netdev - Re: [PATCH] net/usb: rtl8150: allocate URB transfer_buffer and setup

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Date:	Thu, 08 Aug 2013 22:43:16 +0300
From:	Jussi Kivilinna <jussi.kivilinna@....fi>
To:	Petko Manolov <petkan@...leusys.com>
CC:	netdev@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] net/usb: rtl8150: allocate URB transfer_buffer and setup_packet
 separately

On 08.08.2013 18:14, Petko Manolov wrote:
> On Wed, 7 Aug 2013, Jussi Kivilinna wrote:
> 
>> rtl8150 allocates URB transfer_buffer and setup_packet as part of same 
>> structure 'struct async_req'. This can cause same cacheline to be 
>> DMA-mapped twice with same URB. This can lead to memory corruption on 
>> some systems.
> 
> I can see performance impact due to the double mapping.  However, memory 
> corruption seems a bit too much for sane cache and DMA controllers.  Out 
> of interest - which is the architecture that will potentially corrupt the 
> memory.

rtlwifi driver had similar structure to allocate both setup_packet and transfer_buffer in single go (overlapping dma-mapping cachelines) and this caused problems on ARM/sunxi. Problems means: memory corruptions at random locations, device freezes and lock-ups.

-Jussi

> 
> 
> cheers,
> Petko
> 

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