linux-kernel - [PATCH] usb: gadget: core: fix ->udc_set

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Date:   Tue, 19 Sep 2017 11:46:16 +0300
From:   Roger Quadros <rogerq@...com>
To:     <balbi@...nel.org>
CC:     <vigneshr@...com>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Roger Quadros <rogerq@...com>,
        "[v4.13+]" <stable@...r.kernel.org>
Subject: [PATCH] usb: gadget: core: fix ->udc_set_speed() logic

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")
Cc: <stable@...r.kernel.org> [v4.13+]
Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/usb/gadget/udc/core.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 75c51ca..d41d07a 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -1320,8 +1320,7 @@ static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *dri
 	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)
-- 
2.7.4

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