linux-kernel - Re: [PATCH] forcedeth: Fix WARNINGS that result when DMA mapping is not checked

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Message-Id: <20121227.133209.1785109551425933956.davem@davemloft.net>
Date:	Thu, 27 Dec 2012 13:32:09 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	Larry.Finger@...inger.net, linville@...driver.com,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] forcedeth: Fix WARNINGS that result when DMA mapping
 is not checked

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 27 Dec 2012 13:03:29 -0800

> On Thu, 2012-12-27 at 14:38 -0600, Larry Finger wrote:
>> On 12/27/2012 02:05 PM, Eric Dumazet wrote:
>> > On Thu, 2012-12-27 at 13:42 -0600, Larry Finger wrote:
> 
>> >> +		if (pci_dma_mapping_error(np->pci_dev,
>> >> +					  np->put_tx_ctx->dma))
>> >> +			return NETDEV_TX_BUSY;
>> >
>> > Really this is not going to work very well : caller will call this in a
>> > loop.
>> 
>> Any suggestions on what value should be returned, or does the caller need to be 
>> modified?
> 
> NETDEV_TX_BUSY is really obsolete
> 
> Documentation/networking/driver.txt
> 
> In case of mapping error, I would drop the packet.

Agreed.
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