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

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Date:   Fri, 15 Mar 2019 10:37:09 +0100
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        "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 15.03.19 10:04, Andy Shevchenko wrote:
> 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.

I see that the whole story wasn't clear. Please see my reply to Greg,
hope that clears it up a little bit.

>> --- 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.

hmm, devm_ioremap_resource() does so, but devm_ioremap() does not ?
I really didn't expect that. Thanks for pointing that out.


--mtx

-- 
Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287