linux-kernel - Re: [patch 14/71] USB: EHCI: use the new clear_tt

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Date:	Wed, 29 Jul 2009 07:03:08 -0700
From:	Greg KH <gregkh@...e.de>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk
Subject: Re: [patch 14/71] USB: EHCI: use the new clear_tt_buffer interface

On Wed, Jul 29, 2009 at 09:56:31AM -0400, Alan Stern wrote:
> On Tue, 28 Jul 2009, Greg KH wrote:
> 
> > 2.6.30-stable review patch.  If anyone has any objections, please let us know.
> > 
> > ------------------
> > 
> > From: Alan Stern <stern@...land.harvard.edu>
> > 
> > commit 914b701280a76f96890ad63eb0fa99bf204b961c upstream.
> > 
> > This patch (as1256) changes ehci-hcd and all the other drivers in the
> > EHCI family to make use of the new clear_tt_buffer callbacks.  When a
> > Clear-TT-Buffer request is in progress for a QH, the QH is not allowed
> > to be linked into the async schedule until the request is finished.
> > At that time, if there are any URBs queued for the QH, it is linked
> > into the async schedule.
> 
> Greg, can we hold off on applying this patch to the stable tree?
> 
> It turns out that this change causes a WARN_ON to trigger in some 
> circumstances, and the proposed patch to fix _that_ hasn't yet been 
> submitted to the mainline because a few people have reported that it 
> leaks DMA pool memory.  So far there hasn't been much progress in 
> tracking this down.

Sure, I'll drop it.  Should I also drop the patch before this one as
well, which was there only because this patch needed it?

Let me know when/if you ever want it added to the -stable trees in the
future.

thanks,

greg k-h
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