linux-kernel - Re: [PATCH 2/3] HID: usbhid: hid-core: submit queued urbs before suspend

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Date:	Wed, 14 Dec 2011 08:55:39 +0100
From:	Oliver Neukum <oneukum@...e.de>
To:	Daniel Kurtz <djkurtz@...omium.org>
Cc:	jkosina@...e.cz, bleung@...omium.org, stern@...land.harvard.edu,
	olofj@...omium.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/3] HID: usbhid: hid-core: submit queued urbs before suspend

Am Donnerstag, 17. November 2011, 12:23:49 schrieb Daniel Kurtz:
> Unfortunately, this usually happens while the first LED request is
> actually still being processed.  Thus when the completion handler tries
> to submit the second LED request it fails, since REPORTED_IDLE is
> already set!  This REPORTED_IDLE check failure causes the completion
> handler to complete, however without clearing the CTRL_RUNNING flag.
> This, in turn, means that the suspend() handler's wait_io() condition
> is never satisfied, and instead it times out after 10 seconds, aborting
> the original system suspend.
> 
> This patch changes the behavior to the following:
>   (1) allow completion handler to finish submitting all queued URBs, even if
>       REPORTED_IDLE is set.  This guarantees that all URBs queued before the
>       hid-core suspend() call will be submitted before the system is
>       suspended.

Hi,

why is this desirable? You'd want to requests to be executed at resumption.
A system suspend will alter the LED state anyway.

	Regards
		Oliver
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