linux-kernel - Re: [PATCH v9 5/5] usb: dwc3: core: cleanup IRQ resources

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Date:	Tue, 07 Jun 2016 16:09:14 +0300
From:	Felipe Balbi <balbi@...nel.org>
To:	Roger Quadros <rogerq@...com>,
	Grygorii Strashko <grygorii.strashko@...com>
Cc:	tony@...mide.com, Joao.Pinto@...opsys.com,
	sergei.shtylyov@...entembedded.com, peter.chen@...escale.com,
	jun.li@...escale.com, yoshihiro.shimoda.uh@...esas.com,
	nsekhar@...com, b-liu@...com, linux-usb@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 5/5] usb: dwc3: core: cleanup IRQ resources


Hi,

(guys, please make sure to break lines at 80-columns)

Roger Quadros <rogerq@...com> writes:
>>>>> @@ -2853,6 +2852,23 @@ static irqreturn_t dwc3_interrupt(int irq, void *_evt)
>>>>>    int dwc3_gadget_init(struct dwc3 *dwc)
>>>>>    {
>>>>>        int                    ret;
>>>>> +    struct resource *res;
>>>>> +    struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
>>>>> +
>>>>> +    dwc->irq_gadget = platform_get_irq_byname(dwc3_pdev, "peripheral");
>>>>> +    if (dwc->irq_gadget <= 0) {
>>>>
>>>> Is it expected to get -EPROBE_DEFER here?
>>>
>>> Probably not as we don't have any chance of deferring probe here. We've already
>>> probed successfully and are just turning on the gadget mode here.
>> 
>> In general, you can't say that you've been probed successfully if not
>> all resources are ready, and irq is a resource :) It's expected that
>> all resources will be requested in probe, but here you are trying to
>> get resource outside of probe. As result, it will be perfectly
>> possible to get -EPROBE_DEFER here if on some HW GPIO IRQ will be
>> used as peripheral, or host or otg irq (for example), because GPIO
>> IRQ controller might not be ready at the moment when IRQ resource is
>> requested.
>
> I agree with you.
>
> Felipe, are you ok with moving the IRQ resource obtaining code to probe?

You mean that probe() would setup all gadget_irq, otg_irq and host_irq
while the other pieces (otg.c, gadget.c and host.c) only use it?

yeah, that should be fine. No problems.

-- 
balbi

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