From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alan Stern , Pratyush Anand , Felipe Balbi Subject: [PATCH 3.10 27/78] usb: dwc3: fix implementation of endpoint wedge Date: Wed, 18 Dec 2013 13:10:55 -0800 Message-Id: <20131218211112.678191225@linuxfoundation.org> In-Reply-To: <20131218211111.903835960@linuxfoundation.org> References: <20131218211111.903835960@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alan Stern commit a535d81c92615b8ffb99b7e1fd1fb01effaed1af upstream. The dwc3 UDC driver doesn't implement endpoint wedging correctly. When an endpoint is wedged, the gadget driver should be allowed to clear the wedge by calling usb_ep_clear_halt(). Only the host is prevented from resetting the endpoint. This patch fixes the implementation. Signed-off-by: Alan Stern Tested-by: Pratyush Anand Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc3/ep0.c | 2 ++ drivers/usb/dwc3/gadget.c | 5 +---- 2 files changed, 3 insertions(+), 4 deletions(-) --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -478,6 +478,8 @@ static int dwc3_ep0_handle_feature(struc dep = dwc3_wIndex_to_dep(dwc, wIndex); if (!dep) return -EINVAL; + if (set == 0 && (dep->flags & DWC3_EP_WEDGE)) + break; ret = __dwc3_gadget_ep_set_halt(dep, set); if (ret) return -EINVAL; --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1220,9 +1220,6 @@ int __dwc3_gadget_ep_set_halt(struct dwc else dep->flags |= DWC3_EP_STALL; } else { - if (dep->flags & DWC3_EP_WEDGE) - return 0; - ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, DWC3_DEPCMD_CLEARSTALL, ¶ms); if (ret) @@ -1230,7 +1227,7 @@ int __dwc3_gadget_ep_set_halt(struct dwc value ? "set" : "clear", dep->name); else - dep->flags &= ~DWC3_EP_STALL; + dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE); } return ret;