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Re: [PATCH] usbnet: prevent device rpm suspend in usbnet_probe function

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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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[PATCH] usbnet: prevent device rpm suspend in usbnet_probe function Kai-Heng Feng <kai.heng.feng@canonical.com> - 2016-11-04 11:00 +0100
  Re: [PATCH] usbnet: prevent device rpm suspend in usbnet_probe  function Alan Stern <stern@rowland.harvard.edu> - 2016-11-04 14:30 +0100
    Re: [PATCH] usbnet: prevent device rpm suspend in usbnet_probe  function Oliver Neukum <oneukum@suse.com> - 2016-11-07 11:40 +0100
  Re: [PATCH] usbnet: prevent device rpm suspend in usbnet_probe  function Oliver Neukum <oneukum@suse.com> - 2016-11-07 12:10 +0100

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