On Thu, 6 Feb 2014, Devin Heitmueller wrote: > Hi there, > > So I have a problem in the field on kernel 3.7 which is looking more > and more like some sort of EHCI scheduler bug (very occasional > usb_submit_urb failures in snd-usb-audio wedge the entire USB stack > until reboot). Because it's only happening in the field and I cannot > repro locally (and it's happening on lots of machines), I was > speculating on how hard it would be to just backport in the entire > drivers/usb tree from the latest kernel back to 3.7. Is it possible to get any debugging information from the machines in the field? > I know this is an atypical thing to consider since most devs work on > the trunk, but can anybody give me a feel for how much breakage is > likely to occur If I move the tree between those two revs? Have there > been a ton of changes to common frameworks in the kernel that > drivers/usb relies on? > > Suggestions welcome. That's a pretty hard question to answer. Probably the best way to find out is try it and see what breaks. It may be easier to back-port just the EHCI driver family and not the whole stack. I can point out that in the last one or two kernel releases there were significant changes to the snd-usb-audio driver that affect the way it interacts with ehci-hcd. Just to make your life more difficult... 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
