linux-kernel - Re: [PATCH 3/9] PCI: mvebu: remove subsys

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Date:	Tue, 13 Aug 2013 11:25:35 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Thierry Reding <thierry.reding@...il.com>
CC:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH 3/9] PCI: mvebu: remove subsys_initcall

On 08/13/13 10:06, Thierry Reding wrote:
> On Tue, Aug 13, 2013 at 09:19:59AM +0200, Thomas Petazzoni wrote:
>> On Mon, 12 Aug 2013 20:46:49 +0200, Sebastian Hesselbarth wrote:
>>> This removes the subsys_initcall from the driver and converts it to
>>> a normal platform_driver. Also, drvdata is set and a remove functions
>>> is added to disable the clock and free resources.
>>>
>>> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
>>
>> I'm OK with this, just a comment below.
>>
>>> +static int mvebu_pcie_remove(struct platform_device *pdev)
>>> +{
>>> +	struct mvebu_pcie *pcie = platform_get_drvdata(pdev);
>>> +	struct mvebu_pcie_port *port = &pcie->ports[0];
>>> +	int i;
>>> +
>>> +	for (i = 0; i < pcie->nports; i++, port++) {
>>> +		clk_disable_unprepare(port->clk);
>>> +		kfree(port->name);
>>> +	}
>>> +
>>> +	return 0;
>>> +}
>>
>> I believe the ->remove() part is quite useless. The driver is a 'bool'
>> in Kconfig, so it cannot be compiled as a module, and I'm not sure
>> there a way to remove the platform device that corresponds to the PCIe
>> controller.
>
> There is. You can write the device's name to the driver's unbind file in
> sysfs. What I ended up doing for Tegra was not to provide a .remove() at
> all and set the struct device_driver's .suppress_bind_attrs to true.
[...]
> That said, I agree with Thomas that it's not useful (and potentially
> even dangerous) to add the .remove() at this point in time.

Thierry, Thomas,

I will not introduce the .remove and set .suppress_bind_attrs = true as
Thierry suggested.

Sebastian

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