[PATCH v4 05/10] ASoC: renesas: fsi: Fix register access from in-flight IRQ after shutdown

[phucduc.bui@gmail.com]

From: bui duc phuc <phucduc.bui@gmail.com>

In-flight IRQs may still be running when the SPU clock is disabled,
leading to register access after shutdown and causing system hangs.

Fix this to use fsi_stream_is_working() when handling in-flight IRQ
handlers. If no streams are active, the handler now returns immediately
to prevent hardware access.

Suggested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---

Changes in v4:
 - use fsi_stream_is_working instead of running_streams.

 sound/soc/renesas/fsi.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound/soc/renesas/fsi.c b/sound/soc/renesas/fsi.c
index 429c3c9b6ede..0f350bddeb1d 100644
--- a/sound/soc/renesas/fsi.c
+++ b/sound/soc/renesas/fsi.c
@@ -470,6 +470,10 @@ static int fsi_get_current_fifo_samples(struct fsi_priv *fsi,
 
 static void fsi_count_fifo_err(struct fsi_priv *fsi)
 {
+	if (!fsi_stream_is_working(fsi, &fsi->playback) &&
+	    !fsi_stream_is_working(fsi, &fsi->capture))
+		return;
+
 	u32 ostatus = fsi_reg_read(fsi, DOFF_ST);
 	u32 istatus = fsi_reg_read(fsi, DIFF_ST);
 
@@ -681,6 +685,10 @@ static void fsi_irq_clear_status(struct fsi_priv *fsi)
 	u32 data = 0;
 	struct fsi_master *master = fsi_get_master(fsi);
 
+	if (!fsi_stream_is_working(fsi, &fsi->playback) &&
+	    !fsi_stream_is_working(fsi, &fsi->capture))
+		return;
+
 	data |= AB_IO(1, fsi_get_port_shift(fsi, &fsi->playback));
 	data |= AB_IO(1, fsi_get_port_shift(fsi, &fsi->capture));
 
-- 
2.43.0