linux-kernel - Re: [PATCH v2 02/45] drivers: tty: serial: 8250_dw: use devm_ioremap

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Date:   Fri, 15 Mar 2019 11:04:12 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Enrico Weigelt, metux IT consult" <info@...ux.net>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Eric Anholt <eric@...olt.net>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Tobias Klauser <tklauser@...tanz.ch>,
        Richard Genoud <richard.genoud@...il.com>,
        macro@...ux-mips.org,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>, slemieux.tyco@...il.com,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>, baohua@...nel.org,
        Peter Korsgaard <jacmet@...site.dk>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org,
        "open list:LINUX FOR POWERPC PA SEMI PWRFICIENT" 
        <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2 02/45] drivers: tty: serial: 8250_dw: use devm_ioremap_resource()

On Fri, Mar 15, 2019 at 12:41 AM Enrico Weigelt, metux IT consult
<info@...ux.net> wrote:
>
> Instead of fetching out data from a struct resource for passing
> it to devm_ioremap(), directly use devm_ioremap_resource()

I don't see any advantage of this change.
See also below.

> --- a/drivers/tty/serial/8250/8250_dw.c
> +++ b/drivers/tty/serial/8250/8250_dw.c
> @@ -526,7 +526,7 @@ static int dw8250_probe(struct platform_device *pdev)
>         p->set_ldisc    = dw8250_set_ldisc;
>         p->set_termios  = dw8250_set_termios;
>
> -       p->membase = devm_ioremap(dev, regs->start, resource_size(regs));
> +       p->membase = devm_ioremap_resource(dev, regs);
>         if (!p->membase)

And how did you test this? devm_ioremap_resource() returns error
pointer in case of error.

>                 return -ENOMEM;

-- 
With Best Regards,
Andy Shevchenko