On Fri, 2 Aug 2013, Benjamin Tissoires wrote: > > Could you please elaborate? (and put an elaborate description to revert > > commit log perhaps?) > > Sure, so here is the revert commit log: > > -- > > Commit "HID: hid-logitech-dj, querying_devices was never set" activate > a flag which guarantees that we do not ask the receiver for too many > enumeration. When the flag is set, each following enumeration call is > discarded (the usb request is not forwarded to the receiver). The flag > is then released when the driver receive a pairing information event, > which normally follows the enumeration request. > However, the USB3 bug makes the driver think the enumeration request > has been forwarded to the receiver. However, it is actually not the > case because the USB stack returns -EPIPE. So, when a new unknown > device appears, the workaround consisting in asking for a new > enumeration is not working anymore: this new enumeration is discarded > because of the flag, which is never reset. > > A solution could be to trigger a timeout before releasing it, but for > now, let's just revert the patch. > > -- Thanks Benjamin. I'd like to have a bit more clarification about the USB3 bug, as this whole issue is not completely clear to me. To be more specific -- when exactly do we receive -EPIPE, why do we receive it and why do we not handle it properly? Thanks again, -- Jiri Kosina SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
