linux-kernel - Re: [Patch net-next]atl1e:fix 2.6.31-git4 -- ATL1E 0000:03:00.0: DMA-API: device driver frees DMA

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Date:	Tue, 15 Sep 2009 23:57:21 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jie.yang@...eros.com
Cc:	miles.lane@...il.com, chris.snook@...il.com, jcliburn@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Patch net-next]atl1e:fix 2.6.31-git4 -- ATL1E 0000:03:00.0:
 DMA-API: device driver frees DMA

From: <jie.yang@...eros.com>
Date: Wed, 16 Sep 2009 14:21:53 +0800

> 
> [   25.059969] WARNING: at lib/dma-debug.c:816 check_unmap+0x383/0x55c()
> [   25.059976] Hardware name: 1000HE
> [   25.059984] ATL1E 0000:03:00.0: DMA-API: device driver frees DMA
>     memory with wrong function [device address=0x0000000036b92802] 
>     [size=90 bytes] [mapped as single] [unmapped as page]
> 
> use the wrong API when free dma. So when map dma use a flag to demostrate
> whether it is 'pci_map_single' or 'pci_map_page'. When free the dma, check
> the flags to select the right APIs('pci_unmap_single' or 'pci_unmap_page').
>  
> Signed-off-by: Jie Yang <jie.yang@...eros.com>

An 'unsigned long' is an enormous type to use just to store
3 bits of information.  Use a u16 or similar to compact the
size of struct atl1e_tx_buffer

Also, it looks terribly ugle to define the flag macros, some with
three leading zeros in the hexadecimal values and one without.

Please make them consistent, thanks.

Generally, I see that this change was put together very hastily
and without very much care.
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