On Thu, 25 Nov 2010, Alexander E. Patrakov wrote: > 25.11.2010 21:06, Alan Stern wrote: > > On Thu, 25 Nov 2010, Alexander E. Patrakov wrote: > > > >> Hello. > >> > >> After switching my Gentoo desktop from sysvinit + openrc to systemd, I > >> started getting "nobody cared" messages about IRQs 16 and 19 (common > >> thing: they are assigned to the USB controllers, that's why CC: > > According to your listing, they are used by uhci-hcd. Do the messages > > go away if you unload uhci-hcd before shutting down? > > It is not a module here, so I have to recompile the kernel in order to > try this. Will do that tomorrow. > > > You may need to debug the uhci-hcd driver. Look into > > drivers/usb/host/uhci-hcd.c; the uhci_shutdown() routine ought to be > > called and it ought to call uhci_hc_died(), which in turn calls > > uhci_reset_hc() in pci-quirks.c, which is supposed to prevent the > > controller from generating any IRQs. > > OK, tomorrow I will add some printks there. > > > Do you have any USB devices attached to bus 3 or bus 6? > > Yes: > > Bus 006 Device 002: ID 05d8:4002 Ultima Electronics Corp. Artec Ultima > 2000 (GT6801 based)/Lifetec LT9385/ScanMagic 1200 UB Plus Scanner > > Should I unplug it and retest the bug now? Sure. Even without rebuilding the kernel, you can unbind the uhci-hcd driver from the hardware by going to the /sys/bus/pci/drivers/uhci_hcd directory and doing: echo -n device-name >unbind where "device-name" is the name of one of the symlinks in that directory. Alan Stern -- 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
