Dave:
While trying to test some changes to the ISO handling in uhci-hcd, I ran
across a whole mess of bugs.
Easy one first: The ISO tests in usbtest don't report
errors! test_iso_queue() will return 0 even if all the
URBs fail. Not so good for testing purposes.
Intermediate ones: In inode.c, ep_aio_complete() assumes
that iocb->ki_retry will be set for reads and will be NULL
for writes. But it isn't; the aio core sets default values
for ki_retry always.
Even when that is fixed, the call to kick_iocb() (in the same
routine) doesn't seem to do anything. ep_aio_read_retry()
does not get invoked and the pending aio requests never
terminate.
Hard one: When DMA is enabled in net2280, the first ISO
request submitted by the gadget driver (an IN transfer)
completes immediately. Even though the host hasn't tried
to do any I/O. When DMA is disabled this doesn't happen.
I might be able to work on the aio problem, except that I have no idea how
the kernel's aio facility is meant to work. Is there any documentation
for it?
Alan Stern
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