On 29-Nov-17 5:31 PM, Mikko Perttunen wrote:
> On 25.11.2017 21:32, Manikanta Maddireddy wrote:
>> Implement remove callback function for Tegra PCIe driver to add
>> loadable kernel module support. Change PCI_TEGRA config to tristate to
>> allow pci-tegra driver to be build as a module.
>>
>> Signed-off-by: Manikanta Maddireddy <mmaddireddy@xxxxxxxxxx>
>> ---
>> V2:
>> * no change in this patch
>>
>> drivers/pci/host/Kconfig | 2 +-
>> drivers/pci/host/pci-tegra.c | 31 ++++++++++++++++++++++++++++++-
>> 2 files changed, 31 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
>> index 38d12980db0f..6fd2a5937804 100644
>> --- a/drivers/pci/host/Kconfig
>> +++ b/drivers/pci/host/Kconfig
>> @@ -34,7 +34,7 @@ config PCI_FTPCI100
>> default ARCH_GEMINI
>>
>> config PCI_TEGRA
>> - bool "NVIDIA Tegra PCIe controller"
>> + tristate "NVIDIA Tegra PCIe controller"
>> depends on ARCH_TEGRA
>> help
>> Say Y here if you want support for the PCIe host controller found
>> diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
>> index 7f7b8c9c1e84..bbc2807bcd4a 100644
>> --- a/drivers/pci/host/pci-tegra.c
>> +++ b/drivers/pci/host/pci-tegra.c
>> @@ -35,6 +35,7 @@
>> #include <linux/irqdomain.h>
>> #include <linux/kernel.h>
>> #include <linux/init.h>
>> +#include <linux/module.h>
>> #include <linux/msi.h>
>> #include <linux/of_address.h>
>> #include <linux/of_pci.h>
>> @@ -2720,6 +2721,12 @@ static int tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
>> return -ENOMEM;
>> }
>>
>> +static void tegra_pcie_debugfs_exit(struct tegra_pcie *pcie)
>> +{
>> + debugfs_remove_recursive(pcie->debugfs);
>> + pcie->debugfs = NULL;
>> +}
>> +
>
> I think it's unnecessary to have a helper function for this - just inline it in the remove function.
This helper function can be used in tegra_pcie_debugfs_init(), I will publish a new patch calling this
helper function in both tegra_pcie_debugfs_exit and remove.
>
>> static int tegra_pcie_probe(struct platform_device *pdev)
>> {
>> struct device *dev = &pdev->dev;
>> @@ -2734,6 +2741,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
>> return -ENOMEM;
>>
>> pcie = pci_host_bridge_priv(host);
>> + platform_set_drvdata(pdev, pcie);
>>
>> pcie->soc = of_device_get_match_data(dev);
>> INIT_LIST_HEAD(&pcie->buses);
>> @@ -2816,6 +2824,25 @@ static int tegra_pcie_probe(struct platform_device *pdev)
>> return err;
>> }
>>
>> +static int tegra_pcie_remove(struct platform_device *pdev)
>> +{
>> + struct tegra_pcie *pcie = platform_get_drvdata(pdev);
>> + struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
>> +
>> + if (IS_ENABLED(CONFIG_DEBUG_FS))
>> + tegra_pcie_debugfs_exit(pcie);
>> + pci_stop_root_bus(host->bus);
>> + pci_remove_root_bus(host->bus);
>> + if (IS_ENABLED(CONFIG_PCI_MSI))
>> + tegra_pcie_disable_msi(pcie);
>> + tegra_pcie_disable_ports(pcie);
>> + tegra_pcie_free_resources(pcie);
>> + tegra_pcie_disable_controller(pcie);
>> + tegra_pcie_put_resources(pcie);
>> +
>> + return 0;
>> +}
>> +
>> static struct platform_driver tegra_pcie_driver = {
>> .driver = {
>> .name = "tegra-pcie",
>> @@ -2823,5 +2850,7 @@ static struct platform_driver tegra_pcie_driver = {
>> .suppress_bind_attrs = true,
>> },
>> .probe = tegra_pcie_probe,
>> + .remove = tegra_pcie_remove,
>> };
>> -builtin_platform_driver(tegra_pcie_driver);
>> +module_platform_driver(tegra_pcie_driver);
>> +MODULE_LICENSE("GPL");
>>
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