The driver was converted to the new start/stop interface in f3d8bf34c2
("usb: gadget: at91_udc: convert to new style start/stop interface").
I overlooked that the driver is overwritting the private data which is
used by the composite framework. The udc driver doesn't read it, it is
only writen here

Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
 drivers/usb/gadget/at91_udc.c |    2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index 1a4430f..5fd61e2 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -1634,7 +1634,6 @@ static int at91_start(struct usb_gadget *gadget,
        udc = container_of(gadget, struct at91_udc, gadget);
        udc->driver = driver;
        udc->gadget.dev.driver = &driver->driver;
-       dev_set_drvdata(&udc->gadget.dev, &driver->driver);
        udc->enabled = 1;
        udc->selfpowered = 1;
 
@@ -1655,7 +1654,6 @@ static int at91_stop(struct usb_gadget *gadget,
        spin_unlock_irqrestore(&udc->lock, flags);
 
        udc->gadget.dev.driver = NULL;
-       dev_set_drvdata(&udc->gadget.dev, NULL);
        udc->driver = NULL;
 
        DBG("unbound from %s\n", driver->driver.name);
-- 
1.7.10.4

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