netdev - Re: [PATCH v3] net: mv643xx_eth: Fix highmem support in non-TSO egress path

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Date:	Mon, 26 Jan 2015 16:15:14 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	ezequiel.garcia@...e-electrons.com
Cc:	linux@....linux.org.uk, netdev@...r.kernel.org,
	B38611@...escale.com, fabio.estevam@...escale.com,
	David.Laight@...LAB.COM
Subject: Re: [PATCH v3] net: mv643xx_eth: Fix highmem support in non-TSO
 egress path

From: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Date: Thu, 22 Jan 2015 11:33:02 -0300

> Commit 69ad0dd7af22b61d9e0e68e56b6290121618b0fb
> Author: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
> Date:   Mon May 19 13:59:59 2014 -0300
> 
>     net: mv643xx_eth: Use dma_map_single() to map the skb fragments
> 
> caused a nasty regression by removing the support for highmem skb
> fragments. By using page_address() to get the address of a fragment's
> page, we are assuming a lowmem page. However, such assumption is incorrect,
> as fragments can be in highmem pages, resulting in very nasty issues.
> 
> This commit fixes this by using the skb_frag_dma_map() helper,
> which takes care of mapping the skb fragment properly. Additionally,
> the type of mapping is now tracked, so it can be unmapped using
> dma_unmap_page or dma_unmap_single when appropriate.
> 
> This commit also fixes the error path in txq_init() to release the
> resources properly.
> 
> Fixes: 69ad0dd7af22 ("net: mv643xx_eth: Use dma_map_single() to map the skb fragments")
> Reported-by: Russell King <rmk+kernel@....linux.org.uk>
> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>

Applied, thanks.
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