linux-kernel - Re: [PATCH v6 7/8, needs improvement] hid: add suspend/resume hooks for hid drivers

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Message-ID: <alpine.LNX.2.00.1004121342550.8345@pobox.suse.cz>
Date:	Mon, 12 Apr 2010 13:43:49 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Rick L. Vinyard Jr." <rvinyard@...nmsu.edu>,
	Nicu Pavel <npavel@...ner.com>,
	Oliver Neukum <oliver@...kum.org>
Subject: Re: [PATCH v6 7/8, needs improvement] hid: add suspend/resume hooks
 for hid drivers

On Sun, 11 Apr 2010, Bruno Prémont wrote:

> > > As far as I understand the code, in auto-suspend case if the driver 
> > > sends commands to the device it will have to call usbhid_wait_io(). 
> > > Please correct me if I'm wrong!
> > 
> > It's not needed. There is a queuing mechanism in place on 
> > 'resumption_waker' workqueue.
> 
> So the driver is not allowed to ask the device to do something
> at auto-suspend time (as that would abort the auto-suspension).

What do you mean by "is not allowed" exactly?

Yes, it will wake the device up from auto-suspension. However, that's 
usually what you want to happen, is there is anything you need to dispatch 
to the device, isn't it?

What exactly is the situation you are trying to handle?

Thanks,

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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