David Brownell wrote:
> Seeing an undending stream of interrupts reported is odd,
> and given that I saw it with OHCI when the unit wasn't
> even plugged in any more ... it feels like there's a bug
> somewhere outside the {U,O}HCI code that's somehow been
> tweaked. Or else the *HCI code is starting to get more
> compatible (bug-for-bug :-) than we anticipated!
I first noticed this last night, with a minimal USB tree, using UHCI
controller. A little more checking of the kernel logs showed this:
Apr 9 17:54:20 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
180
Apr 9 17:54:20 zhora kernel: hub.c: already running port 3 disabled by
hub (EMI?), re-enabling...
Apr 9 17:54:20 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
204
Apr 9 17:54:20 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
228
Apr 9 17:54:20 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
252
Apr 9 17:54:21 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
276
Apr 9 17:54:21 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
300
Apr 9 17:54:21 zhora kernel: usb.c: USB disconnect on device 5
Apr 9 17:54:21 zhora kernel: usb.c: USB disconnect on device 6
Apr 9 17:54:21 zhora kernel: usb.c: USB disconnect on device 8
Apr 9 17:54:21 zhora kernel: usb.c: USB disconnect on device 7
Apr 9 17:54:21 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
324
I have a lot of these, and the "hub.c: already running port 3 disabled
by hub (EMI?), re-enabling..." section is almost always there.
Another potentially important section is this:
Apr 11 23:05:46 zhora kernel: hub.c: nonzero status in irq -84
Apr 11 23:05:47 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
960
Apr 11 23:05:47 zhora kernel: hub.c: nonzero status in irq -84
Apr 11 23:05:47 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
1344
Apr 11 23:05:47 zhora kernel: hub.c: nonzero status in irq -84
Apr 11 23:05:47 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
1728
Apr 11 23:05:47 zhora kernel: hub.c: nonzero status in irq -84
Apr 11 23:05:48 zhora kernel: usb-uhci.c: interrupt, status 3, frame# 64
Apr 11 23:05:48 zhora kernel: hub.c: nonzero status in irq -84
Apr 11 23:05:48 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
448
Apr 11 23:05:48 zhora kernel: hub.c: nonzero status in irq -84
Apr 11 23:05:48 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
832
Apr 11 23:05:48 zhora kernel: hub.c: nonzero status in irq -84
Apr 11 23:05:49 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
1216
Apr 11 23:05:49 zhora kernel: hub.c: nonzero status in irq -84
Apr 11 23:05:49 zhora kernel: usb-uhci.c: interrupt, status 3, frame#
1600
This is only once, and this is the time I noticed it. Lots and lots of
messages, only stopping on reboot.
It looks like the hub in my bus powered keyboard (which is a TI one, I
think) is switching off the downstream connection to the self-powered
hub (also a TI one), and then restarting.
BTW: The trigger last night was plugging in a KLSI ethernet connector
dongle to the self-powered hub.
Brad
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