iio: core: move iio_dev's buffer_list to the private iio device object

This change moves the 'buffer_list' away from the public IIO device object
into the private part.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/industrialio-buffer.c

@@ -19,6 +19,7 @@
 #include <linux/sched/signal.h>
 
 #include <linux/iio/iio.h>
+#include <linux/iio/iio-opaque.h>
 #include "iio_core.h"
 #include "iio_core_trigger.h"
 #include <linux/iio/sysfs.h>
@@ -599,8 +600,10 @@ static int iio_compute_scan_bytes(struct iio_dev *indio_dev,
 static void iio_buffer_activate(struct iio_dev *indio_dev,
 	struct iio_buffer *buffer)
 {
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
+
 	iio_buffer_get(buffer);
-	list_add(&buffer->buffer_list, &indio_dev->buffer_list);
+	list_add(&buffer->buffer_list, &iio_dev_opaque->buffer_list);
 }
 
 static void iio_buffer_deactivate(struct iio_buffer *buffer)
@@ -612,10 +615,11 @@ static void iio_buffer_deactivate(struct iio_buffer *buffer)
 
 static void iio_buffer_deactivate_all(struct iio_dev *indio_dev)
 {
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
 	struct iio_buffer *buffer, *_buffer;
 
 	list_for_each_entry_safe(buffer, _buffer,
-			&indio_dev->buffer_list, buffer_list)
+			&iio_dev_opaque->buffer_list, buffer_list)
 		iio_buffer_deactivate(buffer);
 }
 
@@ -688,6 +692,7 @@ static int iio_verify_update(struct iio_dev *indio_dev,
 	struct iio_buffer *insert_buffer, struct iio_buffer *remove_buffer,
 	struct iio_device_config *config)
 {
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
 	unsigned long *compound_mask;
 	const unsigned long *scan_mask;
 	bool strict_scanmask = false;
@@ -710,12 +715,12 @@ static int iio_verify_update(struct iio_dev *indio_dev,
 	 * to verify.
 	 */
 	if (remove_buffer && !insert_buffer &&
-		list_is_singular(&indio_dev->buffer_list))
+		list_is_singular(&iio_dev_opaque->buffer_list))
 			return 0;
 
 	modes = indio_dev->modes;
 
-	list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) {
+	list_for_each_entry(buffer, &iio_dev_opaque->buffer_list, buffer_list) {
 		if (buffer == remove_buffer)
 			continue;
 		modes &= buffer->access->modes;
@@ -736,7 +741,7 @@ static int iio_verify_update(struct iio_dev *indio_dev,
 		 * Keep things simple for now and only allow a single buffer to
 		 * be connected in hardware mode.
 		 */
-		if (insert_buffer && !list_empty(&indio_dev->buffer_list))
+		if (insert_buffer && !list_empty(&iio_dev_opaque->buffer_list))
 			return -EINVAL;
 		config->mode = INDIO_BUFFER_HARDWARE;
 		strict_scanmask = true;
@@ -756,7 +761,7 @@ static int iio_verify_update(struct iio_dev *indio_dev,
 
 	scan_timestamp = false;
 
-	list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) {
+	list_for_each_entry(buffer, &iio_dev_opaque->buffer_list, buffer_list) {
 		if (buffer == remove_buffer)
 			continue;
 		bitmap_or(compound_mask, compound_mask, buffer->scan_mask,
@@ -902,10 +907,11 @@ static int iio_buffer_update_demux(struct iio_dev *indio_dev,
 
 static int iio_update_demux(struct iio_dev *indio_dev)
 {
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
 	struct iio_buffer *buffer;
 	int ret;
 
-	list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) {
+	list_for_each_entry(buffer, &iio_dev_opaque->buffer_list, buffer_list) {
 		ret = iio_buffer_update_demux(indio_dev, buffer);
 		if (ret < 0)
 			goto error_clear_mux_table;
@@ -913,7 +919,7 @@ static int iio_update_demux(struct iio_dev *indio_dev)
 	return 0;
 
 error_clear_mux_table:
-	list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list)
+	list_for_each_entry(buffer, &iio_dev_opaque->buffer_list, buffer_list)
 		iio_buffer_demux_free(buffer);
 
 	return ret;
@@ -922,6 +928,7 @@ static int iio_update_demux(struct iio_dev *indio_dev)
 static int iio_enable_buffers(struct iio_dev *indio_dev,
 	struct iio_device_config *config)
 {
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
 	struct iio_buffer *buffer;
 	int ret;
 
@@ -958,7 +965,7 @@ static int iio_enable_buffers(struct iio_dev *indio_dev,
 		indio_dev->info->hwfifo_set_watermark(indio_dev,
 			config->watermark);
 
-	list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) {
+	list_for_each_entry(buffer, &iio_dev_opaque->buffer_list, buffer_list) {
 		ret = iio_buffer_enable(buffer, indio_dev);
 		if (ret)
 			goto err_disable_buffers;
@@ -983,7 +990,7 @@ static int iio_enable_buffers(struct iio_dev *indio_dev,
 	return 0;
 
 err_disable_buffers:
-	list_for_each_entry_continue_reverse(buffer, &indio_dev->buffer_list,
+	list_for_each_entry_continue_reverse(buffer, &iio_dev_opaque->buffer_list,
 					     buffer_list)
 		iio_buffer_disable(buffer, indio_dev);
 err_run_postdisable:
@@ -998,12 +1005,13 @@ static int iio_enable_buffers(struct iio_dev *indio_dev,
 
 static int iio_disable_buffers(struct iio_dev *indio_dev)
 {
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
 	struct iio_buffer *buffer;
 	int ret = 0;
 	int ret2;
 
 	/* Wind down existing buffers - iff there are any */
-	if (list_empty(&indio_dev->buffer_list))
+	if (list_empty(&iio_dev_opaque->buffer_list))
 		return 0;
 
 	if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
@@ -1024,7 +1032,7 @@ static int iio_disable_buffers(struct iio_dev *indio_dev)
 			ret = ret2;
 	}
 
-	list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) {
+	list_for_each_entry(buffer, &iio_dev_opaque->buffer_list, buffer_list) {
 		ret2 = iio_buffer_disable(buffer, indio_dev);
 		if (ret2 && !ret)
 			ret = ret2;
@@ -1047,6 +1055,7 @@ static int __iio_update_buffers(struct iio_dev *indio_dev,
 		       struct iio_buffer *insert_buffer,
 		       struct iio_buffer *remove_buffer)
 {
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
 	struct iio_device_config new_config;
 	int ret;
 
@@ -1071,7 +1080,7 @@ static int __iio_update_buffers(struct iio_dev *indio_dev,
 		iio_buffer_activate(indio_dev, insert_buffer);
 
 	/* If no buffers in list, we are done */
-	if (list_empty(&indio_dev->buffer_list))
+	if (list_empty(&iio_dev_opaque->buffer_list))
 		return 0;
 
 	ret = iio_enable_buffers(indio_dev, &new_config);
@@ -1420,10 +1429,11 @@ static int iio_push_to_buffer(struct iio_buffer *buffer, const void *data)
  */
 int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data)
 {
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
 	int ret;
 	struct iio_buffer *buf;
 
-	list_for_each_entry(buf, &indio_dev->buffer_list, buffer_list) {
+	list_for_each_entry(buf, &iio_dev_opaque->buffer_list, buffer_list) {
 		ret = iio_push_to_buffer(buf, data);
 		if (ret < 0)
 			return ret;

drivers/iio/industrialio-core.c

@@ -1559,7 +1559,7 @@ struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
 		return NULL;
 	}
 	dev_set_name(&dev->dev, "iio:device%d", dev->id);
-	INIT_LIST_HEAD(&dev->buffer_list);
+	INIT_LIST_HEAD(&iio_dev_opaque->buffer_list);
 
 	return dev;
 }

include/linux/iio/iio-opaque.h

@@ -6,6 +6,7 @@
 /**
  * struct iio_dev_opaque - industrial I/O device opaque information
  * @indio_dev:			public industrial I/O device information
+ * @buffer_list:		list of all buffers currently attached
  * @channel_attr_list:		keep track of automatically created channel
  *				attributes
  * @chan_attr_group:		group for all attrs in base directory
@@ -16,6 +17,7 @@
  */
 struct iio_dev_opaque {
 	struct iio_dev			indio_dev;
+	struct list_head		buffer_list;
 	struct list_head		channel_attr_list;
 	struct attribute_group		chan_attr_group;
 #if defined(CONFIG_DEBUG_FS)

include/linux/iio/iio.h

@@ -490,7 +490,6 @@ struct iio_buffer_setup_ops {
  *			and owner
  * @event_interface:	[INTERN] event chrdevs associated with interrupt lines
  * @buffer:		[DRIVER] any buffer present
- * @buffer_list:	[INTERN] list of all buffers currently attached
  * @scan_bytes:		[INTERN] num bytes captured to be fed to buffer demux
  * @mlock:		[INTERN] lock used to prevent simultaneous device state
  *			changes
@@ -531,7 +530,6 @@ struct iio_dev {
 	struct iio_event_interface	*event_interface;
 
 	struct iio_buffer		*buffer;
-	struct list_head		buffer_list;
 	int				scan_bytes;
 	struct mutex			mlock;