linux-kernel - Re: [PATCH v2 3/5] PCI: rockchip: add remove() support

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Date:   Thu, 30 Mar 2017 17:26:09 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        Wenrui Li <wenrui.li@...k-chips.com>,
        linux-pci@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        Ray Jui <rjui@...adcom.com>
Subject: Re: [PATCH v2 3/5] PCI: rockchip: add remove() support

Hi Bjorn,

On Thu, Mar 30, 2017 at 06:28:25PM -0500, Bjorn Helgaas wrote:
> On Fri, Mar 24, 2017 at 10:22:19AM -0700, Brian Norris wrote:
> > On Fri, Mar 24, 2017 at 09:25:41AM -0500, Bjorn Helgaas wrote:
> > > These don't have .remove:
> > > 
> > >   imx6_pcie_driver
> > >   ls_pcie_driver
> > >   armada8k_pcie_driver
> > >   artpec6_pcie_driver
> > >   dw_plat_pcie_driver
> > >   hisi_pcie_driver
> > >   hisi_pcie_almost_ecam_driver
> > >   spear13xx_pcie_driver
> > >   gen_pci_driver
> > 
> > I think these are all technically broken.
> 
> Can we fix them all at the same time as you fix Rockchip?  Maybe we
> should have a series that adds ".suppress_bind_attrs = true" to all
> these drivers,

Sure, I can do that.

> including Rockchip.

Huh? Why? So I can revert that in the next patch?

> Then you could have this current 
> series to make Rockchip modular on top, if there's still value in it.

I do see value in it. That's the whole reason I wrote this patchset.
It's useful for stressing out certain behaviors that will happen all the
time (i.e., boot-time initialization, from platform probe, to bus init,
to client/EP init), via repeated bind/unbind (or modprobe/rmmod). It's
much faster than reboot testing.

Personally, I'd rather just patch the other drivers, and you can wait
until I follow through on that promise before applying my existing work
for the Rockchip driver, if that's what you'd prefer.

> If we find a common problem, I'd like to fix it everywhere we know
> about so it doesn't get forgotten or copied to even more places.

Sure. But you only just pointed out how broken several drivers were; I
didn't really notice :)

Brian