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

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Date:	Tue, 19 Oct 2010 15:26:05 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Vasiliy Kulikov <segooon@...il.com>
Cc:	kernel-janitors@...r.kernel.org,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma: imx-dma: fix signedness bug

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.
drivers/dma/imx-dma.c: In function 'imxdma_probe':
drivers/dma/imx-dma.c:324: warning: 'ret' may be used uninitialized in
this function

--
Dan
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