linux-kernel - Re: DMA debug trace pointing to rtl8187

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Message-ID: <20090506052120.GA6239@kroah.com>
Date:	Tue, 5 May 2009 22:21:20 -0700
From:	Greg KH <greg@...ah.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	eric.valette@...e.fr, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: DMA debug trace pointing to rtl8187

On Wed, May 06, 2009 at 01:30:47PM +0900, FUJITA Tomonori wrote:
> CC'ed linux-usb,
> 
> The ehci_hcd driver uses buffers on the stack for DMA?

No, it should not.

But USB drivers are known to do this incorrectly.  Those USB drivers
should be fixed.

> On Sun, 03 May 2009 17:36:24 +0200
> Eric Valette <eric.valette@...e.fr> wrote:
> 
> > ------------[ cut here ]------------
> > 
> > WARNING: at /usr/src/linux-2.6.22.9/lib/dma-debug.c:609
> 
> Hmm, the kernel version is wired. lib/dma-debug.c was added in
> 2.6.30-rc.

Very odd.  What specific kernel version caused this warning?

thanks,

greg k-h
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