linux-kernel - Re: Check if usb device is suspended

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Date:	Fri, 21 Mar 2014 14:22:20 +0100
From:	Oliver Neukum <oneukum@...e.de>
To:	Jagdish Gedia <jvgediya@...il.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Check if usb device is suspended

On Fri, 2014-03-21 at 17:17 +0530, Jagdish Gedia wrote:
> I want to resume the usb device on some event, so i want to check if
> it is suspended. I think by above method i can check if the device is
> already suspended, but may be i will miss to resume the device if it
> is suspending. Is there any way through which i can check if device is
> suspending?

Just don't do that. If a device needs to be awake for some operation,
call usb_autopm_get(). If the device is already awake, it is a nop
besides keeping the device awake.
Checking is not a sensible strategy.

	Regards
		Oliver


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