hi,
I'm reading latest usb_skeleton.c sample and compared with that with ldd3 book.
Looks like the skel_read changed a lot against previous version. Why we now not
use usb_bulk_msg, just due to we want to get chance to cancel the urb if any
unexpected exit?
Also in current skel_read function, I am a bit confused by the "retry" logic,
why do we need this? Especially, when the var - available would equal to zero
and makes the judegment if (!available) true?
Another small quesiton is about :
/*
* if we are asked for more than we have,
* we start IO but don't wait
*/
if (available < count)
skel_do_read_io(dev, count - chunk); // <- why don't we
judge the return value for this calling?
Appreciated if anyone can make me clear, thanks in adv.
