On Thu, May 3, 2012 at 4:31 AM, Hans Petter Selasky <hsela...@c2i.net> wrote:
> On Wednesday 02 May 2012 21:15:27 Tim Roberts wrote:
>> Hans Petter Selasky wrote:
>> > Why Microsoft can't use the BSD or Linux USB stack then, which supports
>> > all of this. Sounds like very bad internal USB design to me!
>>
>> Oh, please.  The Microsoft internal USB design is fine, and kernel
>> drivers can do ALL of the things in that post.  The restrictions
>> mentioned in that list apply to WinUSB, which is the user-mode wrapper.
>
> In the answers from the Microsoft guy, there were some arguments about
> security. Many kind of device drivers could have been made more secure by
> moving out of the kernel, for example webcam drivers, which is a class of
> devices which are especially using a lot of isochronous endpoints. The use
> case is there for sure, but probably nobody saw it.

I've seen many arguments about user space driver versus kernel
space driver but I do not sell a very clear conclusions, for example
on the webcam drivers. I see that Linux and Windows use
kernel space driver for them. Do you think libusb based
user space driver is good for USB Webcam?

-- 
Xiaofan

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