linux-kernel - [PATCH v2 04/12] ASoC: codecs: tx-macro: fix active

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Date:   Tue,  6 Sep 2022 18:01:04 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     broonie@...nel.org
Cc:     lgirdwood@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, bgoswami@...cinc.com,
        perex@...ex.cz, tiwai@...e.com, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH v2 04/12] ASoC: codecs: tx-macro: fix active_decimator array

currently active_decimator[] is unsigned long however we store negative
values when there is no decimator setup -1.

This is first bug, and the second bug is that we do not check if the decimator
is valid before writing to register using decimator as offset in
CDC_TXn_TX_PATH_CTL()

Fix these both by making active_decimator as integer array and adding check
in tx_macro_digital_mute() before accessing CDC_TXn_TX_PATH_CTL() register.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 sound/soc/codecs/lpass-tx-macro.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/lpass-tx-macro.c b/sound/soc/codecs/lpass-tx-macro.c
index c19bb19b717b..5c03ef8d88b3 100644
--- a/sound/soc/codecs/lpass-tx-macro.c
+++ b/sound/soc/codecs/lpass-tx-macro.c
@@ -259,7 +259,7 @@ struct tx_macro {
 	struct tx_mute_work tx_mute_dwork[NUM_DECIMATORS];
 	unsigned long active_ch_mask[TX_MACRO_MAX_DAIS];
 	unsigned long active_ch_cnt[TX_MACRO_MAX_DAIS];
-	unsigned long active_decimator[TX_MACRO_MAX_DAIS];
+	int active_decimator[TX_MACRO_MAX_DAIS];
 	struct regmap *regmap;
 	struct clk *mclk;
 	struct clk *npl;
@@ -1117,6 +1117,10 @@ static int tx_macro_digital_mute(struct snd_soc_dai *dai, int mute, int stream)
 	struct tx_macro *tx = snd_soc_component_get_drvdata(component);
 	u16 decimator;
 
+	/* active decimator not set yet */
+	if (tx->active_decimator[dai->id] == -1)
+		return 0;
+
 	decimator = tx->active_decimator[dai->id];
 
 	if (mute)
-- 
2.21.0