linux-kernel - [PATCH v5 03/17] iio: core-trigger: make iio_device_register_trigger

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Date:   Thu, 11 Feb 2021 14:24:38 +0200
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-kernel@...r.kernel.org>, <linux-iio@...r.kernel.org>
CC:     <lars@...afoo.de>, <Michael.Hennerich@...log.com>,
        <jic23@...nel.org>, <nuno.sa@...log.com>,
        <dragos.bogdan@...log.com>, <rafael@...nel.org>,
        <gregkh@...uxfoundation.org>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH v5 03/17] iio: core-trigger: make iio_device_register_trigger_consumer() an int return

Oddly enough the noop function is an int-return. This one seems to be void.
This change converts it to int, because we want to change how groups are
registered. With that change this function could error out with -ENOMEM.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/iio/iio_core_trigger.h     | 4 +++-
 drivers/iio/industrialio-trigger.c | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/iio_core_trigger.h b/drivers/iio/iio_core_trigger.h
index 374816bc3e73..e1a56824e07f 100644
--- a/drivers/iio/iio_core_trigger.h
+++ b/drivers/iio/iio_core_trigger.h
@@ -9,8 +9,10 @@
 /**
  * iio_device_register_trigger_consumer() - set up an iio_dev to use triggers
  * @indio_dev: iio_dev associated with the device that will consume the trigger
+ *
+ * Return 0 if successful, negative otherwise
  **/
-void iio_device_register_trigger_consumer(struct iio_dev *indio_dev);
+int iio_device_register_trigger_consumer(struct iio_dev *indio_dev);
 
 /**
  * iio_device_unregister_trigger_consumer() - reverse the registration process
diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
index ea3c9859b258..438d5012e8b8 100644
--- a/drivers/iio/industrialio-trigger.c
+++ b/drivers/iio/industrialio-trigger.c
@@ -692,10 +692,12 @@ int iio_trigger_validate_own_device(struct iio_trigger *trig,
 }
 EXPORT_SYMBOL(iio_trigger_validate_own_device);
 
-void iio_device_register_trigger_consumer(struct iio_dev *indio_dev)
+int iio_device_register_trigger_consumer(struct iio_dev *indio_dev)
 {
 	indio_dev->groups[indio_dev->groupcounter++] =
 		&iio_trigger_consumer_attr_group;
+
+	return 0;
 }
 
 void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev)
-- 
2.17.1