linux-kernel - Re: [PATCH] ASoC: max98090: Remove unneeded check in max98090_put_enab

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Date:   Thu, 19 May 2022 18:54:37 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Alexey Khoroshilov <khoroshilov@...ras.ru>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH] ASoC: max98090: Remove unneeded check in
 max98090_put_enab_tlv()

On Thu, May 19, 2022 at 08:49:48PM +0300, Alexey Khoroshilov wrote:
> On 19.05.2022 20:29, Mark Brown wrote:
> > On Thu, May 19, 2022 at 08:10:12PM +0300, Alexey Khoroshilov wrote:

> >> -	if (sel < 0 || sel > mc->max)
> >> +	if (sel > mc->max)

> > The check needs to be moved, not removed.  The userspace ABI allows
> > passing in of negative values.

> Would (sel > mc->max) be enough in this case anyway?

Oh, the check won't be working properly - it's just that like I say the
fix is to move rather than remove it so it's operating on the signed
value.

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