Messages in this thread | | | Subject | Re: [PATCH] usbnet: prevent device rpm suspend in usbnet_probe function | From | Oliver Neukum <> | Date | Mon, 07 Nov 2016 11:32:25 +0100 |
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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
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