netdev - Re: [PATCH net] bnx2x: fix DMA unmapping of TSO split BDs

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Date:	Thu, 09 Jan 2014 09:52:03 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Michal Schmidt <mschmidt@...hat.com>
Cc:	netdev@...r.kernel.org, Ariel Elior <ariele@...adcom.com>,
	Yuval Mintz <yuvalmin@...adcom.com>,
	Dmitry Kravkov <dmitry@...adcom.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH net] bnx2x: fix DMA unmapping of TSO split BDs

On Thu, 2014-01-09 at 14:36 +0100, Michal Schmidt wrote:
> bnx2x triggers warnings with CONFIG_DMA_API_DEBUG=y:
> 
>   WARNING: CPU: 0 PID: 2253 at lib/dma-debug.c:887 check_unmap+0xf8/0x920()
>   bnx2x 0000:28:00.0: DMA-API: device driver frees DMA memory with
>   different size [device address=0x00000000da2b389e] [map size=1490 bytes]
>   [unmap size=66 bytes]
> 
> The reason is that bnx2x splits a TSO BD into two BDs (headers + data)
> using one DMA mapping for both, but it uses only the length of the first
> BD when unmapping.
> 
> This patch fixes the bug by unmapping the whole length of the two BDs.
> 
> Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
> ---

Reviewed-by: Eric Dumazet <edumazet@...gle.com>


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