[PATCH v3 09/15] rpmsg: glink: smem: Use mbox_ring_doorbell() instead of NULL message

[Douglas Anderson]

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.

Acked-by: Bjorn Andersson <andersson@xxxxxxxxxx>
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
---
This driver is used on my sc7180-trogdor Chromebook. While I haven't
stress tested with it, I can confirm that the system boots normally to
UI and can suspend/resume with this patch in place.

(no changes since v1)

 drivers/rpmsg/qcom_glink_smem.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/rpmsg/qcom_glink_smem.c b/drivers/rpmsg/qcom_glink_smem.c
index 7a982c60a8dd..f2a6d94e72ea 100644
--- a/drivers/rpmsg/qcom_glink_smem.c
+++ b/drivers/rpmsg/qcom_glink_smem.c
@@ -197,8 +197,7 @@ static void glink_smem_tx_kick(struct qcom_glink_pipe *glink_pipe)
 	struct glink_smem_pipe *pipe = to_smem_pipe(glink_pipe);
 	struct qcom_glink_smem *smem = pipe->smem;
 
-	mbox_send_message(smem->mbox_chan, NULL);
-	mbox_client_txdone(smem->mbox_chan, 0);
+	mbox_ring_doorbell(smem->mbox_chan);
 }
 
 static irqreturn_t qcom_glink_smem_intr(int irq, void *data)
-- 
2.53.0.273.g2a3d683680-goog