Re: [PATCH] Bluetooth: fix BT dependency for submodules

Hi Iva,

On Mon, Jul 20, 2026 at 11:09 AM Iva Kasprzaková <[email protected]> wrote:
>
> Rfcomm (BT_RFCOMM), bnep (BT_BNEP), and hidp (BT_HIDP) modules are
> dependent on the bluetooth module (BT, tristate) only transitively
> through the boolean BT_BREDR. Therefore, the modules can be selected as
> built-in even if the BT=m. The combination of BT=m and =y for the said
> modules leads to the kernel build system silently ignoring those
> modules, without ever compiling them as built-in or as loadable modules.
>
> Add BT as a direct dependency to Kconfig of rfcomm, bnep and hidp. The
> modules set to =y when BT=m will default to =m, rather then getting
> silently ignored by the build system.
>
> Signed-off-by: Iva Kasprzaková <[email protected]>
> ---
>  net/bluetooth/bnep/Kconfig   | 2 +-
>  net/bluetooth/hidp/Kconfig   | 2 +-
>  net/bluetooth/rfcomm/Kconfig | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/net/bluetooth/bnep/Kconfig b/net/bluetooth/bnep/Kconfig
> index aac02b5b0d17..f8087e2d2c00 100644
> --- a/net/bluetooth/bnep/Kconfig
> +++ b/net/bluetooth/bnep/Kconfig
> @@ -1,7 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  config BT_BNEP
>         tristate "BNEP protocol support"
> -       depends on BT_BREDR
> +       depends on BT && BT_BREDR
>         select CRC32
>         help
>           BNEP (Bluetooth Network Encapsulation Protocol) is Ethernet
> diff --git a/net/bluetooth/hidp/Kconfig b/net/bluetooth/hidp/Kconfig
> index e08aae35351a..ba52c7296f18 100644
> --- a/net/bluetooth/hidp/Kconfig
> +++ b/net/bluetooth/hidp/Kconfig
> @@ -1,7 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  config BT_HIDP
>         tristate "HIDP protocol support"
> -       depends on BT_BREDR && HID
> +       depends on BT && BT_BREDR && HID
>         help
>           HIDP (Human Interface Device Protocol) is a transport layer
>           for HID reports.  HIDP is required for the Bluetooth Human
> diff --git a/net/bluetooth/rfcomm/Kconfig b/net/bluetooth/rfcomm/Kconfig
> index 9b9953ebf4c0..e7af2d565cea 100644
> --- a/net/bluetooth/rfcomm/Kconfig
> +++ b/net/bluetooth/rfcomm/Kconfig
> @@ -1,7 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  config BT_RFCOMM
>         tristate "RFCOMM protocol support"
> -       depends on BT_BREDR
> +       depends on BT && BT_BREDR
>         help
>           RFCOMM provides connection oriented stream transport.  RFCOMM
>           support is required for Dialup Networking, OBEX and other Bluetooth
>
> base-commit: c1cec2bbbeb5922d42d28c6af1707c4f3f8647e3
> --
> 2.55.0

Looks like BT_6LOWPAN could also use the same logic:

https://sashiko.dev/#/patchset/20260720150919.9602-1-iva%40yenya.net

-- 
Luiz Augusto von Dentz