linux-kernel - Re: [RESEND PATCH v2] dmaengine: mxs: fix driver registering

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Date:   Thu, 9 Jun 2022 08:01:24 +0200
From:   Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        linux-kernel@...r.kernel.org,
        Amarula patchwork <linux-amarula@...rulasolutions.com>,
        stable@...r.kernel.org, Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [RESEND PATCH v2] dmaengine: mxs: fix driver registering

Hi

On Thu, Jun 9, 2022 at 7:48 AM Vinod Koul <vkoul@...nel.org> wrote:
>
> On 07-06-22, 11:58, Dario Binacchi wrote:
> > Driver registration fails on SOC imx8mn as its supplier, the clock
> > control module, is not ready. Since platform_driver_probe(), as
> > reported by its description, is incompatible with deferred probing,
> > we have to use platform_driver_register().
> >
> > Fixes: a580b8c5429a ("dmaengine: mxs-dma: add dma support for i.MX23/28")
> > Co-developed-by: Michael Trimarchi <michael@...rulasolutions.com>
> > Signed-off-by: Michael Trimarchi <michael@...rulasolutions.com>
> > Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
> > Cc: stable@...r.kernel.org
> >
> > ---
> >
> > Changes in v2:
> > - Add the tag "Cc: stable@...r.kernel.org" in the sign-off area.
> >
> >  drivers/dma/mxs-dma.c | 11 ++++-------
> >  1 file changed, 4 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
> > index 994fc4d2aca4..b8a3e692330d 100644
> > --- a/drivers/dma/mxs-dma.c
> > +++ b/drivers/dma/mxs-dma.c
> > @@ -670,7 +670,7 @@ static enum dma_status mxs_dma_tx_status(struct dma_chan *chan,
> >       return mxs_chan->status;
> >  }
> >
> > -static int __init mxs_dma_init(struct mxs_dma_engine *mxs_dma)
> > +static int mxs_dma_init(struct mxs_dma_engine *mxs_dma)
>
> why drop __init for these...?
>

I think that you refer to the fact that it can not be compiled as a
module, am I right?

Michael

> >  {
> >       int ret;
> >
> > @@ -741,7 +741,7 @@ static struct dma_chan *mxs_dma_xlate(struct of_phandle_args *dma_spec,
> >                                    ofdma->of_node);
> >  }
> >
> > -static int __init mxs_dma_probe(struct platform_device *pdev)
> > +static int mxs_dma_probe(struct platform_device *pdev)
> >  {
> >       struct device_node *np = pdev->dev.of_node;
> >       const struct mxs_dma_type *dma_type;
> > @@ -839,10 +839,7 @@ static struct platform_driver mxs_dma_driver = {
> >               .name   = "mxs-dma",
> >               .of_match_table = mxs_dma_dt_ids,
> >       },
> > +     .probe = mxs_dma_probe,
> >  };
> >
> > -static int __init mxs_dma_module_init(void)
> > -{
> > -     return platform_driver_probe(&mxs_dma_driver, mxs_dma_probe);
> > -}
>
> > -subsys_initcall(mxs_dma_module_init);
> > +module_platform_driver(mxs_dma_driver);
> > --
> > 2.32.0
>
> --
> ~Vinod