On Tue, 2016-12-27 at 10:20 -0500, Alan Stern wrote: > On Tue, 27 Dec 2016, Oliver Neukum wrote: > > > On Thu, 2016-12-22 at 17:44 -0500, Alan Stern wrote: > > > I don't see how this patch fixes anything. Unless I'm mistaken, it > > > just avoids the problem by preventing the system from issuing the > > > command that provokes the error, rather than really fixing the > > > underlying error. > > > > Please clarify. If a reset leads to a disconnect, isn't that > > exactly what we want? > > I didn't express myself clearly enough. Yes, if a reset leads to a > disconnect then avoiding the reset will avoid problems. Good. Then we need to clarify whether the device was physically disconnected when the logs were taken. > But the _real_ error here is that xhci-hcd says "ERROR Transfer event > for disabled endpoint or incorrect stream ring" when the disconnect > occurs during reset. That shouldn't happen, no matter what quirks the > device has. It indicates a bug either in uas or in xhci-hcd. True. I am afraid that there necessarily is a window for resetting a disconnected device. But the check you proposed is better. however, I'd like to encapsulate that together with a test for logical disconnect. Uas is unlikely to be the only driver that has this issue. Regards Oliver -- 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
