On Fri, 2011-05-27 at 09:16 +0800, Greg KH wrote: > On Fri, May 27, 2011 at 09:53:31AM +1000, Benjamin Herrenschmidt wrote: > > Hi folks ! > > > > Current upstream, POWER7 machine running bare metal, there's no BIOS at > > all, so the whole handover failing thing is an oddity in the first place > > which I haven't tracked down yet, but it should cause that crash: > > > > ohci_hcd 0000:07:02.0: OHCI Host Controller > > ohci_hcd 0000:07:02.0: new USB bus registered, assigned bus number 4 > > ohci_hcd 0000:07:02.0: USB HC takeover failed! (BIOS/SMM bug) > > Right there, that's the issue. You need a BIOS, or at least a way to > not fail this takeover test. > > A new quirk for this PCI device perhaps to handle this properly? No no, that's not the issue :-) The handover fail is bogus indeed and the reason it happens is unrelated to the driver or even the BIOS, it's some platform issue I have where there's a "phantom" function that then disappears. HOWEVER, this isn't the problem I'm reporting :-) The problem is that when the handover fails, the kernel crashes in usbfs :-) _that_ shouldn't happen. See the backtrace :-) This was introduced in the last 24h as far as I can tell. Cheers, Ben. -- 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
