linux-kernel - Re: USB remote wakeup through gpio interrupt

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Date:	Thu, 6 Mar 2014 10:44:52 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Jagdish Gedia <jvgediya@...il.com>
cc:	Peter Chen <Peter.Chen@...escale.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: USB remote wakeup through gpio interrupt

On Thu, 6 Mar 2014, Jagdish Gedia wrote:

> Hi Alan,
> 
> As you have told, i have executed pm_request_resume() function from my
> interrupt handler, and it is waking up my USB device. I have
> implemented all this functionality in class driver(cdc-acm.c).
> but what is happening is after 2-3 times, ausosuspend is getting
> disable for my device. I want autosuspend to be enabled for usb device
> forever. Do pm_request_resume function causes this behavior?

No.  The various versions of pm_runtime_get will cause it, though, if 
they aren't balanced by some form of pm_runtime_put.

Alan Stern

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