usb: gadget: gr_udc: Use GFP_ATOMIC when allocating under held spinlock

As gr_ep_init must be called with dev->lock held, GFP_KERNEL must not be used.
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NAndreas Larsson <andreas@gaisler.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/gadget/gr_udc.c

@@ -1990,8 +1990,8 @@ static int gr_ep_init(struct gr_udc *dev, int num, int is_in, u32 maxplimit)
 	INIT_LIST_HEAD(&ep->queue);
 
 	if (num == 0) {
-		_req = gr_alloc_request(&ep->ep, GFP_KERNEL);
-		buf = devm_kzalloc(dev->dev, PAGE_SIZE, GFP_DMA | GFP_KERNEL);
+		_req = gr_alloc_request(&ep->ep, GFP_ATOMIC);
+		buf = devm_kzalloc(dev->dev, PAGE_SIZE, GFP_DMA | GFP_ATOMIC);
 		if (!_req || !buf) {
 			/* possible _req freed by gr_probe via gr_remove */
 			return -ENOMEM;