4.14-stable review patch. If anyone has any objections, please let me know.
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From: Akinobu Mita akinobu.mita@gmail.com
[ Upstream commit 7d6cd21d82bacab2d1786fe5e989e4815b75d9a3 ]
When the buffer is enabled for ina2xx driver, a dedicated kthread is invoked to capture mesurement data. When the buffer is disabled, the kthread is stopped.
However if the kthread gets register access errors, it immediately exits and when the malfunctional buffer is disabled, the stale task_struct pointer is accessed as there is no kthread to be stopped.
A similar issue in the usbip driver is prevented by kthread_get_run and kthread_stop_put helpers by increasing usage count of the task_struct. This change applies the same solution.
Cc: Stefan Brüns stefan.bruens@rwth-aachen.de Cc: Jonathan Cameron jic23@kernel.org Signed-off-by: Akinobu Mita akinobu.mita@gmail.com Fixes: c43a102e67db ("iio: ina2xx: add support for TI INA2xx Power Monitors") Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iio/adc/ina2xx-adc.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-)
--- a/drivers/iio/adc/ina2xx-adc.c +++ b/drivers/iio/adc/ina2xx-adc.c @@ -30,6 +30,7 @@ #include <linux/module.h> #include <linux/of_device.h> #include <linux/regmap.h> +#include <linux/sched/task.h> #include <linux/util_macros.h>
#include <linux/platform_data/ina2xx.h> @@ -701,6 +702,7 @@ static int ina2xx_buffer_enable(struct i { struct ina2xx_chip_info *chip = iio_priv(indio_dev); unsigned int sampling_us = SAMPLING_PERIOD(chip); + struct task_struct *task;
dev_dbg(&indio_dev->dev, "Enabling buffer w/ scan_mask %02x, freq = %d, avg =%u\n", (unsigned int)(*indio_dev->active_scan_mask), @@ -710,11 +712,17 @@ static int ina2xx_buffer_enable(struct i dev_dbg(&indio_dev->dev, "Async readout mode: %d\n", chip->allow_async_readout);
- chip->task = kthread_run(ina2xx_capture_thread, (void *)indio_dev, - "%s:%d-%uus", indio_dev->name, indio_dev->id, - sampling_us); + task = kthread_create(ina2xx_capture_thread, (void *)indio_dev, + "%s:%d-%uus", indio_dev->name, indio_dev->id, + sampling_us); + if (IS_ERR(task)) + return PTR_ERR(task); + + get_task_struct(task); + wake_up_process(task); + chip->task = task;
- return PTR_ERR_OR_ZERO(chip->task); + return 0; }
static int ina2xx_buffer_disable(struct iio_dev *indio_dev) @@ -723,6 +731,7 @@ static int ina2xx_buffer_disable(struct
if (chip->task) { kthread_stop(chip->task); + put_task_struct(chip->task); chip->task = NULL; }