From: Gregory Herrero <[email protected]> If usb controller is in partial power down, any write to registers may cause unpredictable behavior. Thus, prevent any new request submission once controller is in partial power down.
Signed-off-by: Gregory Herrero <[email protected]> --- drivers/usb/dwc2/gadget.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index a360f49..732761f 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -790,6 +790,13 @@ static int s3c_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req, ep->name, req, req->length, req->buf, req->no_interrupt, req->zero, req->short_not_ok); + /* Prevent new request submission when controller is suspended */ + if (hs->lx_state == DWC2_L2) { + dev_dbg(hs->dev, "%s: don't submit request while suspended\n", + __func__); + return -EAGAIN; + } + /* initialise status of the request */ INIT_LIST_HEAD(&hs_req->queue); req->actual = 0; -- 2.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
