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Message-ID: <20090506064513.GA7460@kroah.com>
Date: Tue, 5 May 2009 23:45:13 -0700
From: Greg KH <greg@...ah.com>
To: Eric Valette <eric.valette@...e.fr>,
Larry Finger <Larry.Finger@...inger.net>
Cc: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
"John W. Linville" <linville@...driver.com>,
linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-usb@...r.kernel.org
Subject: Re: DMA debug trace pointing to rtl8187
On Wed, May 06, 2009 at 08:35:52AM +0200, Eric Valette wrote:
> FUJITA Tomonori wrote:
> > CC'ed linux-usb,
> >
> > The ehci_hcd driver uses buffers on the stack for DMA?
> >
> > 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.
>
> No that's the file path. I use ketchup to apply patches...
>
> >
> >> check_for_stack+0x6b/0x8b()
> >> Hardware name: P5W DH Deluxe
> >>
> >> ehci_hcd 0000:00:1d.7: DMA-API: device driver maps memory fromstack
> >> [addr=ffff88007fa79968]
> >> Modules linked in:
> >>
> >> Pid: 297, comm: khubd Not tainted 2.6.30-rc4-git1 #32
>
> Here is the real version.
The problem is in the rtl8187 driver.
They are calling usb_control_msg and passing a pointer to a buffer on
the stack. See drivers/net/wireless/rtl818x/rtl8187.h for where the
problem happens in numerous places.
Also it looks like rtl8225_write_8051() is incorrect. You are passing a
pointer to a variable that was passed as an argument. I don't know
where that is supposed to be on, somewhere on the stack I guess.
Larry, care to fix this up?
thanks,
greg k-h
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