linux-kernel - Re: [PATCH] ixp4xx_eth: set the device dma_coherent

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Date:	Tue, 19 Mar 2013 12:33:59 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	aeschlimann@...il.com
Cc:	khc@...waw.pl, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, c.aeschlimann@...-group.ch
Subject: Re: [PATCH] ixp4xx_eth: set the device dma_coherent_mask

From: Christophe Aeschlimann <aeschlimann@...il.com>
Date: Tue, 19 Mar 2013 16:59:25 +0100

> Without the mask it is impossible to take the network interface up
> since it returns the following error:
> 
>> net eth1: coherent DMA mask is unset
>> ifconfig: SIOCSIFFLAGS: Cannot allocate memory
> 
> Tested on an out-of-tree ixp425 based board.
> 
> Signed-off-by: Christophe Aeschlimann <c.aeschlimann@...-group.ch>
 ...
> @@ -1398,6 +1398,7 @@ static int eth_init_one(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	SET_NETDEV_DEV(dev, &pdev->dev);
> +	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);

Hmmm, shouldn't this be the default value, set by the bus layer or
similar?
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