uio: Don't clear driver data

Currently uio sets it's driver data to NULL just as it is unregistering
attributes.  sysfs maks the guaranatee that it will not call attributes
after device_destroy is called so this is unncessary and leads to lots
of unnecessary code in uio.c

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Hans J. Koch <hjk@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 14 deletions

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index bc774cce0a4d..8132288920b2 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -229,10 +229,7 @@ static ssize_t show_name(struct device *dev,
                          struct device_attribute *attr, char *buf)
 {
         struct uio_device *idev = dev_get_drvdata(dev);
-        if (idev)
-                return sprintf(buf, "%s\n", idev->info->name);
-        else
-                return -ENODEV;
+        return sprintf(buf, "%s\n", idev->info->name);
 }
 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 
@@ -240,10 +237,7 @@ static ssize_t show_version(struct device *dev,
                             struct device_attribute *attr, char *buf)
 {
         struct uio_device *idev = dev_get_drvdata(dev);
-        if (idev)
-                return sprintf(buf, "%s\n", idev->info->version);
-        else
-                return -ENODEV;
+        return sprintf(buf, "%s\n", idev->info->version);
 }
 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
 
@@ -251,11 +245,7 @@ static ssize_t show_event(struct device *dev,
                           struct device_attribute *attr, char *buf)
 {
         struct uio_device *idev = dev_get_drvdata(dev);
-        if (idev)
-                return sprintf(buf, "%u\n",
-                                (unsigned int)atomic_read(&idev->event));
-        else
-                return -ENODEV;
+        return sprintf(buf, "%u\n", (unsigned int)atomic_read(&idev->event));
 }
 static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
 
@@ -878,7 +868,6 @@ void uio_unregister_device(struct uio_info *info)
 
         uio_dev_del_attributes(idev);
 
-        dev_set_drvdata(idev->dev, NULL);
         device_destroy(uio_class, MKDEV(uio_major, idev->minor));
         kfree(idev);