On Sat, 7 Jan 2006 [EMAIL PROTECTED] wrote:
> Hi,
>
> What porblems could I face if I use more of usb_bulk_msg, i.e USB
> transfers without URBs ..
There aren't any problems with usb_bulk_msg. But there are some
disadvantages:
You can't unlink an URB if you want to cancel it before the
timeout has expired.
It has to allocate an URB dynamically each time you call it.
You can't allocate a single URB and then simply use it over
and over again.
If you're going to use the same transfer buffer many times,
you can't set up a DMA mapping for it.
On the other hand, using usb_bulk_msg is very simple and involves writing
less code than using your own URBs.
Alan Stern
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