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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
