linux-kernel - Re: [PATCH] spi: initialize ret variable

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Date:   Wed, 9 Feb 2022 17:04:36 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Tom Rix <trix@...hat.com>
Cc:     lhjeff911@...il.com, nathan@...nel.org, ndesaulniers@...gle.com,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] spi: initialize ret variable

On Wed, Feb 09, 2022 at 08:44:21AM -0800, Tom Rix wrote:
> On 2/9/22 8:33 AM, Mark Brown wrote:
> > On Wed, Feb 09, 2022 at 08:30:29AM -0800, trix@...hat.com wrote:

> > > Clang build fails with
> > > spi-sunplus-sp7021.c:405:2: error: variable 'ret' is used
> > >    uninitialized whenever switch default is taken
> > >          default:
> > >          ^~~~~~~

> > > Restore initializing ret.

> > Are you sure this is a good fix and that the compiler hasn't instead
> > identifed that we should be returning an error in the default case?

> If setting mode to idle is not really a valid state, then default should
> return an error.

Yes, that's what I'm asking.

> The old behavior returned 0 and I am treating this as a regression.

The goal here isn't just to shut up warnings, it's to fix any problems
that they identify.  Unconditionally initialising return values is a
common way of fixing warnings while leaving real problems in place.

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