From: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
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>
Subject: Re: [PATCH v2 5/5] PCI: dwc: Save root bus for driver remove
Date: Wed, 13 Mar 2019 10:33:13 +0000 [thread overview]
Message-ID: <962065dc-6e9d-d481-ca56-a2045ca7fef0@synopsys.com> (raw)
In-Reply-To: <20190301125943.47adae82@xhacker.debian>
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);
> };
>
prev parent reply other threads:[~2019-03-13 10:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-01 5:02 [PATCH v2 0/5] PCI: dwc: Support remove Jisheng Zhang
2019-03-01 5:03 ` [PATCH v2 1/5] PCI: dwc: Fix dw_pcie_free_msi() if msi_irq is invalid Jisheng Zhang
2019-03-13 10:05 ` Gustavo Pimentel
2019-03-01 5:04 ` [PATCH v2 2/5] PCI: dwc: Free the page for MSI IRQ in dw_pcie_free_msi() Jisheng Zhang
2019-03-13 10:12 ` Gustavo Pimentel
2019-03-01 5:05 ` [PATCH v2 3/5] PCI: dwc: Free MSI in the error code path of dw_pcie_host_init() Jisheng Zhang
2019-03-13 10:24 ` Gustavo Pimentel
2019-03-01 5:06 ` [PATCH v2 4/5] PCI: dwc: Use devm_pci_alloc_host_bridge() to simplify the code Jisheng Zhang
2019-03-13 10:37 ` Gustavo Pimentel
2019-03-01 5:06 ` [PATCH v2 5/5] PCI: dwc: Save root bus for driver remove Jisheng Zhang
2019-03-13 10:33 ` Gustavo Pimentel [this message]
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