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Date: Fri, 14 May 2010 13:25:48 +0200
From: Joerg Roedel <joro@8bytes.org>
To: Zdenek Kabelac <zdenek.kabelac@gmail.com>
Cc: olivier.grenie@dibcom.fr,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       jslaby@suse.cz
Subject: Re: WARNING: at lib/dma-debug.c:866 check_for_stack
Message-ID: <20100514112548.GD510@8bytes.org>
References: <AANLkTikyx2eaxaiUCFDSfpmn1UG0t2GOxArz6F4wp1LJ@mail.gmail.com>
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On Fri, May 14, 2010 at 10:56:46AM +0200, Zdenek Kabelac wrote:
> I've noticed my dvb-t tuner reports this Warning about stack usage for DMA.
> Is there some fix already available ?

int dib0700_identify_state(struct usb_device *udev, struct dvb_usb_device_properties *props,
                        struct dvb_usb_device_description **desc, int *cold)
{
        u8 b[16];
        s16 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev,0),
                REQUEST_GET_VERSION, USB_TYPE_VENDOR | USB_DIR_IN, 0, 0, b, 16, USB_CTRL_GET_TIMEOUT);

	...
}

The variable b is on the stack and used as the usb transfer buffer. This
should be easy to fix.

	Joerg