[PATCH 1/2] spi: spacemit: fix dangling TX DMA descriptor on RX prep failure

[Pei Xiao]

In k1_spi_dma_one(), the TX DMA descriptor is submitted via
dmaengine_submit() before the RX descriptor is prepared.  If
k1_spi_dma_prep() fails for RX, the function jumps to the fallback
path without terminating the already-submitted TX descriptor.

So terminate the TX channel with dmaengine_terminate_sync() when RX
descriptor preparation fails.

Fixes: efcd8b9d1111 ("spi: spacemit: introduce SpacemiT K1 SPI controller driver")
Signed-off-by: Pei Xiao <xiaopei01 at kylinos.cn>
---
 drivers/spi/spi-spacemit-k1.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-spacemit-k1.c b/drivers/spi/spi-spacemit-k1.c
index 215fe66d27b4..cd2955949c5c 100644
--- a/drivers/spi/spi-spacemit-k1.c
+++ b/drivers/spi/spi-spacemit-k1.c
@@ -289,8 +289,10 @@ static int k1_spi_dma_one(struct spi_controller *host, struct spi_device *spi,
 
 	/* Prepare the RX descriptor and submit it */
 	desc = k1_spi_dma_prep(drv_data, transfer, false);
-	if (!desc)
+	if (!desc) {
+		dmaengine_terminate_sync(host->dma_tx);
 		goto fallback;
+	}
 
 	/* When RX is complete we also know TX has completed */
 	desc->callback = k1_spi_dma_callback;
-- 
2.25.1