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Subject[PATCH v2 16/16] dmaengine: bcm-sba-raid: Explicitly ACK mailbox message after sending
Date
We should explicitly ACK mailbox message because after
sending message we can know the send status via error
attribute of brcm_message.

This will also help SBA-RAID to use "txdone_ack" method
whenever mailbox controller supports it.

Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
---
drivers/dma/bcm-sba-raid.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/bcm-sba-raid.c b/drivers/dma/bcm-sba-raid.c
index f9d110c..730e1a0 100644
--- a/drivers/dma/bcm-sba-raid.c
+++ b/drivers/dma/bcm-sba-raid.c
@@ -396,13 +396,17 @@ static int sba_send_mbox_request(struct sba_device *sba,
dev_err(sba->dev, "send message failed with error %d", ret);
return ret;
}
+
+ /* Check error returned by mailbox controller */
ret = req->msg.error;
if (ret < 0) {
dev_err(sba->dev, "message error %d", ret);
- return ret;
}

- return 0;
+ /* Signal txdone for mailbox channel */
+ mbox_client_txdone(sba->mchans[mchans_idx], ret);
+
+ return ret;
}

/* Note: Must be called with sba->reqs_lock held */
@@ -1724,7 +1728,7 @@ static int sba_probe(struct platform_device *pdev)
sba->client.dev = &pdev->dev;
sba->client.rx_callback = sba_receive_message;
sba->client.tx_block = false;
- sba->client.knows_txdone = false;
+ sba->client.knows_txdone = true;
sba->client.tx_tout = 0;

/* Allocate mailbox channel array */
--
2.7.4
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