diff --git a/arch/arm/plat-omap/include/plat/mailbox.h b/arch/arm/plat-omap/include/plat/mailbox.h
index 319306a8f44a..8260a3feeb6f 100644
--- a/arch/arm/plat-omap/include/plat/mailbox.h
+++ b/arch/arm/plat-omap/include/plat/mailbox.h
@@ -63,7 +63,7 @@ struct omap_mbox {
 	void			(*err_notify)(void);
 };
 
-int omap_mbox_msg_send(struct omap_mbox *, mbox_msg_t msg, void *);
+int omap_mbox_msg_send(struct omap_mbox *, mbox_msg_t msg);
 void omap_mbox_init_seq(struct omap_mbox *);
 
 struct omap_mbox *omap_mbox_get(const char *);
diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c
index b49bb291c678..99ecf8037ddf 100644
--- a/arch/arm/plat-omap/mailbox.c
+++ b/arch/arm/plat-omap/mailbox.c
@@ -88,7 +88,6 @@ static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
 
 struct omap_msg_tx_data {
 	mbox_msg_t	msg;
-	void		*arg;
 };
 
 static void omap_msg_tx_end_io(struct request *rq, int error)
@@ -97,7 +96,7 @@ static void omap_msg_tx_end_io(struct request *rq, int error)
 	__blk_put_request(rq->q, rq);
 }
 
-int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg, void* arg)
+int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
 {
 	struct omap_msg_tx_data *tx_data;
 	struct request *rq;
@@ -114,7 +113,6 @@ int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg, void* arg)
 	}
 
 	tx_data->msg = msg;
-	tx_data->arg = arg;
 	rq->end_io = omap_msg_tx_end_io;
 	blk_insert_request(q, rq, 0, tx_data);