Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Roger Quadros <rogerq@ti.com>,
        Felipe Balbi <felipe.balbi@linux.intel.com>
Subject: [PATCH 4.16 042/196] usb: dwc3: prevent setting PRTCAP to OTG from debugfs
Date:   Sun, 22 Apr 2018 15:51:02 +0200
Message-Id: <20180422135106.250936337@linuxfoundation.org>
In-Reply-To: <20180422135104.278511750@linuxfoundation.org>
References: <20180422135104.278511750@linuxfoundation.org>
User-Agent: quilt/0.65
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Roger Quadros <rogerq@ti.com>

commit daaecc6541d014dca073473ec8a4120c0babbeb4 upstream.

We don't support PRTCAP == OTG yet, so prevent user from
setting it via debugfs.

Fixes: 41ce1456e1db ("usb: dwc3: core: make dwc3_set_mode() work properly")
Cc: <stable@vger.kernel.org> # v4.12+
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/dwc3/core.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -119,6 +119,9 @@ static void __dwc3_set_mode(struct work_
 	if (dwc->dr_mode != USB_DR_MODE_OTG)
 		return;
 
+	if (dwc->desired_dr_role == DWC3_GCTL_PRTCAP_OTG)
+		return;
+
 	switch (dwc->current_dr_role) {
 	case DWC3_GCTL_PRTCAP_HOST:
 		dwc3_host_exit(dwc);