linux-kernel - RE: [PATCH v12 4/8] usb:gadget: Add SuperSpeed support to the Gadget Framework

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Date:	Tue, 24 May 2011 08:37:43 +0300
From:	"Tanya Brokhman" <tlinder@...eaurora.org>
To:	"'Mike Frysinger'" <vapier@...too.org>
Cc:	"'Sebastian Andrzej Siewior'" <bigeasy@...utronix.de>,
	<greg@...ah.com>, <linux-usb@...r.kernel.org>,
	<linux-arm-msm@...r.kernel.org>, <balbi@...com>,
	<ablay@...eaurora.org>,
	"'open list'" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v12 4/8] usb:gadget: Add SuperSpeed support to the Gadget Framework

> >
> > Mike answered that you're right in your observation. I'm not familiar
> with
> > blackfin. Could you please elaborate on this? I understand that I
> need to
> > use put_unaligned_le16(), will do, but I would like to better
> understand why
> > and if there is a way to test this so that blackfin won't be broken.
> 
> not all arches support unaligned accesses.  or they do, but it's done
> via (non-trivial) exception processing in software.  req->buf is of
> type void* and so presumably is not guaranteed to be aligned on a 2
> byte boundary.
> -mike

Thanks for the explanation, Mike! I'll update the patch.

Best regards,
Tanya Brokhman
Consultant for Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum




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