netdev - Re: [patch] usbnet: fix 100% CPU use on suspended device

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Message-ID: <Pine.LNX.4.44L0.1007261106350.1550-100000@iolanthe.rowland.org>
Date:	Mon, 26 Jul 2010 11:13:23 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Elly Jones <ellyjones@...gle.com>,
	Oliver Neukum <oliver@...kum.org>
cc:	David Miller <davem@...emloft.net>, <netdev@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: [patch] usbnet: fix 100% CPU use on suspended device

On Mon, 26 Jul 2010, Elly Jones wrote:

> > This isn't right.  The problem should be fixed some other way.  Under
> > what circumstances are URBs submitted incorrectly?
> 
> When the device is autosuspended. What is the proper thing for a
> device to do here?

>From looking at the code, it appears that the EVENT_DEV_ASLEEP flag
should be tested in usbnet_bh() the way it is in rx_submit().  But I'm
not an expert on usbnet; we should ask someone who is, like Oliver.

Alan Stern

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