From: Gregory Herrero Date: Wed, 29 Apr 2015 20:09:08 +0000 (+0200) Subject: usb: dwc2: gadget: prevent new request submission during suspend X-Git-Tag: v4.2-rc1~86^2~16^2~77 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7ababa926c66c5c5a862489b475ff5d96a7dd03a;p=platform%2Fkernel%2Flinux-exynos.git usb: dwc2: gadget: prevent new request submission during suspend 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. Acked-by: John Youn Signed-off-by: Gregory Herrero Signed-off-by: Felipe Balbi --- 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;