linux-kernel - [PATCH 5/7] dmaengine: mmp_tdma: Log an error if channel is in wrong state

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Message-Id: <20200419164912.670973-6-lkundrak@v3.sk>
Date:   Sun, 19 Apr 2020 18:49:10 +0200
From:   Lubomir Rintel <lkundrak@...sk>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Dan Williams <dan.j.williams@...el.com>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lubomir Rintel <lkundrak@...sk>
Subject: [PATCH 5/7] dmaengine: mmp_tdma: Log an error if channel is in wrong state

Let's log an error if the channel can't be prepared because it is in an
unexpected state.

Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
 drivers/dma/mmp_tdma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/mmp_tdma.c b/drivers/dma/mmp_tdma.c
index 0b1aa6eab1801..191640f26246d 100644
--- a/drivers/dma/mmp_tdma.c
+++ b/drivers/dma/mmp_tdma.c
@@ -436,8 +436,10 @@ static struct dma_async_tx_descriptor *mmp_tdma_prep_dma_cyclic(
 	int num_periods = buf_len / period_len;
 	int i = 0, buf = 0;
 
-	if (tdmac->status != DMA_COMPLETE)
+	if (tdmac->status != DMA_COMPLETE) {
+		dev_err(tdmac->dev, "controller busy");
 		return NULL;
+	}
 
 	if (period_len > TDMA_MAX_XFER_BYTES) {
 		dev_err(tdmac->dev,
-- 
2.26.0