linux-kernel - Re: [PATCH][USBATM]: convert heavy init dances to kthread API

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Message-ID: <Pine.LNX.4.44L0.0802071116360.4128-100000@iolanthe.rowland.org>
Date:	Thu, 7 Feb 2008 11:18:12 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Pavel Emelyanov <xemul@...nvz.org>
cc:	Duncan Sands <baldrick.bulk@...e.fr>, <linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][USBATM]: convert heavy init dances to kthread API

On Thu, 7 Feb 2008, Pavel Emelyanov wrote:

> > Does the kthread API guarantee that the kthread is not running until you call
> 
> It does. That's why the race, you mentioned above is impossible.

That is wrong.  The API guarantees only that the kthread is initially 
created in a non-running state.  It cannot guarantee that no other 
task will wake up the kthread before the caller does.

Alan Stern

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