linux-kernel - Re: [PATCH] spi: rockchip: avoid objtool warning

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Date:   Fri, 26 Feb 2021 12:15:44 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Pratyush Yadav <p.yadav@...com>
Cc:     Mark Brown <broonie@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Arnd Bergmann <arnd@...db.de>,
        Jon Lin <jon.lin@...k-chips.com>,
        Chris Ruehl <chris.ruehl@...ys.com.hk>,
        Alexander Kochetkov <al.kochet@...il.com>,
        Johan Jonker <jbx6244@...il.com>,
        Vincent Pelletier <plr.vincent@...il.com>,
        linux-spi <linux-spi@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC support" 
        <linux-rockchip@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] spi: rockchip: avoid objtool warning

On Fri, Feb 26, 2021 at 12:05 PM 'Pratyush Yadav' via Clang Built
Linux <clang-built-linux@...glegroups.com> wrote:
> On 26/02/21 10:49AM, Arnd Bergmann wrote:
> > On Fri, Feb 26, 2021 at 9:16 AM 'Pratyush Yadav' via Clang Built Linux <clang-built-linux@...glegroups.com> wrote:

>
> Returning an error code from this function (along with the dev_warn() or
> WARN_ON()) is the most sensible thing to do IMO. If the SPI layer sends
> an invalid value then the driver should be well within its rights to
> refuse the transaction. The function is currently void but making it
> return int seems fairly straightforward.

Indeed, this seems like a clear -EINVAL case. I've updated my patch, will
send after build testing.

       Arnd