I've done some further work on the problem I reported earlier involving
the Sharp Zaurus and the uhci and usbnet modules. I'm currently running
2.4.22-rc2 with ACPI (20030813) and swsusp (1.1-rc5) patches. I can
reproduce the problem with only uhci.o and usbcore.o loaded; the "->"
lines below indicate what I believe are the relevant console/syslog
messages:
modprobe uhci
plug in the zaurus
-> usb.c: USB device 2 (vend/prod 0x4dd/0x8004) is not claimed by any active driver.
unplug the zaurus
-> uhci.c: efe0: host controller halted. very bad
rmmod uhci
-> kmem_cache_destroy: Can't free all objects c158bcd0
-> uhci: not all urb_priv's were freed
modprobe uhci
-> uhci.c: USB Universal Host Controller Interface driver v1.1
-> kernel BUG at slab.c:815!
[stack dump, call trace]
The code in uhci.c, uhci_interrupt() says:
...
if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) {
...
if ((status & USBSTS_HCH) && !uhci->is_suspended) {
err("%x: host controller halted. very bad",io_addr);
/* FIXME: Reset the controller, fix the offending TD */
}
I tried reset_hc(uhci) here, but clearly that's not enough. I don't know
how to "fix the offending TD", probably if it were trivial it would
already be done. I guess there some urb pending which never gets cleared,
then it all falls down upon module removal?
hints, pointers, suggestions, code snippets, patch(es) would be much
appreciated. I need to be able to rmmod uhci to suspend/resume.
thanks,
rob.
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