linux-kernel - [PATCH 2/4] ASoC: codecs: wsa883x: Handle reading version failure

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Message-Id: <20240710-asoc-wsa88xx-version-v1-2-f1c54966ccde@linaro.org>
Date: Wed, 10 Jul 2024 15:52:31 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, 
 Banajit Goswami <bgoswami@...cinc.com>, Liam Girdwood <lgirdwood@...il.com>, 
 Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>, 
 Takashi Iwai <tiwai@...e.com>
Cc: alsa-devel@...a-project.org, linux-arm-msm@...r.kernel.org, 
 linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 2/4] ASoC: codecs: wsa883x: Handle reading version failure

If reading version and variant from registers fails (which is unlikely
but possible, because it is a read over bus), the driver will proceed
and perform device configuration based on uninitialized stack variables.
Handle it a bit better - bail out without doing any init and failing the
update status Soundwire callback.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 sound/soc/codecs/wsa883x.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/sound/soc/codecs/wsa883x.c b/sound/soc/codecs/wsa883x.c
index f5a15f0e891e..60b78560f4b7 100644
--- a/sound/soc/codecs/wsa883x.c
+++ b/sound/soc/codecs/wsa883x.c
@@ -997,15 +997,19 @@ static const struct reg_sequence reg_init[] = {
 	{WSA883X_GMAMP_SUP1, 0xE2},
 };
 
-static void wsa883x_init(struct wsa883x_priv *wsa883x)
+static int wsa883x_init(struct wsa883x_priv *wsa883x)
 {
 	struct regmap *regmap = wsa883x->regmap;
-	int variant, version;
+	int variant, version, ret;
 
-	regmap_read(regmap, WSA883X_OTP_REG_0, &variant);
+	ret = regmap_read(regmap, WSA883X_OTP_REG_0, &variant);
+	if (ret)
+		return ret;
 	wsa883x->variant = variant & WSA883X_ID_MASK;
 
-	regmap_read(regmap, WSA883X_CHIP_ID0, &version);
+	ret = regmap_read(regmap, WSA883X_CHIP_ID0, &version);
+	if (ret)
+		return ret;
 	wsa883x->version = version;
 
 	switch (wsa883x->variant) {
@@ -1040,6 +1044,8 @@ static void wsa883x_init(struct wsa883x_priv *wsa883x)
 				   WSA883X_DRE_OFFSET_MASK,
 				   wsa883x->comp_offset);
 	}
+
+	return 0;
 }
 
 static int wsa883x_update_status(struct sdw_slave *slave,
@@ -1048,7 +1054,7 @@ static int wsa883x_update_status(struct sdw_slave *slave,
 	struct wsa883x_priv *wsa883x = dev_get_drvdata(&slave->dev);
 
 	if (status == SDW_SLAVE_ATTACHED && slave->dev_num > 0)
-		wsa883x_init(wsa883x);
+		return wsa883x_init(wsa883x);
 
 	return 0;
 }

-- 
2.43.0