linux-kernel - Re: [PATCH] check for allocation failure in ioat_dma_self

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Message-ID: <20130304101142.GJ17833@n2100.arm.linux.org.uk>
Date:	Mon, 4 Mar 2013 10:11:42 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Andrew Cooks <acooks@...il.com>
Cc:	Dan Williams <djbw@...com>, Vinod Koul <vinod.koul@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Jassi Brar <jassisinghbrar@...il.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] check for allocation failure in ioat_dma_self_test

On Mon, Mar 04, 2013 at 04:39:16PM +0800, Andrew Cooks wrote:
> diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
> index 1879a59..1f706c4 100644
> --- a/drivers/dma/ioat/dma.c
> +++ b/drivers/dma/ioat/dma.c
> @@ -832,7 +832,18 @@ int ioat_dma_self_test(struct ioatdma_device *device)
>  	}
>  
>  	dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
> +	err = dma_mapping_error(dev, dma_src);
> +	if (err) {
> +		dev_err(dev, "dma mapping failed: -%d\n", err);
> +		goto free_resources;
> +	}

NAK.  Please take the time to check what the functions you're using return
rather than assuming what they return.
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