[PATCH 08/13] UIO: fix race in device_create

From: Greg Kroah-Hartman
Date: Tue May 20 2008 - 18:39:52 EST

There is a race from when a device is created with device_create() and
then the drvdata is set with a call to dev_set_drvdata() in which a
sysfs file could be open, yet the drvdata will be NULL, causing all
sorts of bad things to happen.

This patch fixes the problem by using the new function,

Cc: Kay Sievers <kay.sievers@xxxxxxxx>
Cc: Hans J. Koch <hjk@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
drivers/uio/uio.c | 7 +++----
1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 55cc7b8..0a12e90 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -649,15 +649,14 @@ int __uio_register_device(struct module *owner,
if (ret)
goto err_get_minor;

- idev->dev = device_create(uio_class->class, parent,
- MKDEV(uio_major, idev->minor),
- "uio%d", idev->minor);
+ idev->dev = device_create_drvdata(uio_class->class, parent,
+ MKDEV(uio_major, idev->minor), idev,
+ "uio%d", idev->minor);
if (IS_ERR(idev->dev)) {
printk(KERN_ERR "UIO: device register failed\n");
ret = PTR_ERR(idev->dev);
goto err_device_create;
- dev_set_drvdata(idev->dev, idev);

ret = uio_dev_add_attributes(idev);
if (ret)

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