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

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Date:	Sun, 21 Aug 2011 03:18:34 -0700 (PDT)
From:	"Amit Blay" <ablay@...eaurora.org>
To:	"Sarah Sharp" <sarah.a.sharp@...ux.intel.com>
Cc:	"Amit Blay" <ablay@...eaurora.org>,
	"Hans Petter Selasky" <hselasky@....net>,
	"Tatyana Brokhman" <tlinder@...eaurora.org>, greg@...ah.com,
	linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	balbi@...com, "Amit Blay" <ablay@...lcomm.com>,
	"open list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RFC 5/5] usb: Add support for streams alloc/dealloc to 
     devio.c

Thanks Sarah, Hans for your comments,

On Thu, August 18, 2011 3:47 pm, Sarah Sharp wrote:

> Yes, I think this is the correct solution.  Sorry for taking so long to
> get back to you.

OK, so I will go ahead with implementing this solution.

> On Wed, Aug 17, 2011 at 09:06:03AM +0200, Hans Petter Selasky wrote:
>> I would suggest overloading the "unsigned int pipe", instead of breaking
>> existing API's by adding a new stream ID value. Also for LibUSB.

The purposed solution will not break any existing API, by doing the
following:
a. Adding a new API for streams alloc/dealloc
b. Adding a new API for submitting a URB which is stream capable (I will
implement this in a separate patch).

> I don't see this as a strong argument why we should arbitrarily limit a
> new API.  It's very hard to deprecate kernel to userspace API, so I
> think we should do it right the first time.  There are current
> applications (like an SSD behind a UAS device) that need as many
> concurrent streams in flight as possible, so I don't buy the argument
> that there aren't current applications that need that many streams.

I agree with Sarah.
Hans, I appreciate your inputs. Please let me know if you see a good
reason why not implementing the new APIs purposed above for streams
allocation and usage. Otherwise I will go ahead with the implementation.

Thanks,
Amit.

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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