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

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Message-ID: <de4d1e8a-c971-1f4d-2996-883341d287b3@rock-chips.com>
Date:   Fri, 10 Mar 2017 11:22:26 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Brian Norris <briannorris@...omium.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     shawn.lin@...k-chips.com, linux-kernel@...r.kernel.org,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        Wenrui Li <wenrui.li@...k-chips.com>,
        linux-pci@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v2 3/5] PCI: rockchip: add remove() support

On 2017/3/10 10:46, Brian Norris wrote:
> Currently, if we try to unbind the platform device, the remove will
> succeed, but the removal won't undo most of the registration, leaving
> partially-configured PCI devices in the system.
>
> This allows, for example, a simple 'lspci' to crash the system, as it
> will try to touch the freed (via devm_*) driver structures.
>
> So let's implement device remove().
>

As this patchset seems to be merged together so I think the following
warning will be ok? if my git-am robot only pick your patch 1->compile->
patch 2->compile->patch 3 then

drivers/pci/host/pcie-rockchip.c: In function 'rockchip_pcie_remove':
drivers/pci/host/pcie-rockchip.c:1435:2: error: implicit declaration of 
function 'pci_unmap_iospace' [-Werror=implicit-function-declaration]
   pci_unmap_iospace(rockchip->io);

but I guess you may need to move your patch 4 ahead of patch 3?


> Signed-off-by: Brian Norris <briannorris@...omium.org>
> ---
> v2:
> * unmap IO space with pci_unmap_iospace()
> * remove IRQ domain
> ---
>  drivers/pci/host/pcie-rockchip.c | 36 ++++++++++++++++++++++++++++++++++--
>  1 file changed, 34 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
> index 5d7b27b1e941..d2e5078ae331 100644
> --- a/drivers/pci/host/pcie-rockchip.c
> +++ b/drivers/pci/host/pcie-rockchip.c
> @@ -223,9 +223,11 @@ struct rockchip_pcie {
>  	int	link_gen;
>  	struct	device *dev;
>  	struct	irq_domain *irq_domain;
> -	u32     io_size;
>  	int     offset;
> +	struct pci_bus *root_bus;
> +	struct resource *io;
>  	phys_addr_t io_bus_addr;
> +	u32     io_size;
>  	void    __iomem *msg_region;
>  	u32     mem_size;
>  	phys_addr_t msg_bus_addr;
> @@ -1360,6 +1362,7 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>  					 err, io);
>  				continue;
>  			}
> +			rockchip->io = io;
>  			break;
>  		case IORESOURCE_MEM:
>  			mem = win->res;
> @@ -1391,6 +1394,7 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>  		err = -ENOMEM;
>  		goto err_free_res;
>  	}
> +	rockchip->root_bus = bus;
>
>  	pci_bus_size_bridges(bus);
>  	pci_bus_assign_resources(bus);
> @@ -1421,6 +1425,34 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>  	return err;
>  }
>
> +static int rockchip_pcie_remove(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
> +
> +	pci_stop_root_bus(rockchip->root_bus);
> +	pci_remove_root_bus(rockchip->root_bus);
> +	pci_unmap_iospace(rockchip->io);
> +	irq_domain_remove(rockchip->irq_domain);
> +
> +	phy_power_off(rockchip->phy);
> +	phy_exit(rockchip->phy);
> +
> +	clk_disable_unprepare(rockchip->clk_pcie_pm);
> +	clk_disable_unprepare(rockchip->hclk_pcie);
> +	clk_disable_unprepare(rockchip->aclk_perf_pcie);
> +	clk_disable_unprepare(rockchip->aclk_pcie);
> +
> +	if (!IS_ERR(rockchip->vpcie3v3))
> +		regulator_disable(rockchip->vpcie3v3);
> +	if (!IS_ERR(rockchip->vpcie1v8))
> +		regulator_disable(rockchip->vpcie1v8);
> +	if (!IS_ERR(rockchip->vpcie0v9))
> +		regulator_disable(rockchip->vpcie0v9);
> +
> +	return 0;
> +}
> +
>  static const struct dev_pm_ops rockchip_pcie_pm_ops = {
>  	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(rockchip_pcie_suspend_noirq,
>  				      rockchip_pcie_resume_noirq)
> @@ -1438,6 +1470,6 @@ static struct platform_driver rockchip_pcie_driver = {
>  		.pm = &rockchip_pcie_pm_ops,
>  	},
>  	.probe = rockchip_pcie_probe,
> -
> +	.remove = rockchip_pcie_remove,
>  };
>  builtin_platform_driver(rockchip_pcie_driver);
>


-- 
Best Regards
Shawn Lin