linux-kernel - Re: [PATCH v4 32/47] serial: ucc_uart: use of_property_read_u32() in ucc_uart

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Message-ID: <CAOZdJXVpDSk2AWT7pYjrsk5HUmAeosCNf8zWX1CEEtZshAh9Sw@mail.gmail.com>
Date:   Thu, 14 Nov 2019 22:25:52 -0600
From:   Timur Tabi <timur@...nel.org>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        Christophe Leroy <christophe.leroy@....fr>,
        linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Scott Wood <oss@...error.net>, linux-serial@...r.kernel.org
Subject: Re: [PATCH v4 32/47] serial: ucc_uart: use of_property_read_u32() in ucc_uart_probe()

On Fri, Nov 8, 2019 at 7:03 AM Rasmus Villemoes
<linux@...musvillemoes.dk> wrote:
>
> +       if (of_property_read_u32(np, "cell-index", &val) &&
> +           of_property_read_u32(np, "device-id", &val)) {

I know that this is technically correct, but it's obfuscated IMHO.
'val' is set correctly only when of_property_read_u32(...) is "false",
which is doubly-weird because of_property_read_u32(...) doesn't
actually return a boolean.

I would rather you break this into two if-statements like the original code.