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iio: core: move @trig_readonly from struct iio_dev to struct iio_dev_opaque 

This is only set via the iio_trig_set_immutable() call and later used
by the IIO core so there is no benefit in drivers being able to access
it.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Link: https://lore.kernel.org/r/20210426174911.397061-5-jic23@kernel.org
This commit is contained in:
Jonathan Cameron 2021-04-26 18:49:06 +01:00
parent 6eaf9f6a27
commit 3028e0c2af
3 changed files with 9 additions and 5 deletions
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10
drivers/iio/industrialio-trigger.c
View File

@ -117,14 +117,17 @@ EXPORT_SYMBOL(iio_trigger_unregister);
int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig)
{
struct iio_dev_opaque *iio_dev_opaque;
if (!indio_dev || !trig)
return -EINVAL;
iio_dev_opaque = to_iio_dev_opaque(indio_dev);
mutex_lock(&indio_dev->mlock);
WARN_ON(indio_dev->trig_readonly);
WARN_ON(iio_dev_opaque->trig_readonly);
indio_dev->trig = iio_trigger_get(trig);
indio_dev->trig_readonly = true;
iio_dev_opaque->trig_readonly = true;
mutex_unlock(&indio_dev->mlock);
return 0;
@ -402,6 +405,7 @@ static ssize_t iio_trigger_write_current(struct device *dev,
size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
struct iio_trigger *oldtrig = indio_dev->trig;
struct iio_trigger *trig;
int ret;
@ -411,7 +415,7 @@ static ssize_t iio_trigger_write_current(struct device *dev,
mutex_unlock(&indio_dev->mlock);
return -EBUSY;
}
if (indio_dev->trig_readonly) {
if (iio_dev_opaque->trig_readonly) {
mutex_unlock(&indio_dev->mlock);
return -EPERM;
}

2
include/linux/iio/iio-opaque.h
View File

@ -8,6 +8,7 @@
* @indio_dev: public industrial I/O device information
* @id: used to identify device internally
* @driver_module: used to make it harder to undercut users
* @trig_readonly: mark the current trigger immutable
* @event_interface: event chrdevs associated with interrupt lines
* @attached_buffers: array of buffers statically attached by the driver
* @attached_buffers_cnt: number of buffers in the array of statically attached buffers
@ -30,6 +31,7 @@ struct iio_dev_opaque {
struct iio_dev indio_dev;
int id;
struct module *driver_module;
bool trig_readonly;
struct iio_event_interface *event_interface;
struct iio_buffer **attached_buffers;
unsigned int attached_buffers_cnt;

2
include/linux/iio/iio.h
View File

@ -503,7 +503,6 @@ struct iio_buffer_setup_ops {
* @scan_timestamp: [INTERN] set if any buffers have requested timestamp
* @scan_index_timestamp:[INTERN] cache of the index to the timestamp
* @trig: [INTERN] current device trigger (buffer modes)
* @trig_readonly: [INTERN] mark the current trigger immutable
* @pollfunc: [DRIVER] function run on trigger being received
* @pollfunc_event: [DRIVER] function run on events trigger being received
* @channels: [DRIVER] channel specification structure table
@ -535,7 +534,6 @@ struct iio_dev {
bool scan_timestamp;
unsigned scan_index_timestamp;
struct iio_trigger *trig;
bool trig_readonly;
struct iio_poll_func *pollfunc;
struct iio_poll_func *pollfunc_event;