linux-kernel - Re: [PATCH 3/4] dpaa_eth: change device used

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Date:   Wed, 11 Oct 2017 14:02:03 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     madalin.bucur@....com
Cc:     netdev@...r.kernel.org, f.fainelli@...il.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, junote@...look.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] dpaa_eth: change device used

From: Madalin Bucur <madalin.bucur@....com>
Date: Tue, 10 Oct 2017 17:10:17 +0300

> @@ -2696,7 +2681,13 @@ static int dpaa_eth_probe(struct platform_device *pdev)
>  	int err = 0, i, channel;
>  	struct device *dev;
>  
> -	dev = &pdev->dev;
> +	/* device used for DMA mapping */
> +	dev = pdev->dev.parent;
> +	err = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(40));
> +	if (err) {
> +		dev_err(dev, "dma_coerce_mask_and_coherent() failed\n");
> +		goto dev_mask_failed;
> +	}
>  
>  	/* Allocate this early, so we can store relevant information in
>  	 * the private area

Since you are moving this code up before the netdev allocation, you must
adjust the failure path goto label used.

Your change as-is will cause an OOPS because we'll pass a NULL pointer
to free_netdev().