From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Tong Zhang <ztong0001@gmail.com>
Cc: Jonathan Cameron <jic23@kernel.org>,
Lars-Peter Clausen <lars@metafoo.de>,
Linus Walleij <linus.walleij@linaro.org>,
Alexandru Ardelean <ardeleanalex@gmail.com>,
Jonathan Albrieux <jonathan.albrieux@gmail.com>,
linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] iio:imu:bmi160: disable regulator in error path
Date: Fri, 18 Mar 2022 16:11:55 +0200 [thread overview]
Message-ID: <YjSTK4yun3kiulB1@smile.fi.intel.com> (raw)
In-Reply-To: <20220318070900.2499370-1-ztong0001@gmail.com>
On Fri, Mar 18, 2022 at 12:09:00AM -0700, Tong Zhang wrote:
> regulator should be disabled in error path as mentioned in _regulator_put()
>
> [ 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]
Seems legit. Currently we call it only when something else is failed afterwards.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Fixes: 5dea3fb066f0 ("iio: imu: bmi160: added regulator support")
> Signed-off-by: Tong Zhang <ztong0001@gmail.com>
> ---
> drivers/iio/imu/bmi160/bmi160_core.c | 17 +++++++++++------
> 1 file changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
> index 824b5124a5f5..f12446edb5ce 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 +741,34 @@ 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_regulator;
>
> return 0;
> +
> +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
>
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2022-03-18 14:12 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-18 7:09 [PATCH] iio:imu:bmi160: disable regulator in error path Tong Zhang
2022-03-18 14:11 ` Andy Shevchenko [this message]
2022-03-19 16:20 ` Jonathan Cameron
2022-03-19 19:33 ` Tong Zhang
2022-03-19 19:34 ` [PATCH v2] " Tong Zhang
2022-03-21 8:27 ` Andy Shevchenko
2022-03-21 15:53 ` Tong Zhang
2022-03-21 16:22 ` Andy Shevchenko
2022-03-27 15:51 ` Jonathan Cameron
2022-03-27 15:40 ` [PATCH v3] " Tong Zhang
2022-03-27 15:53 ` Jonathan Cameron
2022-03-27 15:58 ` Tong Zhang
2022-03-27 16:02 ` Jonathan Cameron
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