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From:   Tong Zhang <ztong0001@gmail.com>
To:     Jonathan Cameron <jic23@kernel.org>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Sean Nyekjaer <sean@geanix.com>,
        Alexandru Ardelean <ardeleanalex@gmail.com>,
        Tong Zhang <ztong0001@gmail.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Jonathan Albrieux <jonathan.albrieux@gmail.com>,
        linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] iio:imu:bmi160: disable regulator in error path
Date:   Sat, 19 Mar 2022 12:34:59 -0700
Message-Id: <20220319193459.2628876-1-ztong0001@gmail.com>
In-Reply-To: <20220319162006.13c60c1f@jic23-huawei>
References: <20220319162006.13c60c1f@jic23-huawei>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Regulator should be disabled in error path as mentioned in _regulator_put().
Also disable accel if gyro cannot be enabled.

[   16.233604] WARNING: CPU: 0 PID: 2177 at drivers/regulator/core.c:2257 _regulator_put
[   16.240453] Call Trace:
[   16.240572]  <TASK>
[   16.240676]  regulator_put+0x26/0x40
[   16.240853]  regulator_bulk_free+0x26/0x50
[   16.241050]  release_nodes+0x3f/0x70
[   16.241225]  devres_release_group+0x147/0x1c0
[   16.241441]  ? bmi160_core_probe+0x175/0x3a0 [bmi160_core]

Fixes: 5dea3fb066f0 ("iio: imu: bmi160: added regulator support")
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
---
v2: also disable accel when gyro fail to enable

 drivers/iio/imu/bmi160/bmi160_core.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
index 824b5124a5f5..01336105792e 100644
--- a/drivers/iio/imu/bmi160/bmi160_core.c
+++ b/drivers/iio/imu/bmi160/bmi160_core.c
@@ -730,7 +730,7 @@ static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
 
 	ret = regmap_write(data->regmap, BMI160_REG_CMD, BMI160_CMD_SOFTRESET);
 	if (ret)
-		return ret;
+		goto disable_regulator;
 
 	usleep_range(BMI160_SOFTRESET_USLEEP, BMI160_SOFTRESET_USLEEP + 1);
 
@@ -741,29 +741,37 @@ static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
 	if (use_spi) {
 		ret = regmap_read(data->regmap, BMI160_REG_DUMMY, &val);
 		if (ret)
-			return ret;
+			goto disable_regulator;
 	}
 
 	ret = regmap_read(data->regmap, BMI160_REG_CHIP_ID, &val);
 	if (ret) {
 		dev_err(dev, "Error reading chip id\n");
-		return ret;
+		goto disable_regulator;
 	}
 	if (val != BMI160_CHIP_ID_VAL) {
 		dev_err(dev, "Wrong chip id, got %x expected %x\n",
 			val, BMI160_CHIP_ID_VAL);
-		return -ENODEV;
+		ret = -ENODEV;
+		goto disable_regulator;
 	}
 
 	ret = bmi160_set_mode(data, BMI160_ACCEL, true);
 	if (ret)
-		return ret;
+		goto disable_regulator;
 
 	ret = bmi160_set_mode(data, BMI160_GYRO, true);
 	if (ret)
-		return ret;
+		goto disable_accel;
 
 	return 0;
+
+disable_accel:
+	bmi160_set_mode(data, BMI160_ACCEL, false);
+
+disable_regulator:
+	regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies);
+	return ret;
 }
 
 static int bmi160_data_rdy_trigger_set_state(struct iio_trigger *trig,
-- 
2.25.1