On Wed, 20 Aug 2008, Meelis Roos wrote: > Tried 2.6.27-rc3 + yesterdays git that works on my Ultra5, still hangs > in USB startup on V100. > > Then I tried the suggestion to instrument ohci_hub_status_data() with > printks around spin_lock_irqsave() and return. Tried this with git HEAD > and this time ohci_hub_status_data seemed to be not reached at all, so > it hangs in USB code in slightly different place than in the original > trace. > > By the way, David - Sysrq-T and Sysrq-P do not seem to work in latest > git form me for some reason, from serial console. So no new trace. > > Will check the kernel debugging options with working U5 config to look > for any suspicios diffences there. > > What should I do next - probably go back to the original revision and > instrument ohci_hub_status_data() there? You should stick with a single well-defined kernel version, like 2.6.27-rc3. Start by seeing what happens with ohci_hub_status_data and move on from there. You might also want to instrument usb_hcd_poll_rh_status() in drivers/usb/core/hcd.c; that routine should call ohci_hub_status_data() and it should be called by usb_add_hcd(). Alan Stern -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
