linux-kernel - Re: [PATCH v5 1/2] dmaengine: mxs: use platform_driver

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Message-ID: <20220713085553.yunfuvh6a4gn2phj@pengutronix.de>
Date:   Wed, 13 Jul 2022 10:55:53 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Dario Binacchi <dario.binacchi@...rulasolutions.com>
Cc:     linux-kernel@...r.kernel.org,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-amarula@...rulasolutions.com,
        Sascha Hauer <s.hauer@...gutronix.de>, stable@...r.kernel.org,
        Vinod Koul <vkoul@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        dmaengine@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 1/2] dmaengine: mxs: use platform_driver_register

On 22-07-13, Dario Binacchi wrote:
> Hi Marco,
> 
> On Wed, Jul 13, 2022 at 10:40 AM Marco Felsch <m.felsch@...gutronix.de> wrote:
> >
> > Hi Dario,
> >
> > On 22-07-12, Dario Binacchi wrote:
> > > Driver registration fails on SOC imx8mn as its supplier, the clock
> > > control module, is probed later than subsys initcall level. This driver
> > > uses platform_driver_probe which is not compatible with deferred probing
> > > and won't be probed again later if probe function fails due to clock not
> > > being available at that time.
> > >
> > > This patch replaces the use of platform_driver_probe with
> > > platform_driver_register which will allow probing the driver later again
> > > when the clock control module will be available.
> > >
> > > 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 v5:
> > > - Update the commit message.
> > > - Create a new patch to remove the warning generated by this patch.
> >
> > Please squash this new patch into this patch since you introduce the
> > warning with this patch.
> 
> In version 4 I had only one patch, but Vinod told me to separate the
> patches like
> this. I also think like you, but I did what Vinod asked me to do.
> So, can you agree and actually tell me what to do?

Sorry, I didn't wanted to step in here just saw the patch and it is a
bit strange to fix something by a 2nd patch we introduce by the 1st
patch within the same series. This also increase the probability that
the 2nd patch isn't ported to stable. Anyway, if Vinod is fine with this
as maintainer than it is fine.

Regards,
  Marco

> Thanks and regards,
> Dario
> 
> >
> > Regards,
> >   Marco
> >
> > > Changes in v4:
> > > - Restore __init in front of mxs_dma_probe() definition.
> > > - Rename the mxs_dma_driver variable to mxs_dma_driver_probe.
> > > - Update the commit message.
> > > - Use builtin_platform_driver() instead of module_platform_driver().
> > >
> > > Changes in v3:
> > > - Restore __init in front of mxs_dma_init() definition.
> > >
> > > Changes in v2:
> > > - Add the tag "Cc: stable@...r.kernel.org" in the sign-off area.
> > >
> > >  drivers/dma/mxs-dma.c | 8 ++------
> > >  1 file changed, 2 insertions(+), 6 deletions(-)
> > >
> > > diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
> > > index 994fc4d2aca4..18f8154b859b 100644
> > > --- a/drivers/dma/mxs-dma.c
> > > +++ b/drivers/dma/mxs-dma.c
> > > @@ -839,10 +839,6 @@ 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);
> > > +builtin_platform_driver(mxs_dma_driver);
> > > --
> > > 2.32.0
> > >
> > >
> > >
> 
> 
> 
> -- 
> 
> Dario Binacchi
> 
> Embedded Linux Developer
> 
> dario.binacchi@...rulasolutions.com
> 
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