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Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt handler and irq thread handler

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2016-12-27 12:05 GMT+01:00 Felipe Balbi <balbi@kernel.org>:
> Hi,
>
> Lu Baolu <baolu.lu@linux.intel.com> writes:
>> On 12/26/2016 04:01 PM, Baolin Wang wrote:
>>> On some platfroms(like x86 platform), when one core is running the USB gadget
>>> irq thread handler by dwc3_thread_interrupt(), meanwhile another core also can
>>> respond other interrupts from dwc3 controller and modify the event buffer by
>>> dwc3_interrupt() function, that will cause getting the wrong event count in
>>> irq thread handler to make the USB function abnormal.
>>>
>>> We should add spin_lock/unlock() in dwc3_check_event_buf() to avoid this race.
>>
>> Why not spin_lock_irq ones? This lock seems to be used in both
>> normal and interrupt threads. Or, I missed anything?
>
> this is top half handler. Interrupts are already disabled.
>
BTW,
We don't use spin_lock in top half handler.
Maybe we should/can switch all spin_lock_irqsave() to simple
spin_lock() in the thread/callbacks?
Or there is a reason to use irqsave() version?

BR
Janusz

> --
> balbi



-- 
Janusz Dziedzic

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[PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt handler and irq thread handler Baolin Wang <baolin.wang@linaro.org> - 2016-12-26 09:10 +0100
  Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt  handler and irq thread handler Lu Baolu <baolu.lu@linux.intel.com> - 2016-12-27 03:50 +0100
    Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt  handler and irq thread handler Baolin Wang <baolin.wang@linaro.org> - 2016-12-27 04:00 +0100
      Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt  handler and irq thread handler Lu Baolu <baolu.lu@linux.intel.com> - 2016-12-27 05:50 +0100
    Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt handler and irq thread handler Felipe Balbi <balbi@kernel.org> - 2016-12-27 12:10 +0100
      Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt  handler and irq thread handler Janusz Dziedzic <janusz.dziedzic@gmail.com> - 2016-12-28 16:30 +0100
        Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt handler and irq thread handler Felipe Balbi <balbi@kernel.org> - 2016-12-28 17:30 +0100
          RE: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt  handler and irq thread handler John Youn <John.Youn@synopsys.com> - 2016-12-29 02:40 +0100
  Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt  handler and irq thread handler Janusz Dziedzic <janusz.dziedzic@gmail.com> - 2016-12-27 12:00 +0100
    Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt  handler and irq thread handler Baolin Wang <baolin.wang@linaro.org> - 2016-12-27 12:10 +0100
      Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt handler and irq thread handler Felipe Balbi <balbi@kernel.org> - 2016-12-27 12:20 +0100
        Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt  handler and irq thread handler Baolin Wang <baolin.wang@linaro.org> - 2016-12-27 13:20 +0100
          Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt  handler and irq thread handler Janusz Dziedzic <janusz.dziedzic@gmail.com> - 2016-12-28 13:40 +0100
            Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt  handler and irq thread handler Baolin Wang <baolin.wang@linaro.org> - 2017-01-03 13:30 +0100
              Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt handler and irq thread handler Felipe Balbi <balbi@kernel.org> - 2017-01-03 13:40 +0100
    Re: [PATCH] usb: dwc3: gadget: Avoid race between dwc3 interrupt handler and irq thread handler Felipe Balbi <balbi@kernel.org> - 2016-12-27 12:10 +0100

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