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| author | Greg Kroah-Hartman <gregkh@suse.de> | 2008-05-15 22:44:08 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-05-20 22:31:53 +0200 |
| commit | 8b485877e0b9eb23c3579f50cca165f75442c6cc (patch) | |
| tree | 709b03e7436df3895bf49868ec3de8d2078d281a /drivers/video/display | |
| parent | mm: bdi: fix race in bdi_class device creation (diff) | |
| download | linux-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')
| -rw-r--r-- | drivers/video/display/display-sysfs.c | 10 |
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); |