[PATCH 22/44] driver core: let dev_set_drvdata return int instead of void as it can fail

From: Greg Kroah-Hartman
Date: Thu May 19 2011 - 20:11:48 EST

From: Uwe Kleine-KÃnig <u.kleine-koenig@xxxxxxxxxxxxxx>

Before commit

b402843 (Driver core: move dev_get/set_drvdata to drivers/base/dd.c)

calling dev_set_drvdata with dev=NULL was an unchecked error. After some
discussion about what to return in this case removing the check (and so
producing a null pointer exception) seems fine.

Signed-off-by: Uwe Kleine-KÃnig <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
drivers/base/dd.c | 7 +++----
include/linux/device.h | 2 +-
2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 7e9219b..e3a3eff 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -413,17 +413,16 @@ void *dev_get_drvdata(const struct device *dev)

-void dev_set_drvdata(struct device *dev, void *data)
+int dev_set_drvdata(struct device *dev, void *data)
int error;

- if (!dev)
- return;
if (!dev->p) {
error = device_private_init(dev);
if (error)
- return;
+ return error;
dev->p->driver_data = data;
+ return 0;
diff --git a/include/linux/device.h b/include/linux/device.h
index 350ceda..2215d01 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -557,7 +557,7 @@ 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

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