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@xxxxxxxxxx>
---
drivers/iio/industrialio-buffer.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 8ceaaaf..2b36cea 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -673,9 +673,21 @@ 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)
+ return 0;
+
if (indio_dev->info == NULL)
return -ENODEV;
--
1.8.0
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