netdev - Re: [patch 3/3] hci_usb.h: fix hard-to-trigger race

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Message-Id: <20080418142153.4e0eb83b.akpm@linux-foundation.org>
Date:	Fri, 18 Apr 2008 14:21:53 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Marcel Holtmann <marcel@...tmann.org>
Cc:	hidave.darkstar@...il.com, linux-bluetooth@...r.kernel.org,
	netdev@...r.kernel.org, pavel@....cz, pavel@...e.cz
Subject: Re: [patch 3/3] hci_usb.h: fix hard-to-trigger race

On Fri, 18 Apr 2008 23:10:12 +0200
Marcel Holtmann <marcel@...tmann.org> wrote:

> Hi Andrew,
> 
> > From: Pavel Machek <pavel@....cz>
> >
> > If someone tries to _urb_unlink while _urb_queue_head is running,  
> > he'll see
> > _urb->queue == NULL and fail to do any locking.  Prevent that from  
> > happening
> > by strategically placed barriers.
> 
> let me repeat this, the hci_usb driver is not worth fixing. Doing our  
> own URB handling is a bad idea. The btusb driver should fix all of  
> this. Only exception is that it is missing all the quirks, but that  
> was me being lazy.
> 

ok...  But as long as the old code is buildable and installable, we should
fix bugs in it?

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