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Date: Fri, 7 Jan 2022 13:59:47 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Miaoqian Lin <linmq006@...il.com>
Cc: adi.reus@...il.com, ardeleanalex@...il.com, gwendal@...omium.org,
jic23@...nel.org, lars@...afoo.de, linus.walleij@...aro.org,
linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
stephan@...hold.net
Subject: Re: [PATCH v2] iio: Fix error handling for PM
On Thu, Jan 06, 2022 at 11:23:09AM +0000, Miaoqian Lin wrote:
> The pm_runtime_enable will increase power disable depth.
> If the probe fails, we should use pm_runtime_disable() to balance
> pm_runtime_enable(). In the PM Runtime docs:
> Drivers in ->remove() callback should undo the runtime PM changes done
> in ->probe(). Usually this means calling pm_runtime_disable(),
> pm_runtime_dont_use_autosuspend() etc.
> We should do this in error handling.
>
> Fix this problem for the following drivers: bmc150, bmg160, kmx61,
> kxcj-1013, mma9551, mma9553.
LGTM, FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Fixes: 7d0ead5c3f00 ("iio: Reconcile operation order between iio_register/unregister and pm functions")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
> Changes in v2:
> - fix the fixes tag
> - fix similar problems introduced by the same commit
> ---
> drivers/iio/accel/bmc150-accel-core.c | 5 ++++-
> drivers/iio/accel/kxcjk-1013.c | 5 ++++-
> drivers/iio/accel/mma9551.c | 5 ++++-
> drivers/iio/accel/mma9553.c | 5 ++++-
> drivers/iio/gyro/bmg160_core.c | 5 ++++-
> drivers/iio/imu/kmx61.c | 5 ++++-
> drivers/iio/magnetometer/bmc150_magn.c | 5 +++--
> 7 files changed, 27 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/iio/accel/bmc150-accel-core.c b/drivers/iio/accel/bmc150-accel-core.c
> index b0678c351e82..c3a2b4c0b3b2 100644
> --- a/drivers/iio/accel/bmc150-accel-core.c
> +++ b/drivers/iio/accel/bmc150-accel-core.c
> @@ -1783,11 +1783,14 @@ int bmc150_accel_core_probe(struct device *dev, struct regmap *regmap, int irq,
> ret = iio_device_register(indio_dev);
> if (ret < 0) {
> dev_err(dev, "Unable to register iio device\n");
> - goto err_trigger_unregister;
> + goto err_pm_cleanup;
> }
>
> return 0;
>
> +err_pm_cleanup:
> + pm_runtime_dont_use_autosuspend(dev);
> + pm_runtime_disable(dev);
> err_trigger_unregister:
> bmc150_accel_unregister_triggers(data, BMC150_ACCEL_TRIGGERS - 1);
> err_buffer_cleanup:
> diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c
> index 24c9387c2968..ba6c8ca488b1 100644
> --- a/drivers/iio/accel/kxcjk-1013.c
> +++ b/drivers/iio/accel/kxcjk-1013.c
> @@ -1589,11 +1589,14 @@ static int kxcjk1013_probe(struct i2c_client *client,
> ret = iio_device_register(indio_dev);
> if (ret < 0) {
> dev_err(&client->dev, "unable to register iio device\n");
> - goto err_buffer_cleanup;
> + goto err_pm_cleanup;
> }
>
> return 0;
>
> +err_pm_cleanup:
> + pm_runtime_dont_use_autosuspend(&client->dev);
> + pm_runtime_disable(&client->dev);
> err_buffer_cleanup:
> iio_triggered_buffer_cleanup(indio_dev);
> err_trigger_unregister:
> diff --git a/drivers/iio/accel/mma9551.c b/drivers/iio/accel/mma9551.c
> index 4c359fb05480..c53a3398b14c 100644
> --- a/drivers/iio/accel/mma9551.c
> +++ b/drivers/iio/accel/mma9551.c
> @@ -495,11 +495,14 @@ static int mma9551_probe(struct i2c_client *client,
> ret = iio_device_register(indio_dev);
> if (ret < 0) {
> dev_err(&client->dev, "unable to register iio device\n");
> - goto out_poweroff;
> + goto err_pm_cleanup;
> }
>
> return 0;
>
> +err_pm_cleanup:
> + pm_runtime_dont_use_autosuspend(&client->dev);
> + pm_runtime_disable(&client->dev);
> out_poweroff:
> mma9551_set_device_state(client, false);
>
> diff --git a/drivers/iio/accel/mma9553.c b/drivers/iio/accel/mma9553.c
> index ba3ecb3b57dc..1599b75724d4 100644
> --- a/drivers/iio/accel/mma9553.c
> +++ b/drivers/iio/accel/mma9553.c
> @@ -1134,12 +1134,15 @@ static int mma9553_probe(struct i2c_client *client,
> ret = iio_device_register(indio_dev);
> if (ret < 0) {
> dev_err(&client->dev, "unable to register iio device\n");
> - goto out_poweroff;
> + goto err_pm_cleanup;
> }
>
> dev_dbg(&indio_dev->dev, "Registered device %s\n", name);
> return 0;
>
> +err_pm_cleanup:
> + pm_runtime_dont_use_autosuspend(&client->dev);
> + pm_runtime_disable(&client->dev);
> out_poweroff:
> mma9551_set_device_state(client, false);
> return ret;
> diff --git a/drivers/iio/gyro/bmg160_core.c b/drivers/iio/gyro/bmg160_core.c
> index 17b939a367ad..81a6d09788bd 100644
> --- a/drivers/iio/gyro/bmg160_core.c
> +++ b/drivers/iio/gyro/bmg160_core.c
> @@ -1188,11 +1188,14 @@ int bmg160_core_probe(struct device *dev, struct regmap *regmap, int irq,
> ret = iio_device_register(indio_dev);
> if (ret < 0) {
> dev_err(dev, "unable to register iio device\n");
> - goto err_buffer_cleanup;
> + goto err_pm_cleanup;
> }
>
> return 0;
>
> +err_pm_cleanup:
> + pm_runtime_dont_use_autosuspend(dev);
> + pm_runtime_disable(dev);
> err_buffer_cleanup:
> iio_triggered_buffer_cleanup(indio_dev);
> err_trigger_unregister:
> diff --git a/drivers/iio/imu/kmx61.c b/drivers/iio/imu/kmx61.c
> index 1dabfd615dab..f89724481df9 100644
> --- a/drivers/iio/imu/kmx61.c
> +++ b/drivers/iio/imu/kmx61.c
> @@ -1385,7 +1385,7 @@ static int kmx61_probe(struct i2c_client *client,
> ret = iio_device_register(data->acc_indio_dev);
> if (ret < 0) {
> dev_err(&client->dev, "Failed to register acc iio device\n");
> - goto err_buffer_cleanup_mag;
> + goto err_pm_cleanup;
> }
>
> ret = iio_device_register(data->mag_indio_dev);
> @@ -1398,6 +1398,9 @@ static int kmx61_probe(struct i2c_client *client,
>
> err_iio_unregister_acc:
> iio_device_unregister(data->acc_indio_dev);
> +err_pm_cleanup:
> + pm_runtime_dont_use_autosuspend(&client->dev);
> + pm_runtime_disable(&client->dev);
> err_buffer_cleanup_mag:
> if (client->irq > 0)
> iio_triggered_buffer_cleanup(data->mag_indio_dev);
> diff --git a/drivers/iio/magnetometer/bmc150_magn.c b/drivers/iio/magnetometer/bmc150_magn.c
> index f96f53175349..3d4d21f979fa 100644
> --- a/drivers/iio/magnetometer/bmc150_magn.c
> +++ b/drivers/iio/magnetometer/bmc150_magn.c
> @@ -962,13 +962,14 @@ int bmc150_magn_probe(struct device *dev, struct regmap *regmap,
> ret = iio_device_register(indio_dev);
> if (ret < 0) {
> dev_err(dev, "unable to register iio device\n");
> - goto err_disable_runtime_pm;
> + goto err_pm_cleanup;
> }
>
> dev_dbg(dev, "Registered device %s\n", name);
> return 0;
>
> -err_disable_runtime_pm:
> +err_pm_cleanup:
> + pm_runtime_dont_use_autosuspend(dev);
> pm_runtime_disable(dev);
> err_buffer_cleanup:
> iio_triggered_buffer_cleanup(indio_dev);
> --
> 2.17.1
>
--
With Best Regards,
Andy Shevchenko
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