linux-kernel - Re: [RFC 3/3] PCI: tegra: Support driver unbinding

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Date:	Wed, 14 Aug 2013 15:43:40 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Thierry Reding <thierry.reding@...il.com>
CC:	Russell King <linux@....linux.org.uk>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thierry Reding <treding@...dia.com>
Subject: Re: [RFC 3/3] PCI: tegra: Support driver unbinding

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;
> +}

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