From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Moiz Sonasath , Felipe Balbi Subject: [ 27/42] usb: dwc3: gadget: fix endpoint always busy bug Date: Thu, 25 Oct 2012 17:05:35 -0700 Message-Id: <20121026000127.511147133@linuxfoundation.org> In-Reply-To: <20121026000124.790781113@linuxfoundation.org> References: <20121026000124.790781113@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Felipe Balbi commit 041d81f493d90c940ec41f0ec98bc7c4f2fba431 upstream. If a USB transfer has already been started, meaning we have already issued StartTransfer command to that particular endpoint, DWC3_EP_BUSY flag has also already been set. When we try to cancel this transfer which is already in controller's cache, we will not receive XferComplete event and we must clear DWC3_EP_BUSY in order to allow subsequent requests to be properly started. The best place to clear that flag is right after issuing DWC3_DEPCMD_ENDTRANSFER. Reported-by: Moiz Sonasath Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc3/gadget.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1777,6 +1777,7 @@ static void dwc3_stop_active_transfer(st ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, ¶ms); WARN_ON_ONCE(ret); dep->res_trans_idx = 0; + dep->flags &= ~DWC3_EP_BUSY; } }