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Subject[PATCH 4.14 039/164] usb: dwc3: prevent setting PRTCAP to OTG from debugfs
Date
4.14-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
@@ -128,6 +128,9 @@ 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);

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