ASoC: cs35l34: Minor error paths fixups

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>
Link: https://lore.kernel.org/r/20210510131357.17170-5-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/cs35l34.c b/sound/soc/codecs/cs35l34.c
index 110ee2d063581c0879c9792565bf3d1c974c6ad7..6657cc5db3e8719760a1f39266c24574d13155dc 100644 (file)
--- a/sound/soc/codecs/cs35l34.c
+++ b/sound/soc/codecs/cs35l34.c
@@ -34,6 +34,7 @@
 #include <sound/cs35l34.h>
 
 #include "cs35l34.h"
+#include "cirrus_legacy.h"
 
 #define PDN_DONE_ATTEMPTS 10
 #define CS35L34_START_DELAY 50
@@ -996,9 +997,8 @@ static int cs35l34_i2c_probe(struct i2c_client *i2c_client,
        struct cs35l34_private *cs35l34;
        struct cs35l34_platform_data *pdata =
                dev_get_platdata(&i2c_client->dev);
-       int i;
+       int i, devid;
        int ret;
-       unsigned int devid = 0;
        unsigned int reg;
 
        cs35l34 = devm_kzalloc(&i2c_client->dev, sizeof(*cs35l34), GFP_KERNEL);
@@ -1039,13 +1039,15 @@ static int cs35l34_i2c_probe(struct i2c_client *i2c_client,
        } else {
                pdata = devm_kzalloc(&i2c_client->dev, sizeof(*pdata),
                                     GFP_KERNEL);
-               if (!pdata)
-                       return -ENOMEM;
+               if (!pdata) {
+                       ret = -ENOMEM;
+                       goto err_regulator;
+               }
 
                if (i2c_client->dev.of_node) {
                        ret = cs35l34_handle_of_data(i2c_client, pdata);
                        if (ret != 0)
-                               return ret;
+                               goto err_regulator;
 
                }
                cs35l34->pdata = *pdata;
@@ -1059,33 +1061,34 @@ static int cs35l34_i2c_probe(struct i2c_client *i2c_client,
 
        cs35l34->reset_gpio = devm_gpiod_get_optional(&i2c_client->dev,
                                "reset-gpios", GPIOD_OUT_LOW);
-       if (IS_ERR(cs35l34->reset_gpio))
-               return PTR_ERR(cs35l34->reset_gpio);
+       if (IS_ERR(cs35l34->reset_gpio)) {
+               ret = PTR_ERR(cs35l34->reset_gpio);
+               goto err_regulator;
+       }
 
        gpiod_set_value_cansleep(cs35l34->reset_gpio, 1);
 
        msleep(CS35L34_START_DELAY);
 
-       ret = regmap_read(cs35l34->regmap, CS35L34_DEVID_AB, &reg);
-
-       devid = (reg & 0xFF) << 12;
-       ret = regmap_read(cs35l34->regmap, CS35L34_DEVID_CD, &reg);
-       devid |= (reg & 0xFF) << 4;
-       ret = regmap_read(cs35l34->regmap, CS35L34_DEVID_E, &reg);
-       devid |= (reg & 0xF0) >> 4;
+       devid = cirrus_read_device_id(cs35l34->regmap, CS35L34_DEVID_AB);
+       if (devid < 0) {
+               ret = devid;
+               dev_err(&i2c_client->dev, "Failed to read device ID: %d\n", ret);
+               goto err_reset;
+       }
 
        if (devid != CS35L34_CHIP_ID) {
                dev_err(&i2c_client->dev,
                        "CS35l34 Device ID (%X). Expected ID %X\n",
                        devid, CS35L34_CHIP_ID);
                ret = -ENODEV;
-               goto err_regulator;
+               goto err_reset;
        }
 
        ret = regmap_read(cs35l34->regmap, CS35L34_REV_ID, &reg);
        if (ret < 0) {
                dev_err(&i2c_client->dev, "Get Revision ID failed\n");
-               goto err_regulator;
+               goto err_reset;
        }
 
        dev_info(&i2c_client->dev,
@@ -1110,11 +1113,13 @@ static int cs35l34_i2c_probe(struct i2c_client *i2c_client,
        if (ret < 0) {
                dev_err(&i2c_client->dev,
                        "%s: Register component failed\n", __func__);
-               goto err_regulator;
+               goto err_reset;
        }
 
        return 0;
 
+err_reset:
+       gpiod_set_value_cansleep(cs35l34->reset_gpio, 0);
 err_regulator:
        regulator_bulk_disable(cs35l34->num_core_supplies,
                cs35l34->core_supplies);