[PATCH v2] usb: gadget: udc: skip pullup() if already connected

[Xu Yang]

The device controller may update vbus status via usb_udc_vbus_handler(),
which tries to connect the gadget even though gadget_bind_driver() has
already called usb_udc_connect_control_locked(). This causes pullup() to
be called twice. Avoid this by checking if gadget->connected is true.

This also set gadget->connected as false in usb_gadget_activate() if it
became connected while it was being deactivated. Otherwise,
usb_gadget_connect_locked will return early and pullup() won't be called.

Signed-off-by: Xu Yang <xu.yang_2@xxxxxxx>

---
Changes in v2:
 - reset gadget->connected as false before calling usb_gadget_connect_locked()
---
 drivers/usb/gadget/udc/core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index e8861eaad907..60340ff9edbf 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -712,6 +712,9 @@ static int usb_gadget_connect_locked(struct usb_gadget *gadget)
 		goto out;
 	}
 
+	if (gadget->connected)
+		goto out;
+
 	if (gadget->deactivated || !gadget->udc->allow_connect || !gadget->udc->started) {
 		/*
 		 * If the gadget isn't usable (because it is deactivated,
@@ -885,8 +888,10 @@ int usb_gadget_activate(struct usb_gadget *gadget)
 	 * If gadget has been connected before deactivation, or became connected
 	 * while it was being deactivated, we call usb_gadget_connect().
 	 */
-	if (gadget->connected)
+	if (gadget->connected) {
+		gadget->connected = false;
 		ret = usb_gadget_connect_locked(gadget);
+	}
 
 unlock:
 	mutex_unlock(&gadget->udc->connect_lock);
-- 
2.34.1