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

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Message-ID: <47AB33C4.7060501@openvz.org>
Date:	Thu, 07 Feb 2008 19:37:24 +0300
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	Alan Stern <stern@...land.harvard.edu>
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

Alan Stern wrote:
> 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.

Other tasks cannot wake this thread up since they do not
know the struct task_struct pointer.

> Alan Stern
> 
> 

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