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

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Message-ID: <20100411204002.6ba32f43@neptune.home>
Date:	Sun, 11 Apr 2010 20:40:02 +0200
From:	Bruno Prémont <bonbons@...ux-vserver.org>
To:	Jiri Kosina <jkosina@...e.cz>
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 April 2010 Jiri Kosina <jkosina@...e.cz> 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).

Am I right?

Thanks,
Bruno
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