[RESEND PATCH v5 1/2] dmaengine: mxs: use platform_driver_register

[Dario Binacchi]

Hi Vinoud,

On Tue, Sep 13, 2022 at 6:35 PM Sascha Hauer <s.hauer at pengutronix.de> wrote:
>
> Hi Dario,
>
> On Sun, Sep 04, 2022 at 04:10:19PM +0200, 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 at amarulasolutions.com>
> > Signed-off-by: Michael Trimarchi <michael at amarulasolutions.com>
> > Signed-off-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>
> > Cc: stable at vger.kernel.org
>
> How I see it v3 of this patch is perfectly fine and should be taken
> instead of this one. I just commented that to v3.
>
> Not sure if Vinod would take v3, or if you should resend v3 as v6
> instead. If you do, you can add my Acked-by.
>
> Vinod, please let us know what you prefer.

Could you please let me know how to proceed? This patch has been pending for
a while and it's a real shame as the change is minimal and fixes a
real issue that is
still present in the mainline and stable kernels.

Thanks and regards,
Dario

>
> Sascha
>
> >
> > ---
> >
> > Changes in v5:
> > - Update the commit message.
> > - Add the patch "dmaengine: mxs: fix section mismatch" to remove the
> >   warning raised by this patch.
> >
> > 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 at vger.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
> >
> >
>
> --
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-- 

Dario Binacchi

Embedded Linux Developer

dario.binacchi at amarulasolutions.com

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