On Thu, Jan 14, 2010 at 01:36:09PM -0800, Greg KH wrote: > Hi Sarah, > > Sorry to ask this in the middle of LCA, but Kurt ran across this and it > might be nice to get resolved soon before others hit it as well. > > As Kurt reports in the Novell bugzilla: > https://bugzilla.novell.com/show_bug.cgi?id=570362 > using the 2.6.32 kernel, he gets a pretty constant stream of the > warning: > xhci_hcd 0000:0f:00.0: WARN: short transfer on control ep > when plugging in a USB 2.0 device into a 3.0 controller. > > In looking at the code, it looks like this message is coming from the > hardware itself, is that correct? Yes, the message is simply stating something the hardware reported. > If so, this doesn't seem like anything that a user could do anything > about, and it doesn't seem to cause any problems, so could we lower it > to a "debug" message instead? Yes, it's not really a warning level message now. In the beginning of development, it was a warning level message because it meant the prototype devices were broken. :) Now it just means the device sent a short packet, which it's allowed to do. I'll try to create a patch, but I'm not sure I'll have time due to LCA. I also have a patch that also turns off some xHCI verbose debugging that leaks through when CONFIG_USB_DEBUG is turned on, but CONFIG_USB_HCD_XHCI_DEBUGGING is turned off. I'll see if I can dig that out of my tree. Sarah Sharp -- 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
