linux-kernel - Re: [PATCH] ALSA: hda: fix SND_INTEL_DSP

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Date:   Mon, 04 Jan 2021 15:09:24 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        sound-open-firmware@...a-project.org
Subject: Re: [PATCH] ALSA: hda: fix SND_INTEL_DSP_CONFIG dependency

On Sun, 03 Jan 2021 14:52:32 +0100,
Arnd Bergmann wrote:
> 
> From: Arnd Bergmann <arnd@...db.de>
> 
> The sof-pci-dev driver fails to link when built into the kernel
> and CONFIG_SND_INTEL_DSP_CONFIG is set to =m:
> 
> arm-linux-gnueabi-ld: sound/soc/sof/sof-pci-dev.o: in function `sof_pci_probe':
> sof-pci-dev.c:(.text+0x1c): undefined reference to `snd_intel_dsp_driver_probe'
> 
> All other drivers using this interface already use a 'select
> SND_INTEL_DSP_CONFIG' statement to force the it to be present, so it
> seems reasonable to do the same here.
> 
> The stub implementation in the header makes the problem harder to find,
> as it avoids the link error when SND_INTEL_DSP_CONFIG is completely
> disabled, without any obvious upsides. Remove these stubs to make it
> clearer that the driver is in fact needed here.
> 
> Fixes: 82d9d54a6c0e ("ALSA: hda: add Intel DSP configuration / probe code")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

IMO, the problem is rather the unconditional calls of
snd_intel_dsp_driver_probe() in snd-soc-sof-pci and snd-soc-sof-acpi
drivers.  Those calls should be done only if Intel drivers are
involved.  So, wrapping the call with ifdef
CONFIG_SND_SOC_SOF_INTEL_PCI or CONFIG_SND_SOC_SOF_INTEL_ACPI would
work better (although those are a bit uglier).


thanks,

Takashi

> ---
>  include/sound/intel-dsp-config.h | 17 -----------------
>  sound/soc/sof/Kconfig            |  2 ++
>  2 files changed, 2 insertions(+), 17 deletions(-)
> 
> diff --git a/include/sound/intel-dsp-config.h b/include/sound/intel-dsp-config.h
> index d4609077c258..94667e870029 100644
> --- a/include/sound/intel-dsp-config.h
> +++ b/include/sound/intel-dsp-config.h
> @@ -18,24 +18,7 @@ enum {
>  	SND_INTEL_DSP_DRIVER_LAST = SND_INTEL_DSP_DRIVER_SOF
>  };
>  
> -#if IS_ENABLED(CONFIG_SND_INTEL_DSP_CONFIG)
> -
>  int snd_intel_dsp_driver_probe(struct pci_dev *pci);
>  int snd_intel_acpi_dsp_driver_probe(struct device *dev, const u8 acpi_hid[ACPI_ID_LEN]);
>  
> -#else
> -
> -static inline int snd_intel_dsp_driver_probe(struct pci_dev *pci)
> -{
> -	return SND_INTEL_DSP_DRIVER_ANY;
> -}
> -
> -static inline
> -int snd_intel_acpi_dsp_driver_probe(struct device *dev, const u8 acpi_hid[ACPI_ID_LEN])
> -{
> -	return SND_INTEL_DSP_DRIVER_ANY;
> -}
> -
> -#endif
> -
>  #endif
> diff --git a/sound/soc/sof/Kconfig b/sound/soc/sof/Kconfig
> index 031dad5fc4c7..051fd3d27047 100644
> --- a/sound/soc/sof/Kconfig
> +++ b/sound/soc/sof/Kconfig
> @@ -12,6 +12,7 @@ if SND_SOC_SOF_TOPLEVEL
>  config SND_SOC_SOF_PCI
>  	tristate "SOF PCI enumeration support"
>  	depends on PCI
> +	select SND_INTEL_DSP_CONFIG
>  	select SND_SOC_SOF
>  	select SND_SOC_ACPI if ACPI
>  	help
> @@ -23,6 +24,7 @@ config SND_SOC_SOF_PCI
>  config SND_SOC_SOF_ACPI
>  	tristate "SOF ACPI enumeration support"
>  	depends on ACPI || COMPILE_TEST
> +	select SND_INTEL_DSP_CONFIG
>  	select SND_SOC_SOF
>  	select SND_SOC_ACPI if ACPI
>  	select IOSF_MBI if X86 && PCI
> -- 
> 2.29.2
>