linux-kernel - Re: [PATCH/RFC 5/5] usb: Add support for streams alloc/dealloc to devio.c

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Message-ID: <Pine.LNX.4.44L0.1106171033320.2143-100000@iolanthe.rowland.org>
Date:	Fri, 17 Jun 2011 10:35:32 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	ablay@...eaurora.org
cc:	Greg KH <greg@...ah.com>, Felipe Balbi <balbi@...com>,
	Tatyana Brokhman <tlinder@...eaurora.org>,
	<linux-usb@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC 5/5] usb: Add support for streams alloc/dealloc to 
     devio.c

On Fri, 17 Jun 2011 ablay@...eaurora.org wrote:

> My name is Amit Blay, I'm working with Tatyana Brokhman, I originally
> created this patch. I want to make sure I understand the solution:
> 
> We will create a new IOCTL, i.e., USBDEVFS_SUBMITURB_SS. This IOCTL will
> pass new URB structure, usbdevfs_urb_ss, which will hold the "legacy" URB
> and in addition the stream_id. libusb will be able to use the new ABI
> whenever SuperSpeed streams are required.
> 
> Is this correct?

This probably should be USBDEVFS_SUBMITURB_STREAM, since it is necesary
only for URBs that use bulk streaming rather than for all SuperSpeed
URBs.

Alan Stern

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