linux-kernel - Re: [PATCH v2 5/7] memory: renesas-rpc-if: Return error in case devm_ioremap

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Message-ID: <CAMuHMdX4HfLUfDk2eZkBugP_ysL3w+qvZqKSR3e47HG4RTggXw@mail.gmail.com>
Date:   Wed, 27 Oct 2021 09:21:24 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Rob Herring <robh+dt@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Mark Brown <broonie@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        MTD Maling List <linux-mtd@...ts.infradead.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Chris Brandt <Chris.Brandt@...esas.com>
Subject: Re: [PATCH v2 5/7] memory: renesas-rpc-if: Return error in case
 devm_ioremap_resource() fails

On Wed, Oct 27, 2021 at 9:17 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> On Mon, Oct 25, 2021 at 10:57 PM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > Make sure we return error in case devm_ioremap_resource() fails for dirmap
> > resource.
> >
> > Fixes: ca7d8b980b67 ("memory: add Renesas RPC-IF driver")
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
> > Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
>
> Thanks for your patch!
>
> > --- a/drivers/memory/renesas-rpc-if.c
> > +++ b/drivers/memory/renesas-rpc-if.c
> > @@ -243,7 +243,7 @@ int rpcif_sw_init(struct rpcif *rpc, struct device *dev)
> >         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dirmap");
> >         rpc->dirmap = devm_ioremap_resource(&pdev->dev, res);
> >         if (IS_ERR(rpc->dirmap))
> > -               rpc->dirmap = NULL;
> > +               return PTR_ERR(rpc->dirmap);
>
> IIRC, it was intentional to make the dirmap optional (because the
> device can be used without and/or because some variants on other SoCs
> lack it?).  Unfortunately this is not reflected in the DT bindings
> (yet?).  All code using the dirmap does check if rpc->dirmap is
> valid first.
>
> >         rpc->size = resource_size(res);

Of course this will crash if the dirmap is not present, so for now it's better
to just bail out.

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

> >
> >         rpc->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds