[PATCH] USB: kill speedtouch tasklet when shutdown

  speedtouch: kill receive queue tasklet on shutdown (race pointed
out by Oliver Neukum).

drivers/usb/misc/speedtouch.c

@@ -775,6 +775,8 @@ static int udsl_usb_data_exit (struct udsl_instance_data *instance)
 		ctx->skb = NULL;
 	}
 
+	tasklet_kill (&instance->recvqueue_tasklet);
+
 	for (i = 0; i < UDSL_NUMBER_SND_URBS; i++) {
 		struct udsl_usb_send_data_context *ctx = &(instance->send_ctx[i]);