On Wed, 23 Mar 2016, yoma sophian wrote:
> hi Alan:
> 2016-03-04 23:25 GMT+08:00 Alan Stern :
> > On Fri, 4 Mar 2016, yoma sophian wrote:
> >
> >> BTW, when I disable BH support in hcd driver.
> >> I get below recursion of spin lock sometimes.
> >> Did I missing anything once disable BH?
> >
> > Y
hi Alan:
2016-03-04 23:25 GMT+08:00 Alan Stern :
> On Fri, 4 Mar 2016, yoma sophian wrote:
>
>> BTW, when I disable BH support in hcd driver.
>> I get below recursion of spin lock sometimes.
>> Did I missing anything once disable BH?
>
> Yes, you missed a very important fact: ehci-hcd _requires_ BH
On Fri, 4 Mar 2016, yoma sophian wrote:
> hi Alan and Peter:
> >>
> >> Backtrace:
> >> [] (ehci_handle_start_intr_unlinks [ehci_hcd]) from
> >> [] (ehci_bus_suspend+0x388/0x464 [ehci_hcd])
> >
> > Since there aren't any devices registered on the USB bus yet,
> > ehci_handle_start_intr_unlink() sho
hi Alan and Peter:
>>
>> Backtrace:
>> [] (ehci_handle_start_intr_unlinks [ehci_hcd]) from
>> [] (ehci_bus_suspend+0x388/0x464 [ehci_hcd])
>
> Since there aren't any devices registered on the USB bus yet,
> ehci_handle_start_intr_unlink() should do nothing. It iterates over
> ehci->intr_unlink, bu
On Thu, Mar 03, 2016 at 11:16:11PM +0800, yoma sophian wrote:
> hi all:
> When I porting my platform ehci driver on kernel v4.1,
> I get back trace like below without plug in any device and just insert
> usb-common.ko, usbcore.ko and ehci-hcd.ko.
> (and detail is show in the attachment)
>
> It see
On Thu, 3 Mar 2016, yoma sophian wrote:
> hi all:
> When I porting my platform ehci driver on kernel v4.1,
> I get back trace like below without plug in any device and just insert
> usb-common.ko, usbcore.ko and ehci-hcd.ko.
> (and detail is show in the attachment)
>
> It seems caused by the PM r
hi all:
When I porting my platform ehci driver on kernel v4.1,
I get back trace like below without plug in any device and just insert
usb-common.ko, usbcore.ko and ehci-hcd.ko.
(and detail is show in the attachment)
It seems caused by the PM related thread that is wakened up, even
there is no devi
