Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH v2 5/5] PCI: dwc: Save root bus for driver remove
To:     Jisheng Zhang <Jisheng.Zhang@synaptics.com>,
        Jingoo Han <jingoohan1@gmail.com>,
        Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Bjorn Helgaas <bhelgaas@google.com>
CC:     "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>
References: <20190301125510.4e2ee985@xhacker.debian>
 <20190301125943.47adae82@xhacker.debian>
From:   Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Message-ID: <962065dc-6e9d-d481-ca56-a2045ca7fef0@synopsys.com>
Date:   Wed, 13 Mar 2019 10:33:13 +0000
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101
 Thunderbird/60.5.0
MIME-Version: 1.0
In-Reply-To: <20190301125943.47adae82@xhacker.debian>
Content-Type: text/plain; charset="utf-8"
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi,

On 01/03/2019 05:06, Jisheng Zhang wrote:
> Currently dwc host doesn't support the remove, but nothing prevent us
> from supporting it. Save the root bus for clean up work in driver
> remove code path.
> 
> After this patch, the dwc host users could implement its remove as:
> 
> static int foo_pcie_remove(struct platform_device *pdev)
> {
> 	...
> 	pci_stop_root_bus(pp->root_bus);
> 	pci_remove_root_bus(pp->root_bus);
> 	dw_pcie_free_msi(pp);
> 	...
> }
> 
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 1 +
>  drivers/pci/controller/dwc/pcie-designware.h      | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 4831c12fee93..ca45a4471ca0 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -496,6 +496,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
>  		goto err_free_msi;
>  
>  	bus = bridge->bus;
> +	pp->root_bus = bus;

Why you don't use from the begging the pp->root_bus variable instead of bus
variable? That way we can remove the bus variable.

Regards,
Gustavo

>  
>  	if (pp->ops->scan_bus)
>  		pp->ops->scan_bus(pp);
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 3be7ca9f1fc3..cd92ded606c6 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -182,6 +182,7 @@ struct pcie_port {
>  	struct page		*msi_page;
>  	u32			num_vectors;
>  	u32			irq_mask[MAX_MSI_CTRLS];
> +	struct pci_bus		*root_bus;
>  	raw_spinlock_t		lock;
>  	DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS);
>  };
>