linux-kernel - Re: [PATCH 4/4] PCI: mediatek: Add loadable kernel module support

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Date:   Thu, 28 Jun 2018 09:17:32 +0800
From:   Honghui Zhang <honghui.zhang@...iatek.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>, <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        <yingjoe.chen@...iatek.com>,
        Eddie Huang <eddie.huang@...iatek.com>,
        <ryder.lee@...iatek.com>, <hongkun.cao@...iatek.com>,
        <youlin.pei@...iatek.com>, <yong.wu@...iatek.com>,
        YT Shen <yt.shen@...iatek.com>, <sean.wang@...iatek.com>
Subject: Re: [PATCH 4/4] PCI: mediatek: Add loadable kernel module support

On Wed, 2018-06-27 at 19:39 +0300, Andy Shevchenko wrote:
> On Wed, Jun 27, 2018 at 12:21 PM,  <honghui.zhang@...iatek.com> wrote:
> > From: Honghui Zhang <honghui.zhang@...iatek.com>
> >
> > Implement remove callback function for Mediatek PCIe driver to add
> > loadable kernel module support.
> 
> > +static void mtk_pcie_irq_teardown(struct mtk_pcie *pcie)
> > +{
> > +       struct mtk_pcie_port *port, *tmp;
> > +
> 
> > +       if (list_empty(&pcie->ports))
> > +               return;
> 
> This is redundant.

Yeah, you are right, I will remove it.

> 
> > +
> > +       list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
> > +               irq_set_chained_handler_and_data(port->irq, NULL, NULL);
> > +
> > +               if (port->irq_domain)
> > +                       irq_domain_remove(port->irq_domain);
> > +
> > +               if (IS_ENABLED(CONFIG_PCI_MSI)) {
> > +                       if (port->msi_domain)
> > +                               irq_domain_remove(port->msi_domain);
> > +                       if (port->inner_domain)
> > +                               irq_domain_remove(port->inner_domain);
> > +               }
> > +
> > +               irq_dispose_mapping(port->irq);
> > +       }
> > +}
> 
> > +static void mtk_pcie_free_resources(struct mtk_pcie *pcie)
> > +{
> > +       struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
> > +       struct list_head *windows = &host->windows;
> > +
> > +       pci_unmap_iospace(&pcie->pio);
> > +       pci_free_resource_list(windows);
> > +}
> > +
> > +static int mtk_pcie_remove(struct platform_device *pdev)
> > +{
> > +       struct mtk_pcie *pcie = platform_get_drvdata(pdev);
> > +       struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
> > +
> > +       pci_stop_root_bus(host->bus);
> > +       pci_remove_root_bus(host->bus);
> > +       mtk_pcie_free_resources(pcie);
> > +
> > +       mtk_pcie_irq_teardown(pcie);
> > +
> 
> > +       if (!list_empty(&pcie->ports))
> 
> I think this is also not needed. Do you put runtime PM by the way?

Yes, it's could be removed.
the pm was putted in mtk_pcie_put_resources which will call
mtk_pcie_subsys_powerdown, and the pm was putted in that function.

thanks.

> 
> > +               mtk_pcie_put_resources(pcie);
> > +
> > +       return 0;
> > +}
>