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Date: Thu, 11 Dec 2014 10:06:46 +0800
From: Kevin Hao <haokexin@...il.com>
To: David Miller <davem@...emloft.net>
Cc: claudiu.manoil@...escale.com, netdev@...r.kernel.org
Subject: Re: [PATCH net] gianfar: Fix dma check map error when DMA_API_DEBUG
is enabled
On Wed, Dec 10, 2014 at 01:13:47PM -0500, David Miller wrote:
> From: Claudiu Manoil <claudiu.manoil@...escale.com>
> Date: Tue, 9 Dec 2014 16:24:35 +0200
>
> > From: Kevin Hao <haokexin@...il.com>
> >
> > We need to use dma_mapping_error() to check the dma address returned
> > by dma_map_single/page(). Otherwise we would get warning like this:
> ...
> > For TX, we need to unmap the pages which has already been mapped and
> > free the skb before return. For RX, just let the rxbdp as unempty.
> > We can retry to initialize it to empty in next round.
> >
> > Signed-off-by: Kevin Hao <haokexin@...il.com>
> > Signed-off-by: Claudiu Manoil <claudiu.manoil@...escale.com>
>
> The RX behavior needs to be adjusted.
>
> You should never leave holes in the RX ring, ever.
>
> Instead, try allocating the new RX skb first, and only if
> you are successful should you pass up the original SKB. If
> it fails, then reuse the original SKB in the RX ring.
OK, will do.
Thanks,
Kevin
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