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/firmware/tegra/bpmp-tegra186.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/firmware/tegra/bpmp-tegra186.c b/drivers/firmware/tegra/bpmp-tegra186.c
index 64863db7a715..c45ea66aabfb 100644
--- a/drivers/firmware/tegra/bpmp-tegra186.c
+++ b/drivers/firmware/tegra/bpmp-tegra186.c
@@ -84,12 +84,10 @@ static int tegra186_bpmp_ring_doorbell(struct tegra_bpmp *bpmp)
 	struct tegra186_bpmp *priv = bpmp->priv;
 	int err;
 
-	err = mbox_send_message(priv->mbox.channel, NULL);
+	err = mbox_ring_doorbell(priv->mbox.channel);
 	if (err < 0)
 		return err;
 
-	mbox_client_txdone(priv->mbox.channel, 0);
-
 	return 0;
 }
 
-- 
2.53.0.rc2.204.g2597b5adb4-goog