linux-kernel - Re: [PATCH V5 1/3] pci: Add PCIe driver for Samsung Exynos

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Date:	Wed, 19 Jun 2013 10:13:16 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Arnd Bergmann' <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	'Thomas Petazzoni' <thomas.petazzoni@...e-electrons.com>,
	'Jason Gunthorpe' <jgunthorpe@...idianresearch.com>,
	linux-samsung-soc@...r.kernel.org,
	'Siva Reddy Kallam' <siva.kallam@...sung.com>,
	'Surendranath Gurivireddy Balla' <suren.reddy@...sung.com>,
	linux-pci@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	'Thierry Reding' <thierry.reding@...onic-design.de>,
	linux-kernel@...r.kernel.org,
	'Grant Likely' <grant.likely@...retlab.ca>,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Thomas Abraham' <thomas.abraham@...aro.org>,
	'Bjorn Helgaas' <bhelgaas@...gle.com>,
	'Andrew Murray' <andrew.murray@....com>,
	Jingoo Han <jg1.han@...sung.com>
Subject: Re: [PATCH V5 1/3] pci: Add PCIe driver for Samsung Exynos

On Tuesday, June 18, 2013 10:57 PM, Arnd Bergmann wrote:
> On Tuesday 18 June 2013, Jingoo Han wrote:
> > On Monday, June 17, 2013 9:45 PM, Arnd Bergmann wrote:
> > > On Monday 17 June 2013 18:45:52 Jingoo Han wrote:
> > > > On Friday, June 14, 2013 9:54 PM, Arnd Bergmann wrote:
> > > > >

[.....]

> >
> > I will remove a 'remove' callback. Is it OK?
> > Or what should I do?
> 
> I think you should keep the remove function, but add a comment explaining that
> you don't allow module unload and that in order to allow it, the remove function
> will have to remove all pci buses and devices under the host bridge.

Then, do you mean the following?

static int __exit exynos_pcie_remove(struct platform_device *pdev)
{
	struct pcie_port *pp = platform_get_drvdata(pdev);

	clk_disable_unprepare(pp->bus_clk);
	clk_disable_unprepare(pp->clk);

	return 0;
}

static struct platform_driver exynos_pcie_driver = {
	.remove	= __exit_p(exynos_pcie_remove),

[.....]

/* Exynos PCIe driver does not allow module unload */

static int __init pcie_init(void)
{
	hook_fault_code(16 + 6, exynos_pcie_abort, SIGBUS, 0,
			"imprecise external abort");

	platform_driver_probe(&exynos_pcie_driver, exynos_pcie_probe);

	return 0;
}
subsys_initcall(pcie_init);

MODULE_AUTHOR("Jingoo Han <jg1.han@...sung.com>");
MODULE_DESCRIPTION("Samsung PCIe host controller driver");
MODULE_LICENSE("GPLv2");


> 
> 	Arnd
> --
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