Re: [Libusb-devel] usb_interrupt_read

[Tim R. <ti...@pr...>]

Mar...@om... wrote:

>Hello !
>
>I found the problem with usb_interrupt_read. I passed 16 bytes buffer to
>the function which results in a -EINVAL at kernel 2.4.27. If only 8 Bytes
>are passed it works fine with 2.4.27 and 2.6.8.
>  
>

Is this a low-speed device?  Interrupt pipes on low speed devices can
only handle 8 bytes per transfer.  It's possible that the 2.4.27 kernel
is not capable of chopping a request up into packet-sized chunks.

I do have to say that, although I am a Linux advocate, USB support is
perhaps the one key subsystem where Windows clearly has Linux beat all
to heck.  USB on Windows has been rock solid for 7 or 8 years, and I'm
still seeing flakiness in Linux even on a 2.6.10 kernel.

-- 
Tim Roberts, ti...@pr...
Providenza & Boekelheide, Inc.