Re: [PATCH] USB: for usb_autopm_get_interface_async -EINPROGRESS is not an error

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On Tue, Sep 06, 2011 at 09:07:20PM -0500, Jim Wylder wrote:
> A return value of -EINPROGRESS from pm_runtime_get indicates that
> the device is already resuming due to a previous call.  Internally,
> usb_autopm_get_interface_async doesn't treat this as an error and
> increments the usage count, but passes the error status along
> to the caller.  The logical assumption of the caller is that
> any negative return value reflects the device not resuming
> and the pm_usage_cnt not being incremented.  Since the usage count
> is being incremented and the device is resuming, return success (0)
> instead.
> 
> Signed-off-by: James Wylder <james.wylder@xxxxxxxxxxxx>

Is this something that is causing problems for some devices?  Should it
go to older stable kernels as well?

thanks,

greg k-h
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