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

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Date:	Wed, 11 Aug 2010 08:04:43 -0700
From:	Greg KH <greg@...ah.com>
To:	Martin Fuzzey <mfuzzey@...il.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-usb <linux-usb@...r.kernel.org>, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Problem with non aligned DMA in usbnet on ARM

On Wed, Aug 11, 2010 at 12:11:52PM +0200, Martin Fuzzey wrote:
> > You haven't said what HCD you're using.
> >
> imx21_hcd  (submitted by me and mainlined in 2.6.34)
> 
> > In that case, I'd say the HCD must handle misaligned URBs itself so
> > behaviour is consistent between all implementations on different
> > platforms.
> >
> Here is a pointer to the thread where it was stated that HCD's don't
> have to handle this.
> 
> http://kerneltrap.org/mailarchive/linux-usb/2009/4/20/5528164

No, that thread is about stack vs. heap allocations, not about alignment
issues.

thanks,

greg k-h
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