On Mon, 15 Oct 2012, Sarah Sharp wrote: > I double checked, and calling usb_set_interface for the same alternate > setting that is currently installed will cause the xHCI driver to drop > and re-add the current endpoints. This should cause the toggle to be > reset for the endpoints. > > I suppose the xHCI driver could do the same thing internally: if > usb_reset_endpoint() is called with an endpoint that isn't halted, we > could issue a Configure Endpoint command to drop and re-add the > endpoint. But we would need to make sure the bandwidth mutex is held, > and I would have to look at whether it would be safe to add mutex > locking calls in usb_hcd_reset_endpoint(). Probably the best way for xhci-hcd to implement usb_reset_endpoint is to issue a Configure Endpoint command unconditionally. Yes, usb_hcd_reset_endpoint is always supposed to be called in process context, although this doesn't seem to be documented anywhere. 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
