linux-kernel - Re: [PATCH] ALSA: hda: intel-sdw-acpi: Use u8 type for link index

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Date:   Wed, 13 Sep 2023 09:43:34 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>
Cc:     tiwai@...e.com, perex@...ex.cz, arnd@...db.de,
        masahiroy@...nel.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, pierre-louis.bossart@...ux.intel.com
Subject: Re: [PATCH] ALSA: hda: intel-sdw-acpi: Use u8 type for link index

On Tue, 12 Sep 2023 18:26:17 +0200,
Peter Ujfalusi wrote:
> 
> Use consistently u8 for sdw link index. The id is limited to 4, u8 is
> adequate in size to store it.
> 
> This change will also fixes the following compiler warning/error (W=1):
> 
> sound/hda/intel-sdw-acpi.c: In function ‘sdw_intel_acpi_scan’:
> sound/hda/intel-sdw-acpi.c:34:35: error: ‘-subproperties’ directive output may be truncated writing 14 bytes into a region of size between 7 and 17 [-Werror=format-truncation=]
>    34 |                  "mipi-sdw-link-%d-subproperties", i);
>       |                                   ^~~~~~~~~~~~~~
> In function ‘is_link_enabled’,
>     inlined from ‘sdw_intel_scan_controller’ at sound/hda/intel-sdw-acpi.c:106:8,
>     inlined from ‘sdw_intel_acpi_scan’ at sound/hda/intel-sdw-acpi.c:180:9:
> sound/hda/intel-sdw-acpi.c:33:9: note: ‘snprintf’ output between 30 and 40 bytes into a destination of size 32
>    33 |         snprintf(name, sizeof(name),
>       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    34 |                  "mipi-sdw-link-%d-subproperties", i);
>       |                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
> 
> The warnings got brought to light by a recent patch upstream:
> commit 6d4ab2e97dcf ("extrawarn: enable format and stringop overflow warnings in W=1")
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>

Thanks, applied now.


Takashi