RDMA/cxgb3: Annotate an RCU pointer

Annotate t3cdev.l2opt with __rcu since it is used as an RCU pointer.
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/net/ethernet/chelsio/cxgb3/t3cdev.h

@@ -60,7 +60,7 @@ struct t3cdev {
 	int (*ctl)(struct t3cdev *dev, unsigned int req, void *data);
 	void (*neigh_update)(struct t3cdev *dev, struct neighbour *neigh);
 	void *priv;		/* driver private data */
-	void *l2opt;		/* optional layer 2 data */
+	void __rcu *l2opt;	/* optional layer 2 data */
 	void *l3opt;		/* optional layer 3 data */
 	void *l4opt;		/* optional layer 4 data */
 	void *ulp;		/* ulp stuff */