:36:28 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Jeremy Cline <jeremy@...ine.org>,
        linux-bluetooth@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bluetooth: hci_h5: avoid unused variable warnings

On Mon, Aug 13, 2018 at 3:04 PM, Arnd Bergmann <arnd@...db.de> wrote:
> When CONFIG_BT_HCIUART_RTL is disabled, the hci_h5 driver produces a build
> warning because of an incorrect set of #ifdef guards:
>
> drivers/bluetooth/hci_h5.c:920:22: error: 'rtl_vnd' defined but not used [-Werror=unused-variable]
>
> Replacing the #ifdef with an IS_ENABLED() check shuts up the error
> and simplifies the logic.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  drivers/bluetooth/hci_h5.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
> index 8eede1197cd2..b10e64ba0ff4 100644
> --- a/drivers/bluetooth/hci_h5.c
> +++ b/drivers/bluetooth/hci_h5.c
> @@ -841,7 +841,6 @@ static void h5_serdev_remove(struct serdev_device *serdev)
>         hci_uart_unregister_device(&h5->serdev_hu);
>  }
>
> -#ifdef CONFIG_BT_HCIUART_RTL
>  static int h5_btrtl_setup(struct h5 *h5)
>  {
>         struct btrtl_device_info *btrtl_dev;
> @@ -923,24 +922,21 @@ static struct h5_vnd rtl_vnd = {
>         .close          = h5_btrtl_close,
>         .acpi_gpio_map  = acpi_btrtl_gpios,
>  };
> -#endif
>
> -#ifdef CONFIG_ACPI
>  static const struct acpi_device_id h5_acpi_match[] = {
> -#ifdef CONFIG_BT_HCIUART_RTL
>         { "OBDA8723", (kernel_ulong_t)&rtl_vnd },
> -#endif
>         { },
>  };
>  MODULE_DEVICE_TABLE(acpi, h5_acpi_match);
> -#endif
>
>  static struct serdev_device_driver h5_serdev_driver = {
>         .probe = h5_serdev_probe,
>         .remove = h5_serdev_remove,
>         .driver = {
>                 .name = "hci_uart_h5",
> -               .acpi_match_table = ACPI_PTR(h5_acpi_match),
> +               .acpi_match_table = (IS_ENABLED(CONFIG_BT_HCIUART_RTL) &&
> +                                    IS_ENABLED(CONFIG_ACPI)) ?
> +                                       h5_acpi_match : 0,
>         },
>  };
>
> --
> 2.18.0
>



-- 
Kees Cook
Pixel Security