On Fri, 2016-11-04 at 09:26 -0400, Alan Stern wrote:
> On Fri, 4 Nov 2016, Kai-Heng Feng wrote:
>
> > Sometimes cdc_mbim failed to probe if runtime pm is enabled:
> > [ 9.305626] cdc_mbim: probe of 2-2:1.12 failed with error -22
> >
> > This can be solved by increase its pm usage counter.
>
> This should not be needed. The USB core increments the PM usage
> counter of a device before probing its interfaces.
Indeed. Yet we have experimental evidence.
Kai-Heng Feng, could you please enable dynamic debugging
for
drivers/usb/core/driver.c
so that we can see what is going on with the usage counters?
Regards
Oliver
