Hi Alan, On Tue, Jul 21, 2009 at 4:54 PM, Alan Stern<stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, 21 Jul 2009, Manuel Lauss wrote: > >> > The patch below will certainly remove the warning; the question is >> > whether ehci-hcd will continue to work correctly. Some testing would >> > be appreciated. In particular, try to set up the conditions that would >> > cause the warning, and afterward do "rmmod ehci-hcd". That should >> > cause any remaining errors to surface. >> >> This is what I get. Additionally, after re-inserting ehci-hcd I get no more >> responses from the ACM device, although it is correctly detected. Other >> devices (mouse, usb storage) continue to work. >> >> # rmmod ehci_hcd >> au1xxx-ehci au1xxx-ehci.0: remove, state 1 >> usb usb2: USB disconnect, address 1 >> usb 2-1: USB disconnect, address 2 >> usb 2-1.2: USB disconnect, address 3 >> au1xxx-ehci au1xxx-ehci.0: dma_pool_destroy ehci_qtd, 8714f000 busy >> au1xxx-ehci au1xxx-ehci.0: dma_pool_destroy ehci_qh, 871b9000 busy >> au1xxx-ehci au1xxx-ehci.0: USB bus 2 deregistered > > This clearly is not working right, but I can't tell exactly what's > wrong. Can you repeat the test, this time acquiring a usbmon trace > starting before the test and ending after the rmmod? You'll have to > use usbmon's 0u file, so try to minimize any other USB activity going > on at the same time. I can't reproduce it if I do a trace after ehci-hcd has been inserted; i.e. the busy dma-pool only happens if I don't capture any usbmon output after insertion and before removal of ehci-hcd. I uploaded a trace here [1], it starts with loading of ehci-hcd, then ~5 seconds pause, read some data from ACM device, again some pause then unload of ehci-hcd. > As for why the device doesn't work when you reload ehci-hcd, I have no > idea. That's a separate matter and we can deal with it later. Maybe > fixing the first problem will also fix the second. doing insmod ehci-hcd ; rmmod ehci-hcd; insmod ehci-hcd is enough to render the device silent; however rmmod cdc-acm ; modprobe cdc-acm is fine. Still, opening the device generates hcd interrupts. [1] http://mlau.at/usbmon-acm3 Thanks! Manuel Lauss -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
