linux-kernel - [PATCH 4.13 050/160] usb: gadget: core: fix ->udc_set

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Date:   Tue, 10 Oct 2017 21:49:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Roger Quadros <rogerq@...com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>
Subject: [PATCH 4.13 050/160] usb: gadget: core: fix ->udc_set_speed() logic

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

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

From: Roger Quadros <rogerq@...com>

commit 97e133d54c1ca8948b191e5721a145a76c4db33d upstream.

Consider the following case: udc controller supports SuperSpeed.  If we
first load a HighSpeed gadget followed by a SuperSpeed gadget, the
SuperSpeed gadget will be limited to HighSpeed as UDC core driver
doesn't call ->udc_set_speed() in the second case.

Call ->udc_set_speed() unconditionally to fix this issue.

This will also fix the case for dwc3 controller driver when SuperSpeed
gadget is loaded first and works in HighSpeed only as udc_set_speed()
was never being called.

Fixes: 6099eca796ae ("usb: gadget: core: introduce ->udc_set_speed() method")
Signed-off-by: Roger Quadros <rogerq@...com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/udc/core.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -1314,8 +1314,7 @@ static int udc_bind_to_driver(struct usb
 	udc->dev.driver = &driver->driver;
 	udc->gadget->dev.driver = &driver->driver;

-	if (driver->max_speed < udc->gadget->max_speed)
-		usb_gadget_udc_set_speed(udc, driver->max_speed);
+	usb_gadget_udc_set_speed(udc, driver->max_speed);

 	ret = driver->bind(udc->gadget, driver);
 	if (ret)