Adam Kropelin wrote:
Alan Stern wrote:
On Thu, 2 Jun 2005, Adam Kropelin wrote:
It would certainly help to know exactly where the blockage occurs. Is
it in the HID queuing code, in the HCD (unlikely), or in the UPS
device? Suitable debugging statements ought to settle that pretty
easily.
Yes, that's a crucial detail we need to establish. My money is on the
UPS device, but we should find out for sure. I don't know my way around
the Linux USB stack very well, but I presume I can find a spot in the
HCD to printk URBs as they hit the wire and responses as they come
back.
I would start by adding printks to hid-core.c.
From existing hid-core.c debug I can already see a ctrl urb being
submitted via usb_submit_urb() and no corresponding completion coming
back via hid_ctrl(). So, unless I'm overlooking something, I think the
hid-core layer is covered.
If you still want to see
all URBs as they are submitted and as they complete, search in
drivers/usb/core/hcd.c for usbmon_urb_submit and usbmon_urb_complete.
You can put your printks there, or just use the usbmon facility.
Pete suggested usbmon and I'm planning to give that a try as soon as
time permits. Unfortunately I can't duplicate the problem myself so
I'm relying on the afflicted users to send debug traces. Sticking in a
printk might be a quicker way for Martin and Christian to get infoif
usbmon is proving troublesome. How's it going, guys?
--Adam
Any activity? I asked a few days ago what exactly you want me test but
haven't gotten a reply so far. 2.6.11 does not have this usbmon to start
with ;-) In a few day I have to ship my equipment to its permanent
installation site and won't be able to test much anymore.
Martin
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