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[07/10] ASoC: cs42l42: Minor error paths fixups

Message ID 20210510131357.17170-8-ckeepax@opensource.cirrus.com
State Accepted
Commit 0a0eb567e1d43cb87e9740c8e417d6fcff061582
Headers show
Series Tidy up device ID reading on legacy Cirrus parts | expand

Commit Message

Charles Keepax May 10, 2021, 1:13 p.m. UTC 
Correct some unchecked re-allocations of ret whilst reading the device
ID and ensure the hardware state is returned to off on the error
paths.

Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---
 sound/soc/codecs/cs42l42.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)
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Patch

diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index bf982e145e945..594d771336719 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -36,6 +36,7 @@ 
 #include <dt-bindings/sound/cs42l42.h>
 
 #include "cs42l42.h"
+#include "cirrus_legacy.h"
 
 static const struct reg_default cs42l42_reg_defaults[] = {
 	{ CS42L42_FRZ_CTL,			0x00 },
@@ -1816,8 +1817,7 @@  static int cs42l42_i2c_probe(struct i2c_client *i2c_client,
 				       const struct i2c_device_id *id)
 {
 	struct cs42l42_private *cs42l42;
-	int ret, i;
-	unsigned int devid = 0;
+	int ret, i, devid;
 	unsigned int reg;
 
 	cs42l42 = devm_kzalloc(&i2c_client->dev, sizeof(struct cs42l42_private),
@@ -1880,14 +1880,12 @@  static int cs42l42_i2c_probe(struct i2c_client *i2c_client,
 			"Failed to request IRQ: %d\n", ret);
 
 	/* initialize codec */
-	ret = regmap_read(cs42l42->regmap, CS42L42_DEVID_AB, &reg);
-	devid = (reg & 0xFF) << 12;
-
-	ret = regmap_read(cs42l42->regmap, CS42L42_DEVID_CD, &reg);
-	devid |= (reg & 0xFF) << 4;
-
-	ret = regmap_read(cs42l42->regmap, CS42L42_DEVID_E, &reg);
-	devid |= (reg & 0xF0) >> 4;
+	devid = cirrus_read_device_id(cs42l42->regmap, CS42L42_DEVID_AB);
+	if (devid < 0) {
+		ret = devid;
+		dev_err(&i2c_client->dev, "Failed to read device ID: %d\n", ret);
+		goto err_disable;
+	}
 
 	if (devid != CS42L42_CHIP_ID) {
 		ret = -ENODEV;