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authorGreg Kroah-Hartman <gregkh@suse.de>2008-05-15 22:44:08 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2008-05-20 22:31:53 +0200
commit8b485877e0b9eb23c3579f50cca165f75442c6cc (patch)
tree709b03e7436df3895bf49868ec3de8d2078d281a /drivers/video/display/display-sysfs.c
parentmm: bdi: fix race in bdi_class device creation (diff)
downloadlinux-8b485877e0b9eb23c3579f50cca165f75442c6cc.tar.xz
linux-8b485877e0b9eb23c3579f50cca165f75442c6cc.zip
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: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/video/display/display-sysfs.c')
-rw-r--r--drivers/video/display/display-sysfs.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/video/display/display-sysfs.c b/drivers/video/display/display-sysfs.c
index 35477177bef4..6ef800bdf482 100644
--- a/drivers/video/display/display-sysfs.c
+++ b/drivers/video/display/display-sysfs.c
@@ -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);