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

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Message-ID: <1356642209.30414.1411.camel@edumazet-glaptop>
Date:	Thu, 27 Dec 2012 13:03:29 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	linville@...driver.com, davem@...emloft.net,
	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

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.

(kfree_skb() it, increment a device tx_dropped counter,  and return
NETDEV_TX_OK)



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