Commit c5fb920a authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman

s390: fix race in device_create

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,
device_create_drvdata().

Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 5d99a8b8
......@@ -762,10 +762,10 @@ static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv)
device_unregister(dev);
return ret;
}
priv->class_device = device_create(vmlogrdr_class, dev,
MKDEV(vmlogrdr_major,
priv->minor_num),
"%s", dev->bus_id);
priv->class_device = device_create_drvdata(vmlogrdr_class, dev,
MKDEV(vmlogrdr_major,
priv->minor_num),
priv, "%s", dev->bus_id);
if (IS_ERR(priv->class_device)) {
ret = PTR_ERR(priv->class_device);
priv->class_device=NULL;
......@@ -773,7 +773,6 @@ static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv)
device_unregister(dev);
return ret;
}
dev->driver_data = priv;
priv->device = dev;
return 0;
}
......
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