Re: lockdep warning in urb.c:363 usb_submit_urb

Oliver Neukum
2020-03-23T16:20:17Z

Am Montag, den 23.03.2020, 15:57 +0000 schrieb Qais Yousef:
> On 03/23/20 16:36, Oliver Neukum wrote:
> > Am Montag, den 23.03.2020, 14:38 +0000 schrieb Qais Yousef:
> > > Hi
> > >
> > > I've hit the following lockdep warning when I trigger hibernate on arm64
> > > platform (Juno-r2)
> > >
> > >
> > > echo suspend > /sys/power/disk
> > > echo disk > /sys/power/state
> > >
> > > I only had a usb flash drive attached to it. Let me know if you need more info.
> >
> > Hi,
> >
> > that is not a lockdep issue, but the hub driver is not properly killing
> > its URB presumably. Yet, the driver looks correct to me. Please use
> > the additional patch and activate dynamic debugging for usbcore.
>
> Yes sorry my bad, it's a WARN_ONCE().
>
> I applied your patch and will reproduce, but meanwhile not sure if you noticed
> this line in my previous email
>
> [ 327.154849] usb usb2: runtime PM trying to activate child device usb2 but parent (7ffb0000.ohci) is not active

Hi,

yes I noticed, but that did not trigger the WARN(). One thing at a time
please.

Regards
Oliver