linux-kernel - [RESEND PATCH 3/4] mcb: Introduce type safety for to_mcb

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Date:   Fri, 26 Aug 2016 09:34:59 +0200
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Andreas Werner <andreas.werner@....de>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Johannes Thumshirn <jthumshirn@...e.de>
Subject: [RESEND PATCH 3/4] mcb: Introduce type safety for to_mcb_*

The to_mcb_{bus,device,driver}() macros lacked type safety, so convert them to
inline functions to enforce compile time type checking.

Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
---
 include/linux/mcb.h | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/include/linux/mcb.h b/include/linux/mcb.h
index ead13d2..a6733d3 100644
--- a/include/linux/mcb.h
+++ b/include/linux/mcb.h
@@ -41,7 +41,11 @@ struct mcb_bus {
 	char name[CHAMELEON_FILENAME_LEN + 1];
 	int (*get_irq)(struct mcb_device *dev);
 };
-#define to_mcb_bus(b) container_of((b), struct mcb_bus, dev)
+
+static inline struct mcb_bus *to_mcb_bus(struct device *dev)
+{
+	return container_of(dev, struct mcb_bus, dev);
+}
 
 /**
  * struct mcb_device - MEN Chameleon Bus device
@@ -77,7 +81,11 @@ struct mcb_device {
 	struct resource irq;
 	struct resource mem;
 };
-#define to_mcb_device(x) container_of((x), struct mcb_device, dev)
+
+static inline struct mcb_device *to_mcb_device(struct device *dev)
+{
+	return container_of(dev, struct mcb_device, dev);
+}
 
 /**
  * struct mcb_driver - MEN Chameleon Bus device driver
@@ -95,7 +103,11 @@ struct mcb_driver {
 	void (*remove)(struct mcb_device *mdev);
 	void (*shutdown)(struct mcb_device *mdev);
 };
-#define to_mcb_driver(x) container_of((x), struct mcb_driver, driver)
+
+static inline struct mcb_driver *to_mcb_driver(struct device_driver *drv)
+{
+	return container_of(drv, struct mcb_driver, driver);
+}
 
 static inline void *mcb_get_drvdata(struct mcb_device *dev)
 {
-- 
2.9.3