linux-kernel - Re: [PATCH] [media] dib0700: get rid of on-stack dma buffers

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Message-ID: <20110306150057.0e1fd078@schatten.dmk.lab>
Date:	Sun, 6 Mar 2011 15:00:57 +0100
From:	Florian Mickler <florian@...kler.org>
To:	Jack Stone <jwjstone@...tmail.fm>
Cc:	mchehab@...radead.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <greg@...ah.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Maciej Rutecki <maciej.rutecki@...il.com>
Subject: Re: [PATCH] [media] dib0700: get rid of on-stack dma buffers

On Sun, 06 Mar 2011 13:49:56 +0000
Jack Stone <jwjstone@...tmail.fm> wrote:

> On 06/03/2011 11:16, Florian Mickler wrote:
> > This should fix warnings seen by some:
> > 	WARNING: at lib/dma-debug.c:866 check_for_stack
> > 
> > Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=15977.
> > Reported-by: Zdenek Kabelac <zdenek.kabelac@...il.com>
> > Signed-off-by: Florian Mickler <florian@...kler.org>
> > CC: Mauro Carvalho Chehab <mchehab@...radead.org>
> > CC: linux-media@...r.kernel.org
> > CC: linux-kernel@...r.kernel.org
> > CC: Greg Kroah-Hartman <greg@...ah.com>
> > CC: Rafael J. Wysocki <rjw@...k.pl>
> > CC: Maciej Rutecki <maciej.rutecki@...il.com>
> > ---
> > @@ -101,8 +109,19 @@ int dib0700_ctrl_rd(struct dvb_usb_device *d, u8 *tx, u8 txlen, u8 *rx, u8 rxlen
> >  
> >  int dib0700_set_gpio(struct dvb_usb_device *d, enum dib07x0_gpios gpio, u8 gpio_dir, u8 gpio_val)
> >  {
> > -	u8 buf[3] = { REQUEST_SET_GPIO, gpio, ((gpio_dir & 0x01) << 7) | ((gpio_val & 0x01) << 6) };
> > -	return dib0700_ctrl_wr(d, buf, sizeof(buf));
> > +	s16 ret;
> > +	u8 *buf = kmalloc(3, GFP_KERNEL);
> > +	if (!buf)
> > +		return -ENOMEM;
> > +
> > +	buf[0] = REQUEST_SET_GPIO;
> > +	buf[1] = gpio;
> > +	buf[2] = ((gpio_dir & 0x01) << 7) | ((gpio_val & 0x01) << 6);
> > +
> > +	ret = dib0700_ctrl_wr(d, buf, sizeof(buf));
> 
> Shouldn't this sizeof be changed as well?
> 
> Thanks,
> 
> Jack

argh... indeed. 
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