Re: DMA debug trace pointing to rtl8187

Greg KH
2009-05-06T06:42:40Z

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@free.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