On Sat, Feb 07, 2026 at 08:01:32PM -0800, Douglas Anderson wrote:
> 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.
>
> Also remove the comment about the only cause of errors for
> mbox_send_message() being if the framework's FIFO was full since we
> don't queue doorbells.
>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Bjorn Andersson <andersson@kernel.org>
Regards,
Bjorn
> ---
>
> (no changes since v1)
>
> drivers/rpmsg/qcom_smd.c | 13 +++----------
> 1 file changed, 3 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
> index 42594f5ee438..afe1177d092e 100644
> --- a/drivers/rpmsg/qcom_smd.c
> +++ b/drivers/rpmsg/qcom_smd.c
> @@ -371,17 +371,10 @@ static void qcom_smd_signal_channel(struct qcom_smd_channel *channel)
> {
> struct qcom_smd_edge *edge = channel->edge;
>
> - if (edge->mbox_chan) {
> - /*
> - * We can ignore a failing mbox_send_message() as the only
> - * possible cause is that the FIFO in the framework is full of
> - * other writes to the same bit.
> - */
> - mbox_send_message(edge->mbox_chan, NULL);
> - mbox_client_txdone(edge->mbox_chan, 0);
> - } else {
> + if (edge->mbox_chan)
> + mbox_ring_doorbell(edge->mbox_chan);
> + else
> regmap_write(edge->ipc_regmap, edge->ipc_offset, BIT(edge->ipc_bit));
> - }
> }
>
> /*
> --
> 2.53.0.rc2.204.g2597b5adb4-goog
>