linux-kernel - Re: [PATCH] iio:st_sensors: Fix oops when probing SPI devices

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Date:	Thu, 23 Apr 2015 11:04:36 +0800
From:	Denis Ciocca <denis.ciocca@...com>
To:	Alban Bedel <alban.bedel@...onic-design.de>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
CC:	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Lee Jones <lee.jones@...aro.org>,
	Robert Dolca <robert.dolca@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio:st_sensors: Fix oops when probing SPI devices

Hi Alban,

after several months I'm finally back. I already did this patch, but I 
had no time to submit. Thanks to your support it is ok for me!

We need to propagate also the patch to fix previous kernel versions...

Acked-by: Denis Ciocca <denis.ciocca@...com>


Denis


On 04/20/2015 07:57 PM, Alban Bedel wrote:
> In SPI mode the transfer buffer is locked with a mutex. However this
> mutex is only initilized after the probe, but some transfer needs to
> be done in the probe.
>
> To fix this bug we move the mutex initialization at the beginning of
> the device probe.
>
> Signed-off-by: Alban Bedel <alban.bedel@...onic-design.de>
> ---
>   drivers/iio/accel/st_accel_core.c               | 1 +
>   drivers/iio/common/st_sensors/st_sensors_core.c | 2 --
>   drivers/iio/gyro/st_gyro_core.c                 | 1 +
>   drivers/iio/magnetometer/st_magn_core.c         | 1 +
>   drivers/iio/pressure/st_pressure_core.c         | 1 +
>   5 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/accel/st_accel_core.c b/drivers/iio/accel/st_accel_core.c
> index 58d1d13..211b132 100644
> --- a/drivers/iio/accel/st_accel_core.c
> +++ b/drivers/iio/accel/st_accel_core.c
> @@ -546,6 +546,7 @@ int st_accel_common_probe(struct iio_dev *indio_dev)
>   
>   	indio_dev->modes = INDIO_DIRECT_MODE;
>   	indio_dev->info = &accel_info;
> +	mutex_init(&adata->tb.buf_lock);
>   
>   	st_sensors_power_enable(indio_dev);
>   
> diff --git a/drivers/iio/common/st_sensors/st_sensors_core.c b/drivers/iio/common/st_sensors/st_sensors_core.c
> index edd13d2..8dd0477 100644
> --- a/drivers/iio/common/st_sensors/st_sensors_core.c
> +++ b/drivers/iio/common/st_sensors/st_sensors_core.c
> @@ -304,8 +304,6 @@ int st_sensors_init_sensor(struct iio_dev *indio_dev,
>   	struct st_sensors_platform_data *of_pdata;
>   	int err = 0;
>   
> -	mutex_init(&sdata->tb.buf_lock);
> -
>   	/* If OF/DT pdata exists, it will take precedence of anything else */
>   	of_pdata = st_sensors_of_probe(indio_dev->dev.parent, pdata);
>   	if (of_pdata)
> diff --git a/drivers/iio/gyro/st_gyro_core.c b/drivers/iio/gyro/st_gyro_core.c
> index 21395f2..ffe9664 100644
> --- a/drivers/iio/gyro/st_gyro_core.c
> +++ b/drivers/iio/gyro/st_gyro_core.c
> @@ -400,6 +400,7 @@ int st_gyro_common_probe(struct iio_dev *indio_dev)
>   
>   	indio_dev->modes = INDIO_DIRECT_MODE;
>   	indio_dev->info = &gyro_info;
> +	mutex_init(&gdata->tb.buf_lock);
>   
>   	st_sensors_power_enable(indio_dev);
>   
> diff --git a/drivers/iio/magnetometer/st_magn_core.c b/drivers/iio/magnetometer/st_magn_core.c
> index 8ade473..2e56f81 100644
> --- a/drivers/iio/magnetometer/st_magn_core.c
> +++ b/drivers/iio/magnetometer/st_magn_core.c
> @@ -369,6 +369,7 @@ int st_magn_common_probe(struct iio_dev *indio_dev)
>   
>   	indio_dev->modes = INDIO_DIRECT_MODE;
>   	indio_dev->info = &magn_info;
> +	mutex_init(&mdata->tb.buf_lock);
>   
>   	st_sensors_power_enable(indio_dev);
>   
> diff --git a/drivers/iio/pressure/st_pressure_core.c b/drivers/iio/pressure/st_pressure_core.c
> index 97baf40d..e881fa6 100644
> --- a/drivers/iio/pressure/st_pressure_core.c
> +++ b/drivers/iio/pressure/st_pressure_core.c
> @@ -417,6 +417,7 @@ int st_press_common_probe(struct iio_dev *indio_dev)
>   
>   	indio_dev->modes = INDIO_DIRECT_MODE;
>   	indio_dev->info = &press_info;
> +	mutex_init(&press_data->tb.buf_lock);
>   
>   	st_sensors_power_enable(indio_dev);
>   

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