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

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Date:	Wed, 29 Jul 2009 09:56:31 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Greg KH <gregkh@...e.de>
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 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.

Alan Stern

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