netdev - RE: [PATCH net-next 06/10] amd-xgbe: Set DMA mask based on hardware register value

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Date:	Thu, 19 Mar 2015 17:32:58 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Tom Lendacky' <thomas.lendacky@....com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	David Miller <davem@...emloft.net>
Subject: RE: [PATCH net-next 06/10] amd-xgbe: Set DMA mask based on hardware
 register value

From: Tom Lendacky
> The hardware supplies a value that indicates the DMA range that it
> is capable of using. Use this value rather than hard-coding it in
> the driver.
...
> +	/* Translate the address width setting into actual number */
> +	switch (hw_feat->dma_width) {
> +	case 0:
> +		hw_feat->dma_width = 32;
> +		break;
> +	case 1:
> +		hw_feat->dma_width = 40;
> +		break;
> +	case 2:
> +		hw_feat->dma_width = 48;
> +		break;
> +	}
> +

I see a glaring problem should the hardware ever return 3.

	David