Subject: [RFC 3/3] PCI: tegra: Support driver unbinding

From: [email-masked] (Stephen Warren)
Date: Wed, 14 Aug 2013 15:43:40 -0600

On 08/13/2013 05:12 AM, Thierry Reding wrote:
> Implement the platform driver's .remove() callback to free all resources
> allocated during driver setup and call pci_common_exit() to cleanup ARM
> specific datastructures. Unmap the fixed PCI I/O mapping by calling the
> new pci_iounmap_io() function in the new .teardown() callback.
> 
> Finally, no longer set the .suppress_bind_attrs field to true to allow
> the driver to unbind from a device.

> +static int tegra_pcie_remove(struct platform_device *pdev)
> +{
> +	struct tegra_pcie *pcie = platform_get_drvdata(pdev);
> +	struct tegra_pcie_bus *bus, *tmp;
> +	int err;
> +
> +	pci_common_exit(&pcie->sys);
> +
> +	list_for_each_entry_safe(bus, tmp, &pcie->busses, list) {
> +		vunmap(bus->area->addr);
> +		kfree(bus);
> +	}
> +
> +	if (IS_ENABLED(CONFIG_PCI_MSI)) {
> +		err = tegra_pcie_disable_msi(pcie);
> +		if (err < 0)
> +			return err;
> +	}

Wouldn't it make sense to do that as early as possible in the function,
to make sure that no MSI accidentally fires after some of the cleanup
has already happened?

> +
> +	err = tegra_pcie_put_resources(pcie);
> +	if (err < 0)
> +		return err;
> +
> +	return 0;
> +}