Commit 8b485877 authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman

fbdev: 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: James Simmons <jsimmons@infradead.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 19051c50
......@@ -26,6 +26,7 @@
#include <linux/ctype.h>
#include <linux/idr.h>
#include <linux/err.h>
#include <linux/kdev_t.h>
static ssize_t display_show_name(struct device *dev,
struct device_attribute *attr, char *buf)
......@@ -152,10 +153,13 @@ struct display_device *display_device_register(struct display_driver *driver,
mutex_unlock(&allocated_dsp_lock);
if (!ret) {
new_dev->dev = device_create(display_class, parent, 0,
"display%d", new_dev->idx);
new_dev->dev = device_create_drvdata(display_class,
parent,
MKDEV(0,0),
new_dev,
"display%d",
new_dev->idx);
if (!IS_ERR(new_dev->dev)) {
dev_set_drvdata(new_dev->dev, new_dev);
new_dev->parent = parent;
new_dev->driver = driver;
mutex_init(&new_dev->lock);
......
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