On Fri, May 27, 2011 at 11:30:17AM +1000, Benjamin Herrenschmidt wrote: > 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. Nothing has changed in usbfs in a very long time, and the USB big merge went into Linus's tree a few days ago, so this is probably something else. bisection would be best to help you out here. thanks, greg k-h -- 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
