linux-kernel - Re: [PATCH] ASoC: wcd934x: Remove some unnecessary NULL checks

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Message-ID: <20200204100039.GX3897@sirena.org.uk>
Date:   Tue, 4 Feb 2020 10:00:39 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] ASoC: wcd934x: Remove some unnecessary NULL checks

On Mon, Feb 03, 2020 at 11:01:44PM -0700, Nathan Chancellor wrote:
> Clang warns:
> 
> ../sound/soc/codecs/wcd934x.c:1886:11: warning: address of array
> 'wcd->rx_chs' will always evaluate to 'true' [-Wpointer-bool-conversion]
>         if (wcd->rx_chs) {
>         ~~  ~~~~~^~~~~~
> ../sound/soc/codecs/wcd934x.c:1894:11: warning: address of array
> 'wcd->tx_chs' will always evaluate to 'true' [-Wpointer-bool-conversion]
>         if (wcd->tx_chs) {
>         ~~  ~~~~~^~~~~~
> 2 warnings generated.
> 
> Arrays that are in the middle of a struct are never NULL so they don't
> need a check like this.

I'm not convincd this is a sensible warning, at the use site a
pointer to an array in a struct looks identical to an array
embedded in the struct so it's not such a bad idea to check and
refactoring of the struct could easily introduce problems.

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