netdev - Re: Problem with non aligned DMA in usbnet on ARM

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Date:	Thu, 12 Aug 2010 19:01:20 +0200
From:	Matthieu CASTET <matthieu.castet@...rot.com>
To:	"mfuzzey@...il.com" <mfuzzey@...il.com>
CC:	Greg KH <greg@...ah.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-usb <linux-usb@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, <fchen@....com>
Subject: Re: Problem with non aligned DMA in usbnet on ARM

Martin Fuzzey a écrit :
> Greg KH wrote:
>> Can you fix this in the host controller driver?
>>
>>   
> Technically yes (by copying the unaligned buffers).
> 
> But if we do decide that USB must support unaligned buffers wouldn't it
> be better to have the HCD indicate it's alignment requirement to the
> core and have the core do the copying?
> 
> Gary King sent a message to this thread but only to the arm list saying
> he has the same problem with the tegra hcd (which doesn't seem to be in
> the tree yet.)  I don't know if any of the other in tree HCDs have this
> problem.
dwc otg also got this limitation. I don't know if the version submitted 
for inclusion handle unaligned buffers.


Matthieu
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