linux-kernel - Re: [PATCH v3 3/5] PCI: st: Provide support for the sti PCIe controller

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Date:	Wed, 6 May 2015 15:40:39 +0200
From:	Gabriel Fernandez <gabriel.fernandez@...aro.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Gabriel FERNANDEZ <gabriel.fernandez@...com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...il.com>,
	Maxime Coquelin <maxime.coquelin@...com>,
	Patrice Chotard <patrice.chotard@...com>,
	Russell King <linux@....linux.org.uk>,
	Jingoo Han <jg1.han@...sung.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Fabrice Gasnier <fabrice.gasnier@...com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Greg KH <gregkh@...uxfoundation.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Joe Perches <joe@...ches.com>, Tejun Heo <tj@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Thierry Reding <treding@...dia.com>,
	Phil Edworthy <phil.edworthy@...esas.com>,
	Minghuan Lian <Minghuan.Lian@...escale.com>,
	Tanmay Inamdar <tinamdar@....com>,
	Muralidharan Karicheri <m-karicheri2@...com>,
	Sachin Kamat <sachin.kamat@...sung.com>,
	Andrew Lunn <andrew@...n.ch>,
	Liviu Dudau <liviu.dudau@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kernel@...inux.com" <kernel@...inux.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH v3 3/5] PCI: st: Provide support for the sti PCIe controller

Hi Arnd, Bjorn,

I agree with last reply of Arnd.
 I will mark the probe function as __init and use
platform_driver_probe() to prevent the probe function from being
deferred.
And to prevent module unloading, i will use module_init only.

Ok i will wait before sending a v4.

Thanks.
Gabriel.

On 6 May 2015 at 15:29, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Wed, May 6, 2015 at 4:14 AM, Gabriel Fernandez
> <gabriel.fernandez@...aro.org> wrote:
>> Hi Bjorn,
>>
>> On 6 May 2015 at 00:16, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>>> On Fri, Apr 10, 2015 at 11:12:46AM +0200, Gabriel FERNANDEZ wrote:
>>>> sti pcie is built around a Synopsis Designware PCIe IP.
>>>>
>>>> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
>>>> Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...aro.org>
>>>
>>>> +/* ST PCIe driver does not allow module unload */
>>>
>>> Is there something that prevents module unload, or is it just untested?
>>>
>> Yes we haven't tested
>>
>>>> +static int __init pcie_init(void)
>>>> +{
>>>> +     return platform_driver_probe(&st_pcie_driver, st_pcie_probe);
>>>> +}
>>>> +device_initcall(pcie_init);
>>>
>>> Can you use module_platform_driver_probe() or module_init() here?
>>>
>>
>> Yes we can use module_init() here.
>>
>> By the way if figure out i removed __init attribute on st_pcie_probe()
>> in previous version to follow Arnd's remark.
>> But st_pcie_probe calls hook_fault_code() that has __init attribute.
>> So I think we need to keep __init for probe routine ?
>> Also, we have to restrict bind/unbind with "suppress_bind_attrs" in
>> platform_driver structure.
>> This is the main reason to not allow module unload/reload.
>
> I don't really care which solution you end up with here.  But please
> do take a look at how the other drivers solve the same problem.  Using
> "device_initcall()" is unique in drivers/pci/host, and I don't believe
> the problem is unique.  If several drivers have the same issue, they
> should solve it the same way.
>
>> If you are ok i will send a v4 ?
>
> I think I'll have a few questions about the designware changes, too,
> so you might want to wait a day or two.
>
>>>> +MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@...com>");
>>>> +MODULE_DESCRIPTION("PCI express Driver for ST SoCs");
>>>> +MODULE_LICENSE("GPL v2");
>>>> --
>>>> 1.9.1
>>>>
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