From: Baolin Wang Date: Sat, 14 Jan 2017 08:40:39 +0000 (+0800) Subject: usb: dwc3: ep0: Fix the possible missed request for handling delay STATUS phase X-Git-Tag: v4.11-rc1~119^2~42^2~51 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=538967983b883a6059292a9f4f096357302ce1e5;p=linux.git usb: dwc3: ep0: Fix the possible missed request for handling delay STATUS phase When handing the SETUP packet by composite_setup(), we will release the dwc->lock. If we get the 'USB_GADGET_DELAYED_STATUS' result from setup function, which means we need to delay handling the STATUS phase. But during the lock release period, maybe the request for handling delay STATUS phase has been queued into list before we set 'dwc->delayed_status' flag or entering 'EP0_STATUS_PHASE' phase, then we will miss the chance to handle the STATUS phase. Thus we should check if the request for delay STATUS phase has been enqueued when entering 'EP0_STATUS_PHASE' phase in dwc3_ep0_xfernotready(), if so, we should handle it. Signed-off-by: Baolin Wang Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index 9bb1f8526f3e..e689cede9b0e 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -1123,7 +1123,21 @@ static void dwc3_ep0_xfernotready(struct dwc3 *dwc, dwc->ep0state = EP0_STATUS_PHASE; if (dwc->delayed_status) { + struct dwc3_ep *dep = dwc->eps[0]; + WARN_ON_ONCE(event->endpoint_number != 1); + /* + * We should handle the delay STATUS phase here if the + * request for handling delay STATUS has been queued + * into the list. + */ + if (!list_empty(&dep->pending_list)) { + dwc->delayed_status = false; + usb_gadget_set_state(&dwc->gadget, + USB_STATE_CONFIGURED); + dwc3_ep0_do_control_status(dwc, event); + } + return; }