On Fri, 31 Jan 2014, Dan Williams wrote: > The port pm_runtime implementation unconditionally clears FEAT_C_ENABLE > after clearing PORT_POWER, but the bit is reserved on usb3 hub ports. > We expect khubd to be suspended at this time so we need to clear any > errors for usb2 ports.
I'm not sure what you meant in that last sentence. This is a _runtime_ suspend routine, not system suspend. Therefore khubd will most certainly be active. We need to clear the C_ENABLE feature (for non-SuperSpeed hubs) so that khubd won't see it and do away with the attached device. > --- a/drivers/usb/core/port.c > +++ b/drivers/usb/core/port.c > @@ -151,7 +151,8 @@ static int usb_port_runtime_suspend(struct device *dev) > set_bit(port1, hub->busy_bits); > retval = usb_hub_set_port_power(hdev, hub, port1, false); > usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); > - usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); > + if (!hub_is_superspeed(hdev)) > + usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); > clear_bit(port1, hub->busy_bits); > usb_autopm_put_interface(intf); Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
