drm_read(): get rid of pointless access_ok()

address is passed only to copy_to_user()

Signed-off-by: Al Viro <[email protected]>

Author: Al Viro

drivers/gpu/drm/drm_file.c

@@ -569,9 +569,6 @@ ssize_t drm_read(struct file *filp, char __user *buffer,
 	struct drm_device *dev = file_priv->minor->dev;
 	ssize_t ret;
 
-	if (!access_ok(buffer, count))
-		return -EFAULT;
-
 	ret = mutex_lock_interruptible(&file_priv->event_read_lock);
 	if (ret)
 		return ret;