linux-kernel - Re: [linux-pm] s2ram slow (radeon) / failing (usb)

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Date:	Tue, 4 May 2010 08:42:35 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	linux-pm@...ts.linux-foundation.org
Cc:	Bruno Prémont <bonbons@...ux-vserver.org>,
	Jiri Kosina <jkosina@...e.cz>, USB@...p1.linux-foundation.org,
	list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] s2ram slow (radeon) / failing (usb)

Am Montag, 3. Mai 2010 23:11:54 schrieb Bruno Prémont:
> [  477.543304] usb 1-2.1: usb_autosuspend_device: cnt 1 -> 0
> [  477.543316] usbhid 1-2.1:1.1: __pm_runtime_suspend()!
> [  477.543326] usbhid 1-2.1:1.1: __pm_runtime_suspend() returns 0!
> [  477.543380] usbcore: registered new interface driver usbhid
> [  477.549457] usbhid: USB HID core driver
> 
> And suspend is freezing inside of hid_cancel_delayed_stuff(usbhid) call
> from hid_suspend() in drivers/hid/usbhid/hid-core.c ...
> 
> Is it worth continuing iteration and adding further printk's down there?
> Jiri, what's your opinion on this?

Ugh. That looks like a bug in usbhid that I introduced. A fix is not trivial.
In short, I did not think the device could be undergoing a queued resumption
while suspend() is being called. I wonder why this is happening.

	Regards
		Oliver
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