From 3909fab5a8afdf8f0c9191e3a2660230ef0ef724 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Fri, 4 Oct 2013 12:07:00 +0100 Subject: [PATCH] iio:buffer: Ignore noop requests for iio_update_buffers() 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 Signed-off-by: Jonathan Cameron --- 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 d12b384..796376a 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -664,9 +664,23 @@ 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; -- 2.7.4