linux-kernel - [PATCH v2 02/16] i3c: move dev_to_i3cdev() to use container_of

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Date:   Wed, 11 Jan 2023 12:30:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-i3c@...ts.infradead.org
Subject: [PATCH v2 02/16] i3c: move dev_to_i3cdev() to use container_of_const()

The driver core is changing to pass some pointers as const, so move
dev_to_i3cdev() to use container_of_const() to handle this change.
dev_to_i3cdev() now properly keeps the const-ness of the pointer passed
into it, while as before it could be lost.

Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: linux-i3c@...ts.infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/i3c/device.c       | 12 ------------
 include/linux/i3c/device.h |  9 ++++++++-
 2 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/drivers/i3c/device.c b/drivers/i3c/device.c
index 9762630b917e..d111499061b2 100644
--- a/drivers/i3c/device.c
+++ b/drivers/i3c/device.c
@@ -208,18 +208,6 @@ struct device *i3cdev_to_dev(struct i3c_device *i3cdev)
 }
 EXPORT_SYMBOL_GPL(i3cdev_to_dev);
 
-/**
- * dev_to_i3cdev() - Returns the I3C device containing @dev
- * @dev: device object
- *
- * Return: a pointer to an I3C device object.
- */
-struct i3c_device *dev_to_i3cdev(struct device *dev)
-{
-	return container_of(dev, struct i3c_device, dev);
-}
-EXPORT_SYMBOL_GPL(dev_to_i3cdev);
-
 /**
  * i3c_device_match_id() - Returns the i3c_device_id entry matching @i3cdev
  * @i3cdev: I3C device
diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h
index 1c997abe868c..68b558929aec 100644
--- a/include/linux/i3c/device.h
+++ b/include/linux/i3c/device.h
@@ -186,7 +186,14 @@ static inline struct i3c_driver *drv_to_i3cdrv(struct device_driver *drv)
 }
 
 struct device *i3cdev_to_dev(struct i3c_device *i3cdev);
-struct i3c_device *dev_to_i3cdev(struct device *dev);
+
+/**
+ * dev_to_i3cdev() - Returns the I3C device containing @dev
+ * @dev: device object
+ *
+ * Return: a pointer to an I3C device object.
+ */
+#define dev_to_i3cdev(__dev)	container_of_const(__dev, struct i3c_device, dev)
 
 const struct i3c_device_id *
 i3c_device_match_id(struct i3c_device *i3cdev,
-- 
2.39.0