linux-kernel - Re: [PATCH 10/16] ASoC: codecs: rx-macro: fix tlv min max range

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Message-ID: <YhUlxX461J9bskg3@sirena.org.uk>
Date:   Tue, 22 Feb 2022 18:04:53 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        pierre-louis.bossart@...ux.intel.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, quic_srivasam@...cinc.com
Subject: Re: [PATCH 10/16] ASoC: codecs: rx-macro: fix tlv min max range

On Tue, Feb 22, 2022 at 11:59:27AM +0000, Srinivas Kandagatla wrote:
> on Qualcomm codecs gain tlv control specifies min max range as both
> negative to positive numbers like
> 
> SOC_SINGLE_S8_TLV("... Volume", ..,  -84, 40, gain)
> 
> However with recent boundary checks added in commit 817f7c9335ec0
> ("ASoC: ops: Reject out of bounds values in snd_soc_put_volsw())
> setting a value above 40 gain will fail.
> 
> So fix this min max range correctly to
> SOC_SINGLE_S8_TLV("... Volume", ..,  0, 124, gain)
> so that users can now set gain correctly

Are you sure this isn't a bug in the core?  -84..40 should be a valid
range for a signed control.  See Marek's fix in 9bdd10d57a ("ASoC: ops:
Shift tested values in snd_soc_put_volsw() by +min") though that only
kicks in for systems with a platform_max.  I can't immediately spot any
other issues for S8 but I could be missing something.

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