[PATCH v2 5/5] iio:buffer: Ignore noop requests for iio_update_buffers()

[Lars-Peter Clausen <lars@metafoo.de>]

Since the kernel now disables all buffers when a device is unregistered it might
happen that a in-kernel consumer tries to disable that buffer again. So ignore
requests where the buffer already is in the desired state.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
---
No changes since v1
---
 drivers/iio/industrialio-buffer.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index d6a5455..fd3f3af 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -681,9 +681,23 @@ int iio_update_buffers(struct iio_dev *indio_dev,
 {
 	int ret;
 
+	if (insert_buffer == remove_buffer)
+		return 0;
+
 	mutex_lock(&indio_dev->info_exist_lock);
 	mutex_lock(&indio_dev->mlock);
 
+	if (insert_buffer && iio_buffer_is_active(insert_buffer))
+		insert_buffer = NULL;
+
+	if (remove_buffer && !iio_buffer_is_active(remove_buffer))
+		remove_buffer = NULL;
+
+	if (!insert_buffer && !remove_buffer) {
+		ret = 0;
+		goto out_unlock;
+	}
+
 	if (indio_dev->info == NULL) {
 		ret = -ENODEV;
 		goto out_unlock;
-- 
1.8.0