> Subject: [PATCH 1/1] usb: fsl_udc_core: dTD's next dtd pointer need to be > updated once written > > dTD's next dtd pointer need to be updated once CPU writes it, or this > request may not be handled by controller, then host will get NAK from > device forever. > > This problem occurs when there is a request is handling, we need to add > a new request to dTD list, if this new request is added before the > current > one is finished, the new request is intended to added as next dtd pointer > at current dTD, but without wmb(), the dTD's next dtd pointer may not be > updated when the controller reads it. In that case, the controller will > still get Terminate Bit is 1 at dTD's next dtd pointer, that means there > is > no next request, then this new request is missed by controller. > > CC: <stable@xxxxxxxxxxxxxxx> > Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx> Acked-by: Li Yang <leoli@xxxxxxxxxxxxx> -- 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
