USB: gadget: core: adjust uevent timing on gadget unbind

commit 73ea73affe8622bdf292de898da869d441da6a9d upstream.

The KOBJ_CHANGE uevent is sent before gadget unbind is actually
executed, resulting in inaccurate uevent emitted at incorrect timing
(the uevent would have USB_UDC_DRIVER variable set while it would
soon be removed).
Move the KOBJ_CHANGE uevent to the end of the unbind function so that
uevent is sent only after the change has been made.

Fixes: 2ccea03a8f7e ("usb: gadget: introduce UDC Class")
Cc: stable@vger.kernel.org
Signed-off-by: Roy Luo <royluo@google.com>
Link: https://lore.kernel.org/r/20231128221756.2591158-1-royluo@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 1c0c61e..c40f2ec 100644 (file)
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -1608,8 +1608,6 @@ static void gadget_unbind_driver(struct device *dev)
 
        dev_dbg(&udc->dev, "unbinding gadget driver [%s]\n", driver->function);
 
-       kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
-
        udc->allow_connect = false;
        cancel_work_sync(&udc->vbus_work);
        mutex_lock(&udc->connect_lock);
@@ -1629,6 +1627,8 @@ static void gadget_unbind_driver(struct device *dev)
        driver->is_bound = false;
        udc->driver = NULL;
        mutex_unlock(&udc_lock);
+
+       kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
 }
 
 /* ------------------------------------------------------------------------- */