musb_gadget: fix kernel oops in txstate()

Commit Message

Sergei Shtylyov Dec. 16, 2009, 5:38 p.m. UTC

None

Patch

Index: linux-2.6/drivers/usb/musb/musb_gadget.c
===================================================================
--- linux-2.6.orig/drivers/usb/musb/musb_gadget.c
+++ linux-2.6/drivers/usb/musb/musb_gadget.c
@@ -515,12 +515,12 @@  void musb_g_tx(struct musb *musb, u8 epn
 			if (csr & MUSB_TXCSR_FIFONOTEMPTY)
 				return;
 
-			if (!musb_ep->desc) {
+			request = musb_ep->desc ? next_request(musb_ep) : NULL;
+			if (!request) {
 				DBG(4, "%s idle now\n",
 					musb_ep->end_point.name);
 				return;
-			} else
-				request = next_request(musb_ep);
+			}
 		}
 
 		txstate(musb, to_musb_request(request));