[PATCH 05/21] ASoC: SOF: Intel: hda-sdw-bpt: Stop active DMA before closing BPT streams

[Lee Jones]

When sdw_enable_stream() fails in intel_ace2x_bpt_send_async() after
hda_sdw_bpt_send_async() has already started the TX and RX DMA streams,
intel_ace2x_bpt_close_stream() invokes hda_sdw_bpt_close() directly
without calling hda_sdw_bpt_wait().  As a result,
hda_sdw_bpt_dma_deprepare() tears down the DMA buffers and BDL while
the DMA hardware is still running.

Disable any running TX or RX BPT DMA stream at the start of
hda_sdw_bpt_close() before unmapping channels and depreparing DMA
resources.

Fixes: 4c1ce9f37d8a ("soundwire: intel_ace2x: add BPT send_async/wait callbacks")
Closes: https://sashiko.dev/#/bug/linux-ff0012de-abdd-4796-875e-b1fbbf47235f
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Lee Jones <lee@xxxxxxxxxx>
---
 sound/soc/sof/intel/hda-sdw-bpt.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/soc/sof/intel/hda-sdw-bpt.c b/sound/soc/sof/intel/hda-sdw-bpt.c
index ba9fbd662b85..9d97d8676251 100644
--- a/sound/soc/sof/intel/hda-sdw-bpt.c
+++ b/sound/soc/sof/intel/hda-sdw-bpt.c
@@ -456,6 +456,12 @@ int hda_sdw_bpt_close(struct device *dev, int link_id, struct hdac_ext_stream *b
 	int ret;
 	int ret1;
 
+	if (bpt_rx_stream && hdac_stream(bpt_rx_stream)->running)
+		hda_sdw_bpt_dma_disable(dev, bpt_rx_stream);
+
+	if (bpt_tx_stream && hdac_stream(bpt_tx_stream)->running)
+		hda_sdw_bpt_dma_disable(dev, bpt_tx_stream);
+
 	/*
 	 * In the case of SoundWire we need to reset the PCMSyCM registers.
 	 * Need to continue depreparing the DMA buffers even if this fails.
-- 
2.56.0.317.g454f8302e1-goog