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

[Gabriel Fernandez]

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@xxxxxxxxxx> wrote:
> On Wed, May 6, 2015 at 4:14 AM, Gabriel Fernandez
> <gabriel.fernandez@xxxxxxxxxx> wrote:
>> Hi Bjorn,
>>
>> On 6 May 2015 at 00:16, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> 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@xxxxxx>
>>>> Signed-off-by: Gabriel Fernandez <gabriel.fernandez@xxxxxxxxxx>
>>>
>>>> +/* 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@xxxxxx>");
>>>> +MODULE_DESCRIPTION("PCI express Driver for ST SoCs");
>>>> +MODULE_LICENSE("GPL v2");
>>>> --
>>>> 1.9.1
>>>>
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