linux-kernel - [PATCH 5/5] driver core: let dev_set_drvdata return int instead of void as it can fail

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Date:	Wed,  6 Apr 2011 11:24:25 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, kernel@...gutronix.de,
	Viresh Kumar <viresh.kumar@...com>,
	linux-arm-kernel@...ts.infradead.org, shiraz.hashim@...com
Subject: [PATCH 5/5] driver core: let dev_set_drvdata return int instead of void as it can fail

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
Hello,

I wasn't sure what to return when dev_set_drvdata is called with
dev=NULL.  I choosed 0, but -EINVAL would be OK for me, too. What do you
think?

And we could add __must_check, maybe do this later =:-)

Best regards
Uwe

 drivers/base/dd.c      |    8 +++++---
 include/linux/device.h |    2 +-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index da57ee9..29ff339 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -408,17 +408,19 @@ void *dev_get_drvdata(const struct device *dev)
 }
 EXPORT_SYMBOL(dev_get_drvdata);
 
-void dev_set_drvdata(struct device *dev, void *data)
+int dev_set_drvdata(struct device *dev, void *data)
 {
 	int error;
 
 	if (!dev)
-		return;
+		return 0;
+
 	if (!dev->p) {
 		error = device_private_init(dev);
 		if (error)
-			return;
+			return error;
 	}
 	dev->p->driver_data = data;
+	return 0;
 }
 EXPORT_SYMBOL(dev_set_drvdata);
diff --git a/include/linux/device.h b/include/linux/device.h
index 1bf5cf0..9e754c7 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -558,7 +558,7 @@ extern int device_move(struct device *dev, struct device *new_parent,
 extern const char *device_get_devnode(struct device *dev,
 				      mode_t *mode, const char **tmp);
 extern void *dev_get_drvdata(const struct device *dev);
-extern void dev_set_drvdata(struct device *dev, void *data);
+extern int dev_set_drvdata(struct device *dev, void *data);
 
 /*
  * Root device objects for grouping under /sys/devices
-- 
1.7.2.3

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