linux-kernel - Re: [PATCH] dma: imx-dma: fix signedness bug

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Message-ID: <20101020063542.GD28242@pengutronix.de>
Date:	Wed, 20 Oct 2010 08:35:42 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Vasiliy Kulikov <segooon@...il.com>,
	kernel-janitors@...r.kernel.org,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma: imx-dma: fix signedness bug

On Tue, Oct 19, 2010 at 03:26:05PM -0700, Dan Williams wrote:
> On Sun, Oct 17, 2010 at 7:51 AM, Vasiliy Kulikov <segooon@...il.com> wrote:
> > mxdmac->channel was unsigned, so check (imxdmac->channel < 0) for
> > failed imx_dma_request_by_prio() made no sence.  Explicitly check
> > signed values.
> >
> > Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
> > ---
> >  drivers/dma/imx-dma.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
> > index 346be62..75d870f 100644
> > --- a/drivers/dma/imx-dma.c
> > +++ b/drivers/dma/imx-dma.c
> > @@ -335,7 +335,7 @@ static int __init imxdma_probe(struct platform_device *pdev)
> >
> >                imxdmac->imxdma_channel = imx_dma_request_by_prio("dmaengine",
> >                                DMA_PRIO_MEDIUM);
> > -               if (imxdmac->channel < 0)
> > +               if ((int)imxdmac->channel < 0)
> >                        goto err_init;
> 
> Should this be:
> 
>                if ((int)imxdmac->channel < 0) {
>                        ret = -ENODEV;
>                        goto err_init;
>                }
> 
> ...because I get the following in my compilation tests.

Yes, ret is clearly used uninitialized. I wonder why my gcc-4.3.2 compiler
does not warn me about this :(

Sascha

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