As per the patch ("mailbox: Deprecate NULL mbox messages; Introduce
mbox_ring_doorbell()"), we want to switch all users of NULL mailbox
messages to use mbox_ring_doorbell().

This client only ever sent NULL messages, so the transition is
straightforward. We can remove the call to mbox_client_txdone(). The
call didn't do anything for NULL messages and it's now officially
documented not to be called for doorbells.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

(no changes since v1)

 drivers/soc/qcom/smp2p.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
index cb515c2340c1..139307b66a47 100644
--- a/drivers/soc/qcom/smp2p.c
+++ b/drivers/soc/qcom/smp2p.c
@@ -169,12 +169,10 @@ static void qcom_smp2p_kick(struct qcom_smp2p *smp2p)
 	/* Make sure any updated data is written before the kick */
 	wmb();
 
-	if (smp2p->mbox_chan) {
-		mbox_send_message(smp2p->mbox_chan, NULL);
-		mbox_client_txdone(smp2p->mbox_chan, 0);
-	} else {
+	if (smp2p->mbox_chan)
+		mbox_ring_doorbell(smp2p->mbox_chan);
+	else
 		regmap_write(smp2p->ipc_regmap, smp2p->ipc_offset, BIT(smp2p->ipc_bit));
-	}
 }
 
 static bool qcom_smp2p_check_ssr(struct qcom_smp2p *smp2p)
-- 
2.53.0.rc2.204.g2597b5adb4-goog