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On Oct 4, 2004, at 8:59 AM, Jason Thorpe wrote:

> I seem to recall that there are some patches floating around that fix 
> this problem.  It's not that contiguous memory is actually required, 
> it is simply that our umass driver is (incorrectly) written that way.

Specifically...

The usb_allocmem() function tries to allocate a single block of memory 
(rounded to USB_MEM_BLOCK [4096]) if the requested size is > 
USB_MEM_SMALL [64].  In the case of umass, it's requesing 
UMASS_MAX_TRANSFER_SIZE [MAXPHYS, 64K].

What needs to happen here is that usb_allocmem(), or 
usb_block_allocmem(), needs to learn to chunk up the memory if it is 
unable to allocate it contiguously.

         -- Jason R. Thorpe <thorpej@shagadelic.org>


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