linux-kernel - Re: [PATCH] PCI: dwc: layerscape: convert to builtin_platform

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Message-ID: <CAGETcx8_6Hp+MWFOhRohXwdWFSfCc7A=zpb5QYNHZE5zv0bDig@mail.gmail.com>
Date:   Wed, 20 Jan 2021 15:58:26 -0800
From:   Saravana Kannan <saravanak@...gle.com>
To:     Michael Walle <michael@...le.cc>
Cc:     Rob Herring <robh@...nel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        PCI <linux-pci@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Minghuan Lian <minghuan.Lian@....com>,
        Mingkai Hu <mingkai.hu@....com>, Roy Zang <roy.zang@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] PCI: dwc: layerscape: convert to builtin_platform_driver()

On Wed, Jan 20, 2021 at 3:53 PM Michael Walle <michael@...le.cc> wrote:
>
> Am 2021-01-20 20:47, schrieb Saravana Kannan:
> > On Wed, Jan 20, 2021 at 11:28 AM Michael Walle <michael@...le.cc>
> > wrote:
> >>
> >> [RESEND, fat-fingered the buttons of my mail client and converted
> >> all CCs to BCCs :(]
> >>
> >> Am 2021-01-20 20:02, schrieb Saravana Kannan:
> >> > On Wed, Jan 20, 2021 at 6:24 AM Rob Herring <robh@...nel.org> wrote:
> >> >>
> >> >> On Wed, Jan 20, 2021 at 4:53 AM Michael Walle <michael@...le.cc>
> >> >> wrote:
> >> >> >
> >> >> > fw_devlink will defer the probe until all suppliers are ready. We can't
> >> >> > use builtin_platform_driver_probe() because it doesn't retry after probe
> >> >> > deferral. Convert it to builtin_platform_driver().
> >> >>
> >> >> If builtin_platform_driver_probe() doesn't work with fw_devlink, then
> >> >> shouldn't it be fixed or removed?
> >> >
> >> > I was actually thinking about this too. The problem with fixing
> >> > builtin_platform_driver_probe() to behave like
> >> > builtin_platform_driver() is that these probe functions could be
> >> > marked with __init. But there are also only 20 instances of
> >> > builtin_platform_driver_probe() in the kernel:
> >> > $ git grep ^builtin_platform_driver_probe | wc -l
> >> > 20
> >> >
> >> > So it might be easier to just fix them to not use
> >> > builtin_platform_driver_probe().
> >> >
> >> > Michael,
> >> >
> >> > Any chance you'd be willing to help me by converting all these to
> >> > builtin_platform_driver() and delete builtin_platform_driver_probe()?
> >>
> >> If it just moving the probe function to the _driver struct and
> >> remove the __init annotations. I could look into that.
> >
> > Yup. That's pretty much it AFAICT.
> >
> > builtin_platform_driver_probe() also makes sure the driver doesn't ask
> > for async probe, etc. But I doubt anyone is actually setting async
> > flags and still using builtin_platform_driver_probe().
>
> Hasn't module_platform_driver_probe() the same problem? And there
> are ~80 drivers which uses that.

Yeah. The biggest problem with all of these is the __init markers.
Maybe some familiar with coccinelle can help?

-Saravana