iio: Wakeup poll and blocking reads when the device is unregistered

Once the device has been unregistered there won't be any new data no matter how
long a userspace application waits, so we might as well wake them up and let
them know.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index a019a7b424cb..dc24a9b3d325 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1139,6 +1139,10 @@ void iio_device_unregister(struct iio_dev *indio_dev)
         iio_disable_all_buffers(indio_dev);
 
         indio_dev->info = NULL;
+
+        iio_device_wakeup_eventset(indio_dev);
+        iio_buffer_wakeup_poll(indio_dev);
+
         mutex_unlock(&indio_dev->info_exist_lock);
 }
 EXPORT_SYMBOL(iio_device_unregister);