Re: [linux-usb-devel] queueing URBs?

[David Brownell]

> Now with queued URBs:
> 
> - Submit a chain (URB_1, URB_2) immediately to the HCD
>    /* I think we still need to submit both URBs seperately? */

Certainly each "submit" can report errors immediately ... which
is why I don't quite know what it should mean to submit the
had of a list of bulk URBs linked by urb->next where all have
USB_QUEUE_BULK set.

If urb1 submits OK, and submitting urb2 gets an error, what
then?  Tough to report the error immediately since urb1 may
have done its work already.


> - than the HC handles the transfer (URB_1)
> - than the HC handles the next transfer (queued URB_2)
> \ at the same time HCD looks at the ->next pointer of URB_1
>   (it points to URB_2) but URB_2 is still queued so what now????? 

Maybe if USB_QUEUE_BULK is set on an urb, any 
automagic urb->next handling on completion should be
bypassed ... unless usb_submit_urb() couldn't submit
that urb->next successfully.

- Dave



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