Use kzalloc() rather than kmalloc() for initializing the iio_channel structure.
This patch enables the iio_dev and iio_chan_spec are set to NULL.
This may prevent the page fault problem because the pointer of iio_chan_spec
is initialized as NULL.
The iio_chan_spec is updated only in case that the IIO map has
specific channel label.
When the map has no ADC channel label, then the value of iio_chan_spec
remains as invalid pointer.
To prevent this problem, the pointer should be initialized as NULL.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
(a) For better readability, replace 0 with IIO_CHAN_INFO_RAW.
(b) Make same line-format as other apis()
: iio_read_channel_scale() and iio_read_channel_offset()
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
We should be holding the mutex when we goto error_free_chans.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
These were originally introduced when the plan was to have parallel
IIO cores in and out of staging with a slow move between them.
Now we have reached the point where the whole core has moved,
they need clearing up!
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Use iio_device_get and iio_device_put instead of open-coding it.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Take the core support + the kfifo buffer implentation out of
staging. Whilst we are far from done in improving this subsystem
it is now at a stage where the userspae interfaces (provided by
the core) can be considered stable.
Drivers will follow over a longer time scale.
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
