Am Freitag, 15. April 2005 19:38 schrieb David Brownell:
> > IMHO the best way to reduce times is to move all memory
> > allocations into urb allocation.
>
> That's an approach I've thought about. Unfortunately it's costs an invasive
> API change: passing the device (or better yet, usb_host_endpoint) into
> the URB allocation. Though to clarify: that would affect allocation of
> TDs and any urb-private data, not the data buffers. Something like
>
> usb_urb_alloc(usb_host_endpoint *ep, // hook to HCD
> size_t maxbuf, // ... for prealloc of N TDs
> unsigned n_iso,
> unsigned gfp_flags);
>
It is pretty straightforward a change. Auditing locking in all drivers is not.
Switching to tasklets would result in revisting locking in drivers.
Regards
Oliver
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