Re: [PATCH v1 4/4] PCI: brcmstb: add shutdown call to driver

Jim Quinlan
2021-05-25T21:40:44Z

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On Tue, May 25, 2021 at 5:18 PM Bjorn Helgaas <helgaas@kernel.org> wrote:
>
> Capitalize "Add" in the subject.
>
> On Tue, Apr 27, 2021 at 01:51:39PM -0400, Jim Quinlan wrote:
> > The shutdown() call is similar to the remove() call except the former does
> > not need to invoke pci_{stop,remove}_root_bus(), and besides, errors occur
> > if it does.
>
> This doesn't explain why shutdown() is necessary. "errors occur"
> might be a hint, except that AFAICT, many similar drivers do invoke
> pci_stop_root_bus() and pci_remove_root_bus() (several of them while
> holding pci_lock_rescan_remove()), without implementing .shutdown().
>
> It is ... unfortunate that there's such a variety of implementations
> here. I don't believe these driver differences are all necessary
> consequences of hardware differences.

Fair enough, I'll dig into the error.

Regards,
Jim Quinlan
Broadcom STB
>
> > Signed-off-by: Jim Quinlan <jim2101024@gmail.com>
> > ---
> > drivers/pci/controller/pcie-brcmstb.c | 10 ++++++++++
> > 1 file changed, 10 insertions(+)
> >
> > diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> > index d3af8d84f0d6..a1fe1a2ada48 100644
> > --- a/drivers/pci/controller/pcie-brcmstb.c
> > +++ b/drivers/pci/controller/pcie-brcmstb.c
> > @@ -1340,6 +1340,15 @@ static int brcm_pcie_remove(struct platform_device *pdev)
> > return 0;
> > }
> >
> > +static void brcm_pcie_shutdown(struct platform_device *pdev)
> > +{
> > + struct brcm_pcie *pcie = platform_get_drvdata(pdev);
> > +
> > + if (pcie->has_err_report)
> > + brcm_unregister_die_notifiers(pcie);
> > + __brcm_pcie_remove(pcie);
> > +}
> > +
> > static const struct of_device_id brcm_pcie_match[] = {
> > { .compatible = "brcm,bcm2711-pcie", .data = &bcm2711_cfg },
> > { .compatible = "brcm,bcm4908-pcie", .data = &bcm4908_cfg },
> > @@ -1460,6 +1469,7 @@ static const struct dev_pm_ops brcm_pcie_pm_ops = {
> > static struct platform_driver brcm_pcie_driver = {
> > .probe = brcm_pcie_probe,
> > .remove = brcm_pcie_remove,
> > + .shutdown = brcm_pcie_shutdown,
> > .driver = {
> > .name = "brcm-pcie",
> > .of_match_table = brcm_pcie_match,
> > --
> > 2.17.1
> >

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